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Chemistry is the branch of science that studies the properties and behavior of matter, the changes it undergoes during chemical reactions, and the energy that accompanies those processes.

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Discover Frequently Asked Chemistry Questions and Their Answers

• Find the partial pressure in a solution containing ethanol and 1-propanol with a total vapor pressure of #"56.3 torr"#? The pure vapor pressures are #"100.0 torr"# and #"37.6 torr"#, respectively, and the solution has a mol fraction of #0.300# of ethanol.
• What volume does 4.05 mol #C_6H_12O_6# occupy at STP?
• How many grams of phosgenite can be obtained from 13.0 g of #PbO# and 13.0 g #NaCl# in the presence of excess water and #CO_2#?
• Why does antifreeze also raise the boiling point of water?
• The atmospheric pressure at the summit of Mt. Everest is 255 torr. The percentage of #O_2# and #N_2# is 20% and 79%, respectively. How many #N_2# and #O_2# molecules are there in a volume of 10.0L at 12°C?
• The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens to the pressure of the gas?
• What is the stoichiometric ratio between sodium carbonate and carbon dioxide?
• Explain the role of Van der Waals forces in pvc plastic?
• After burning 6.08g of silicon and carbon mixture, 8.4g of solid product was produced. The gaseous product was let through a 100mL 15% NaOH solution (density = 1.1g/cm^3). What was the silicon and carbon composition in grams?
• What is the difference in the boiling points of #O_2# and #O_3# at standard pressure in terms of intermolecular forces?
• What is the functional group of alkane and alkene?
• Why do we use alcoholic base baths for cleaning glassware?
• How are aldehydes and ketones similar?
• What are the isomers of C3H6O?
• Is Williamson Ether Synthesis reversible?
• What is the trivial name of #"H"_3"CC(=O)H"#?
• What is the representation of butanone?
• What are some examples of minor resonance structures?
• How many pi bonds can the atom form?
• How can I raw dots-and-crosses diagrams (showing outer electrons only) for ammonia, #NH_3#?

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Chemistry Help and Problems

In our chemistry help section, you’ll find a broad range of topics from very basic chemistry all the way through

some more advanced organic chemistry topics. Browse our chemistry topics below, or contact one of our chemistry tutors for private help.

Before you get into the other topics, learning HOW to learn chemistry is a great place to start, and this section will help.

Numbers and Math Operations

What math do you need know for chemistry? This section illuminates those specific operations.

Units, Measures, & Dimensions

Take a look at all the various types of measures and units you need to understand chemistry.

Atomic Structure

Need to understand how atoms are structured? Get started here.

The Periodic Table

Almost everyone has heard of the periodic table, but do you know how to read it? This section gives you a thorough

history of the periodic table, and explains how elements are divided and grouped in the table.

Take a deep dive on every element on the periodic table.

Mixtures and solutions may seem to have a lot in common, but they’re actually very different. Find out more here.

States of Matter

Matter has a variety of different states, ranging from gases to solids. Learn more about them in this section.

What are the different bonds and how do you create a compound? Get some clarity in this thorough section.

Let’s learn more about writing simple chemical equations and types of reactions. We cover a lot of ground here.

Moles and Percents

What are moles and why do we need them? No, not the animal – although those are great too!

Basic Stoichiometry

What is stoichiometry and what forms does it take? This section goes into detail.

Redox and Electroplating

Let’s go further into electrochemistry and redox reactions.

What are gases and the laws that govern them? We take a look here.

Acids and Bases

What makes an acid or a base weak or strong? What are acids and bases in the first place? Let’s dig in.

Polyatomic Ions

Polyatomic ions are ions with many atoms; they contain more than one element. They are charged just like regular

ions; for example, an ion looks like this: Cl – , while a polyatomic ion looks like this:

ClO 3 – . While the chloride ion only contains one element – chlorine – the chlorate ion contains

both chlorine and oxygen. Read this lesson for examples of other commonly known polyatomic ions.

Electronegativity

Electronegativity is a property of atoms that has to do with the tendency to attract electrons from another atom to

form an ionic bond. Electronegativity is measured using the Pauling scale, which was instated by Linus Pauling. Read

this lesson to find out all about electronegativity!

Endothermic and Exothermic Reactions

All reactions can be classified as endothermic (storing energy) or exothermic (releasing energy). This lesson

reviews the ways in which reactions store and give off energy, including items like heat, light, and mechanical energy.

Once you’ve read this lesson, test yourself with a quick practice quiz to review the endothermic and exothermic

Hydrolysis occurs when one adds water to a compound, which causes the compound to break apart into a cation and an

anion. Then, water can bond chemically with the substance, changing its chemical form.These reactions often take place

when ionic compounds dissolve in water. Read on to learn more about the process of hydrolysis!

Dynamic Equilibrium

When a reaction is in a state of dynamic equilibrium, the reaction is reversible. This means that, to maintain

equilibrium, the products break apart to form the reactants. Read this lesson for more information on dynamic

equilibrium!

Enthalpy is a state function that is measured in kilojoules per mole. Enthalpy is abbreviated as H in the

Gibbs free energy equation: G = H – TS. Enthalpy can help an observer discern whether a reaction is endothermic or

exothermic based on the enthalpy having a positive or negative value. Read on to find out more about enthalpy!

Like enthalpy, entropy is also a state function that is defined as ΔS , or S f –

S i . It is a spontaneous reaction that occurs naturally. Entropy measures the disorder of a system. Read this

lesson to learn more about entropy!

Mass Spectrometry

Mass spectrometry is used to experimentally determine the molecular weight of a sample by ionizing a molecule and

passing it through electrical and magnetic fields. The observer would then note how the ionized compound responds,

which correlates with the molecular weight in a quantifiable way. Read on to learn more about the intricate process of

mass spectrometry!

Hess’s Law

Hess’s law is much like solving a puzzle using the change in entropy of a reaction. The result is that one can tell

the change in energy (in kJ/mol) of a reaction. Hess’s law requires a balanced equation with proper coefficients. Read

on for more advice on implementing Hess’s law!

Born-Haber Cycle

The Born-Haber cycle is a series of chemical processes that are used to calculate the lattice energy of ionic

solids. The Born-Haber cycle can be thought of as a special case of Hess’s law. Read on for a definition of lattice

energy as well as examples of how the Born-Haber cycle is used to calculate lattice energy.

This page identifies different types of bonds, including covalent, polar covalent, ionic, and hydrogen. It explains

how to draw compound structures by counting electrons and placing bonds accordingly. The Octet and Duet rules are also

explained here.

Electron Configuration

This page details how electrons are arranged in an atom, including information about the orbitals (s, p, d, and f)

and how to easily tell which orbital an electron is in. You’ll also learn about the diagonal rule and electron

Electron Delocalization

Electron delocalization can be really confusing! In order to understand this concept, one must learn about

resonance, bonding, and aromaticity. Read on for more information about electron delocalization!

Aufbau Principle

The Aufbau principle describes how electrons fill energy levels in an atom. In order to write the electron

configuration of an atom, one must know how the subshells fill. Using the diagonal rule will certainly help with this

process. Read on for more information about the Aufbau principle.

Orbital Hybridization

Hybridization occurs when two atomic orbitals combine to form one hybrid orbital. One of the more common types of

hybridization is sp 3 hybridization, which is described in detail in this lesson. Read on for more detailed

information on the intricacies of electron orbitals.

Electrolysis

Electrolysis occurs in electrolytic cells when an electrical current causes a nonspontaneous oxidation-reduction

reaction. This lesson describes how electrolysis is used, including extracting pure metals from the Earth’s crust. Read

on for more information on the process of electrolysis!

Voltaic Cells

Voltaic cells use chemical energy to do electrical work. A redox reaction occurs, and the electrons are forced

through an electrical circuit. Read on to find out the specifics on how voltaic cells power electrical processes!

Radiation Chemistry

The study of nuclear reactions is called radiation chemistry. A nuclear reaction involves the nucleus of an atom.

These types of processes were first discovered by Marie Curie in the late 1800s. Read on for more details about

radiation chemistry!

Introduction to Organic Chemistry

Introduces carbon structures and interactions between molecules. Basic vocabulary and ideas are introduced

concerning alcohols and hydrocarbons. Combustion of a hydrocarbon is also discussed briefly.

Alkanes and Alkenes

Alkanes and alkenes are both hydrocarbons that follow the standard nomenclature procedures. Learn whether alkanes

and alkenes are saturated or unsaturated, which is more reactive, and how to name a compound by looking at its

structure in this lesson.

Aromatic Electrophilic Substitutions (EArS Reactions)

When aromatic compounds undergo reactions with electrophiles, a substitution reaction occurs. This reaction is known

as an electrophilic aromatic substitution (EArS or EAS) reaction. Read on for an in-depth description of how these

reactions occur!

Halogenoalkanes

Halogenoalkanes are exciting because, compared to alkanes, they are very highly reactive when paired with

nucleophiles or bases. Halogenoalkanes are also SP3 hybridized. Read this lesson to find out more information on

halogenoalkanes!

Carbonyl Condensation Reactions

A carbonyl condensation reaction occurs between two carbonyl partners and involve nucleophilic addition and α

substitution. This lesson also covers aldol condensation as well as the Robinson annulation reaction. Read on for more

details about these chemical processes.

Elimination Reactions

An elimination reaction occurs when a starting product breaks down into two new products that contain all the atoms

of the original reactant. There are two types: E1 and E2. Read this lesson for more information about elimination

Nucleophilic Substitution Reactions

Nucleophilic substitution reactions occur when a nucleophile interacts with an electrophile. Read this lesson for a

step by step explanation of what happens during a nucleophilic substitution reaction.

This lesson also covers nucleophilic substitution including the SN1 and SN2 mechanisms. Effects on kinetic rate,

alkyl group, and more are discussed in this lesson.

Cyclohexane Rings

Because many students cannot and do not draw organic structures correctly, one of our most prominent chemistry

tutors took the time to explain how to draw cyclohexane rings in great detail. She even shows more than one way to get

a perfect drawing of this ring. Read the lesson to find out how to draw these rings correctly!

Stereoisomers

Stereoisomers are a category of isomers. Learn about the different categories of isomers in this lesson, and how you will study stereoisomers in chemistry and biochemistry.

Content in this section of Wyzant Lessons has been curated by tutors, as well as by Chemtutor.com creator David Wilner.

David Wilner is a native of Georgia, USA, born just before the end of WWII. Mr. Wilner is happiest when he is explaining things in science (pontificating), so it is natural that he has been a science teacher in high school and a teacher of chemistry at Georgia Perimeter College.

Still need help after using our chemistry resources? Use our service to find a chemistry tutor .

• Wait, so does an object itself actually physically do something when light is reflected or refracted on the item to show the item color? Like for instance a red ball?
• Solving for a reaction in solution
• A water sample contains 5 mg SO42- per liter. What is the concentration in micromoles/L?
• In esterification RCOOH reacts with ROH in the presence of an acid giving H+. Why does H+ react with RCOOH when it is a better acid than ROH? Shouldnt H+ react with the better base??

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Chemistry Worksheets

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Chemistry Worksheets and Handouts (PDF for Printing)

This is a collection of free chemistry worksheets and handouts to print. Most of the printables are PDF files, although some are available as JPG or PNG files. All of these worksheets print cleanly on normal printer paper, plus you can resize them to fit your needs.

Here is a list of worksheets. This site also has articles explaining these topics in detail.

• Label Parts of the Atom [ Google Apps worksheet ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]
• Acid formulas [ PDF ][ Answers ]
• Balancing equations Worksheet #1 [ PDF ][ Answers ] Worksheet #2 [ PDF ][ Answers ] Worksheet #3 [ PDF ][ Answers ] Worksheet #4 [ PDF ][ Answers ]
• Chemical and Physical Changes [ PDF ][ Answers ]
• Chemistry scavenger hunt [ PDF clues ][ Answers ]
• Element names crossword [ PDF ][ Answers ]
• Element symbols – Symbols that make words [ PDF worksheet ][ Answers ]
• Element symbols – Countries of the world [ PDF ][ Answers ]
• More element symbol worksheets
• Homogeneous or Heterogeneous Mixtures [ PDF ][ Answers ]
• Intensive and Extensive Properties [ Worksheet ][ Answer Key ]
• Intrinsic and Extrinsic Properties [ PDF ][ Answers ]
• Ionic and Covalent Compounds (Names and Identification) [ PDF Worksheet ][ Answer Key ]
• Ionic Compound Names and Formulas [ PDF Worksheet ][ Answer Key ]
• Metric to English Unit Conversions [ PDF Worksheet ][ Answer Key ]
• Mixtures [ PDF ][ Answers ]
• Periodic table scavenger hunt [ PDF clues ][ Answers ]
• Reading a meniscus [ PDF ][ Answers ]
• Reading periodic table element information Worksheet #1 [ PDF ][ Answers ] Worksheet #2 [ PDF ][ Answers ]
• Scientific Notation [ PDF ][ Answers ]
• Significant digits Rules [ PDF ][ Answers ] Addition and subtraction [ PDF ][ Answers ] Multiplication and division [ PDF ][ Answers ]
• Types of Chemical Reactions [ Worksheet ][ Answers ]

In addition to these chemistry worksheets, there is a collection of word search puzzles .

Chemistry Handouts

These chemistry handouts illustrate chemistry concepts and offer examples.

• Amino acid side chains [ PDF ]
• Antimatter examples [ PNG ]
• Atom facts [ PNG ]
• Chemical properties [ JPG ]
• Colligative properties [ JPG ]
• Electron configurations [ PDF ]
• Element electronegativities [ PDF ]
• 118 Element Flash Cards [ PDF ]
• Element list [ PDF ]
• Endothermic reactions [ PNG ]
• Error calculations [ JPG ]
• Exothermic reactions [ JPG ]
• Heterogeneous mixtures [ JPG ]
• Hydrocarbon prefixes [ JPG ]
• Ionic compound properties [ PNG ]
• Genetic codons [ PDF ]
• Lewis structures [ JPG ]
• Litmus test [ PNG ]
• Magnetic vs non-magnetic metals [ JPG ]
• Mole ratio [ JPG ]
• Organic vs inorganic [ JPG ]
• Oxidation numbers [ JPG ]
• Periodic table Bingo game [ PDF ]
• pH indicators [ PNG ]
• Physical change [ JPG ]
• Physical properties [JPG ]
• Noble metals [ JPG ]
• Reactants and products [ JPG ]
• RNA vs DNA [ JPG ]
• States of matter [ JPG ]
• Visible spectrum [ JPG ]

Periodic Tables

There’s a printable periodic table for just about any purpose, but some of the most popular are listed here.

• 118 element vibrant periodic table [ PNG ]
• Actinides [ JPG ]
• Blank periodic table [ PDF ]
• Element charges [ JPG ]
• Element density [ PDF ]
• Element electrical conductivity [ PDF ]
• Element state of matter [ PDF ]
• Muted color 118 element periodic table [ PDF ]
• Native elements [ JPG ]
• Valence [ JPG ]

Biology Worksheets and Handouts

Is biology more your thing? We’ve got similar resources for the life sciences, including biology, biochemistry, cell biology, and anatomy.

Chemistry Worksheets Terms of Use

You are welcome to print these resources for personal or classroom use. They may be used as handouts or posters. They may not be posted elsewhere online, sold, or used on products for sale.

This page doesn’t include all of the assets on the Science Notes site. If there’s a table or worksheet you need but don’t see, just let us know!

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Building engaging classroom activities has never been easier. Aktiv Chemistry provides an extensive library of questions for chemistry courses such as General Chemistry, Introductory Chemistry, GOB Chemistry, Organic Chemistry. The content library includes discipline-specific problem types such as molecule drawing, chemical equations and naming, dimensional analysis, numerical entry, and more.

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Draw the Lewis structure of (CHO)OCH₃ and then choose the appropriate set of molecular geometries of the three central atoms. Your answer choice is independent of the orientation of your drawn structure.

The solubility of He in water at 25.0 °C is 7.0 × 10⁻⁵ M when the partial pressure of He is 0.20 atm. What is the value of the Henry's law constant for He ?

• monosaccharide
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• heteropolysaccharide
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According to the balanced reaction below, calculate the moles of NH₃ that form when 4.2 mol of N₂H₄ completely reacts 3 N₂H₄(l) → 4 NH₃(g) + N₂(g)

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Drawing chemical structures, entering subscripts and superscripts, and working with significant figures just shouldn’t be hard. That’s why  Aktiv Chemistry  was designed from the ground up with the student experience in mind. With intuitive user interfaces and scaffolded and visual modules, our goal is to use technology to lower the barrier to chemistry.

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Aktiv Chemistry ’s mobile-first design ensures that students receive the same experience no matter where they are. Students take advantage of the  Aktiv Learning  mobile app to work and study on-the-go in places like riding the bus or train, or even on campus when they have downtime.

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Aktiv Chemistry offers additional security with both Question Pools and Algorithmic Problems. These features randomize the content that is delivered to each student during homeworks, quizzes, or exams. Instructors can also randomize the order of questions on any assignment.

Built-in variables create thousands of question variants to be delivered that randomize numbers, words, or compounds within the problem statement.

Group together a set of similar questions and deliver a subset of them at random to students.

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What is the correct IUPAC name for HBrO(aq)?

What is the correct IUPAC name for Ca(BrO₂)₂?

What is the correct IUPAC name for Ti(ClO₄)₄?

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Every Aktiv Chemistry activity has a multitude of grading policies that can be customized depending on the assignment type. Settings include points per problem, participation credit, late submissions with penalties, variable attempts per problem, penalties for incorrect attempts, and more. The Aktiv Chemistry gradebook can be set up to display summary columns or individual columns depending on the assignment type as well.

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Aktiv Chemistry’s gradebook can be synced with any popular campus LMS such as Canvas, Blackboard, Moodle, or D2L. The gradebook and associated columns can be customized to separate the various assignment types, to present individual assignments, or display summary columns for each type.

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2.15: Assignment—Atoms, Molecules, and Ions

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To download a copy of the assignment, please click on the link Sample Questions .

As you work these matter and measurement problems, consider and explain:

• What type of question is it?
• How do you know what type of question it is?
• What information are you looking for?
• What information do they give?
• How will you go about solving this?
• Show how to solve the problem.
• Be able to answer for a different reaction, number, set of conditions, etc.

Sample Questions

• NH 4 and NH 4 Cl
• ZnO 2 and ZnCl 2
• H 2 O and HCl
• NO and NO 2
• CH 4 and CO 2
• A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 70 gram sample of chemical X should contain how many grams of carbon?
• All atoms of the same element are identical.
• Compounds are combinations of different atoms.
• A chemical reaction changes the way atoms are grouped together.
• Atoms are indestructible.
• Who was the first scientist to show that atoms emit any negative particles?
• The Rutherford experiment proved the Thomson “plum-pudding” model of the atom to be essentially correct.
• The Rutherford experiment was useful in determining the nuclear charge on the atom.
• Millikan’s oil-drop experiment showed that the charge on any particle was a simple multiple of the charge on the electron.
• The electric discharge tube proved that electrons have a negative charge.
• All of the above experiments gave the results described.
• An atom is mostly empty space.
• Almost all of the mass of the atom is concentrated in the nucleus.
• The protons and neutrons in the nucleus are very tightly packed.
• The number of protons and neutrons is always the same in the neutral atom.
• All of the above statements (A–D) are true.
• The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. What does Rhenium-185 have in its nucleus?
• 20 protons and 20 neutrons
• 21 protons and 19 neutrons
• 22 neutrons and 18 protons
• 20 protons and 22 neutrons
• 21 protons and 20 neutrons
• There is twice as much mass of hydrogen as oxygen in each molecule.
• There are two hydrogen atoms and one oxygen atom per water molecule.
• There is twice as much mass of oxygen as hydrogen in each molecule.
• There are two oxygen atoms and one hydrogen atom per water molecule.
• None of these.
• K, alkali metal
• Ba, alkaline earth metal
• Ne, noble gas
• Ni, transition metal
• Calcium, Ca
• good conductors of heat
• often lustrous
• tend to gain electrons in chemical reactions
• cobalt(II) chloride
• magnesium oxide
• aluminum(III) oxide
• diphosphorus pentoxide
• All of the above names are correct
• iodine trichloride, ICl 3
• phosophorus pentoxide, P 2 O 5
• ammonia, NH 3
• sulfur hexafluoride, SF 6
• All of the above pairs are correct.
• How many oxygen atoms are there in one formula unit of Ca 2+ ?
• What is the correct name for FeO?
• What is the correct name for Ca 2+ ?
• What is the correct name for V 3+ ?
• What is the subscript of barium in the formula of barium sulfate?
• What is the formula for calcium bisulfate?
• Pb(NO 3 ) 2 , lead(II) nitrate
• NH 4 ClO 4 , ammonium perchlorate
• PO 4 3− , phosphate ion
• Mg(OH) 2 , magnesium hydroxide
• NO 3− , nitrite ion

[reveal-answer q=”279540″]Show Sample Answers[/reveal-answer] [hidden-answer a=”279540″]

• J. J. Thomson
• 75 protons, 110 neutrons
• I, IV and II, V
• 20 protons, 20 neutrons, and 18 electrons
• 19 p, 20 n, 18 e
• iron(II) oxide
• calcium ion
• vanadium(III) ion
• Ca(HSO 4 ) 2

[/hidden-answer]

• Authored by : Jessica Garber. Provided by : Tidewater Community College. License : CC BY: Attribution

Choose Your Test

Sat / act prep online guides and tips, the 5 best homework help websites (free and paid).

Other High School , General Education

Listen: we know homework isn’t fun, but it is a good way to reinforce the ideas and concepts you’ve learned in class. But what if you’re really struggling with your homework assignments?

If you’ve looked online for a little extra help with your take-home assignments, you’ve probably stumbled across websites claiming to provide the homework help and answers students need to succeed . But can homework help sites really make a difference? And if so, which are the best homework help websites you can use? 

Below, we answer these questions and more about homework help websites–free and paid. We’ll go over: 

• The basics of homework help websites
• The cost of homework help websites 
• The five best homework websites out there 
• The pros and cons of using these websites for homework help 
• The line between “learning” and “cheating” when using online homework help 
• Tips for getting the most out of a homework help website

So let’s get started! 

The Basics About Homework Help Websites–Free and Paid

Homework help websites are designed to help you complete your homework assignments, plain and simple. 

What Makes a Homework Help Site Worth Using

Most of the best sites allow users to ask questions and then provide an answer (or multiple possible answers) and explanation in seconds. In some instances, you can even send a photo of a particular assignment or problem instead of typing the whole thing out! 

Homework help sites also offer more than just help answering homework questions. Common services provided are Q&A with experts, educational videos, lectures, practice tests and quizzes, learning modules, math solving tools, and proofreading help. Homework help sites can also provide textbook solutions (i.e. answers to problems in tons of different textbooks your school might be using), one-on-one tutoring, and peer-to-peer platforms that allow you to discuss subjects you’re learning about with your fellow students. 

And best of all, nearly all of them offer their services 24/7, including tutoring! 

What You Should Should Look Out For

When it comes to homework help, there are lots–and we mean lots –of scam sites out there willing to prey on desperate students. Before you sign up for any service, make sure you read reviews to ensure you’re working with a legitimate company. 

A word to the wise: the more a company advertises help that veers into the territory of cheating, the more likely it is to be a scam. The best homework help websites are going to help you learn the concepts you’ll need to successfully complete your homework on your own. (We’ll go over the difference between “homework help” and “cheating” a little later!) 

You don't need a golden piggy bank to use homework help websites. Some provide low or no cost help for students like you!

How Expensive Are the Best Homework Help Websites?

First of all, just because a homework help site costs money doesn’t mean it’s a good service. Likewise, just because a homework help website is free doesn’t mean the help isn’t high quality. To find the best websites, you have to take a close look at the quality and types of information they provide! 

When it comes to paid homework help services, the prices vary pretty widely depending on the amount of services you want to subscribe to. Subscriptions can cost anywhere from $2 to $150 dollars per month, with the most expensive services offering several hours of one-on-one tutoring with a subject expert per month.

The 5 Best Homework Help Websites 

So, what is the best homework help website you can use? The answer is that it depends on what you need help with. 

The best homework help websites are the ones that are reliable and help you learn the material. They don’t just provide answers to homework questions–they actually help you learn the material. 

That’s why we’ve broken down our favorite websites into categories based on who they’re best for . For instance, the best website for people struggling with math might not work for someone who needs a little extra help with science, and vice versa. 

Keep reading to find the best homework help website for you! 

Best Free Homework Help Site: Khan Academy

• Price: Free!
• Best for: Practicing tough material 

Not only is Khan Academy free, but it’s full of information and can be personalized to suit your needs. When you set up your account , you choose which courses you need to study, and Khan Academy sets up a personal dashboard of instructional videos, practice exercises, and quizzes –with both correct and incorrect answer explanations–so you can learn at your own pace. 

As an added bonus, it covers more course topics than many other homework help sites, including several AP classes.

Runner Up: Brainly.com offers a free service that allows you to type in questions and get answers and explanations from experts. The downside is that you’re limited to two answers per question and have to watch ads. 

Best Paid Homework Help Site: Chegg

• Price: $14.95 to $19.95 per month
• Best for: 24/7 homework assistance  

This service has three main parts . The first is Chegg Study, which includes textbook solutions, Q&A with subject experts, flashcards, video explanations, a math solver, and writing help. The resources are thorough, and reviewers state that Chegg answers homework questions quickly and accurately no matter when you submit them.  

Chegg also offers textbook rentals for students who need access to textbooks outside of their classroom. Finally, Chegg offers Internship and Career Advice for students who are preparing to graduate and may need a little extra help with the transition out of high school. 

Another great feature Chegg provides is a selection of free articles geared towards helping with general life skills, like coping with stress and saving money. Chegg’s learning modules are comprehensive, and they feature solutions to the problems in tons of different textbooks in a wide variety of subjects. 

Runner Up: Bartleby offers basically the same services as Chegg for $14.99 per month. The reason it didn’t rank as the best is based on customer reviews that say user questions aren’t answered quite as quickly on this site as on Chegg. Otherwise, this is also a solid choice!

Best Site for Math Homework Help: Photomath

• Price: Free (or $59.99 per year for premium services) 
• Best for: Explaining solutions to math problems

This site allows you to t ake a picture of a math problem, and instantly pulls up a step-by-step solution, as well as a detailed explanation of the concept. Photomath also includes animated videos that break down mathematical concepts to help you better understand and remember them. 

The basic service is free, but for an additional fee you can get extra study tools and learn additional strategies for solving common math problems.

Runner Up: KhanAcademy offers in-depth tutorials that cover complex math topics for free, but you won’t get the same tailored help (and answers!) that Photomath offers. 

Best Site for English Homework Help: Princeton Review Academic Tutoring

• Price: $40 to $153 per month, depending on how many hours of tutoring you want 
• Best for: Comprehensive and personalized reading and writing help 

While sites like Grammarly and Sparknotes help you by either proofreading what you write via an algorithm or providing book summaries, Princeton Review’s tutors provide in-depth help with vocabulary, literature, essay writing and development, proofreading, and reading comprehension. And unlike other services, you’ll have the chance to work with a real person to get help. 

The best part is that you can get on-demand English (and ESL) tutoring from experts 24/7. That means you can get help whenever you need it, even if you’re pulling an all-nighter! 

This is by far the most expensive homework site on this list, so you’ll need to really think about what you need out of a homework help website before you commit. One added benefit is that the subscription covers over 80 other subjects, including AP classes, which can make it a good value if you need lots of help!  

Best Site for STEM Homework Help: Studypool

• Best for: Science homework help
• Price: Varies; you’ll pay for each question you submit

When it comes to science homework help, there aren’t a ton of great resources out there. The best of the bunch is Studypool, and while it has great reviews, there are some downsides as well. 

Let’s start with the good stuff. Studypool offers an interesting twist on the homework help formula. After you create a free account, you can submit your homework help questions, and tutors will submit bids to answer your questions. You’ll be able to select the tutor–and price point–that works for you, then you’ll pay to have your homework question answered. You can also pay a small fee to access notes, lectures, and other documents that top tutors have uploaded. 

The downside to Studypool is that the pricing is not transparent . There’s no way to plan for how much your homework help will cost, especially if you have lots of questions! Additionally, it’s not clear how tutors are selected, so you’ll need to be cautious when you choose who you’d like to answer your homework questions.  

What Are the Pros and Cons of Using Homework Help Sites?

Homework help websites can be a great resource if you’re struggling in a subject, or even if you just want to make sure that you’re really learning and understanding topics and ideas that you’re interested in. But, there are some possible drawbacks if you don’t use these sites responsibly. 

We’ll go over the good–and the not-so-good–aspects of getting online homework help below. 

3 Pros of Using Homework Help Websites 

First, let’s take a look at the benefits. 

#1: Better Grades Beyond Homework

This is a big one! Getting outside help with your studies can improve your understanding of concepts that you’re learning, which translates into better grades when you take tests or write essays. 

Remember: homework is designed to help reinforce the concepts you learned in class. If you just get easy answers without learning the material behind the problems, you may not have the tools you need to be successful on your class exams…or even standardized tests you’ll need to take for college. 

#2: Convenience

One of the main reasons that online homework help is appealing is because it’s flexible and convenient. You don’t have to go to a specific tutoring center while they’re open or stay after school to speak with your teacher. Instead, you can access helpful resources wherever you can access the internet, whenever you need them.

This is especially true if you tend to study at off hours because of your extracurriculars, work schedule, or family obligations. Sites that offer 24/7 tutoring can give you the extra help you need if you can’t access the free resources that are available at your school. 

#3: Variety

Not everyone learns the same way. Maybe you’re more of a visual learner, but your teacher mostly does lectures. Or maybe you learn best by listening and taking notes, but you’re expected to learn something just from reading the textbook . 

One of the best things about online homework help is that it comes in a variety of forms. The best homework help sites offer resources for all types of learners, including videos, practice activities, and even one-on-one discussions with real-life experts. 

This variety can also be a good thing if you just don’t really resonate with the way a concept is being explained (looking at you, math textbooks!).

Not so fast. There are cons to homework help websites, too. Get to know them below!

3 Cons of Using Homework Help Websites 

Now, let’s take a look at the drawbacks of online homework help. 

#1: Unreliable Info

This can be a real problem. In addition to all the really good homework help sites, there are a whole lot of disreputable or unreliable sites out there. The fact of the matter is that some homework help sites don’t necessarily hire people who are experts in the subjects they’re talking about. In those cases, you may not be getting the accurate, up-to-date, and thorough information you need.

Additionally, even the great sites may not be able to answer all of your homework questions. This is especially true if the site uses an algorithm or chatbot to help students…or if you’re enrolled in an advanced or college-level course. In these cases, working with your teacher or school-provided tutors are probably your best option. 

#2: No Clarification

This depends on the service you use, of course. But the majority of them provide free or low-cost help through pre-recorded videos. Watching videos or reading info online can definitely help you with your homework… but you can’t ask questions or get immediate feedback if you need it .

#3: Potential For Scamming 

Like we mentioned earlier, there are a lot of homework help websites out there, and lots of them are scams. The review comments we read covered everything from outdated or wrong information, to misleading claims about the help provided, to not allowing people to cancel their service after signing up. 

No matter which site you choose to use, make sure you research and read reviews before you sign up–especially if it’s a paid service! 

When Does “Help” Become “Cheating”?

Admittedly, whether using homework help websites constitutes cheating is a bit of a grey area. For instance, is it “help” when a friend reads your essay for history class and corrects your grammar, or is it “cheating”? The truth is, not everyone agrees on when “help” crosses the line into “cheating .” When in doubt, it can be a good idea to check with your teacher to see what they think about a particular type of help you want to get. 

That said, a general rule of thumb to keep in mind is to make sure that the assignment you turn in for credit is authentically yours . It needs to demonstrate your own thoughts and your own current abilities. Remember: the point of every homework assignment is to 1) help you learn something, and 2) show what you’ve learned. 

So if a service answers questions or writes essays for you, there’s a good chance using it constitutes cheating. 

Here’s an example that might help clarify the difference for you. Brainstorming essay ideas with others or looking online for inspiration is “help” as long as you write the essay yourself. Having someone read it and give you feedback about what you need to change is also help, provided you’re the one that makes the changes later. 

But copying all or part of an essay you find online or having someone write (or rewrite) the whole thing for you would be “cheating.” The same is true for other subjects. Ultimately, if you’re not generating your own work or your own answers, it’s probably cheating.

5 Tips for Finding the Best Homework Help Websites for You

Now that you know some of our favorite homework help websites, free and paid, you can start doing some additional research on your own to decide which services might work best for you! Here are some top tips for choosing a homework help website. 

Tip 1: Decide How You Learn Best 

Before you decide which site or sites you’re going to use for homework help, y ou should figure out what kind of learning style works for you the most. Are you a visual learner? Then choose a site that uses lots of videos to help explain concepts. If you know you learn best by actually doing tasks, choose a site that provides lots of practice exercises.

Tip 2: Determine Which Subjects You Need Help With

Just because a homework help site is good overall doesn’t mean that it’s equally good for every subject. If you only need help in math, choose a site that specializes in that area. But if history is where you’re struggling, a site that specializes in math won’t be much help. So make sure to choose a site that you know provides high-quality help in the areas you need it most. 

Tip 3: Decide How Much One-On-One Help You Need 

This is really about cost-effectiveness. If you learn well on your own by reading and watching videos, a free site like Khan Academy is a good choice. But if you need actual tutoring, or to be able to ask questions and get personalized answers from experts, a paid site that provides that kind of service may be a better option.

Tip 4: Set a Budget

If you decide you want to go with a paid homework help website, set a budget first . The prices for sites vary wildly, and the cost to use them can add up quick. 

Tip 5: Read the Reviews

Finally, it’s always a good idea to read actual reviews written by the people using these homework sites. You’ll learn the good, the bad, and the ugly of what the users’ experiences have been. This is especially true if you intend to subscribe to a paid service. You’ll want to make sure that users think it’s worth the price overall!

What’s Next?

If you want to get good grades on your homework, it’s a good idea to learn how to tackle it strategically. Our expert tips will help you get the most out of each assignment…and boost your grades in the process.

Doing well on homework assignments is just one part of getting good grades. We’ll teach you everything you need to know about getting great grades in high school in this article.

Of course, test grades can make or break your GPA, too. Here are 17 expert tips that’ll help you get the most out of your study prep before you take an exam.

Ashley Sufflé Robinson has a Ph.D. in 19th Century English Literature. As a content writer for PrepScholar, Ashley is passionate about giving college-bound students the in-depth information they need to get into the school of their dreams.

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At Assignment Prime, we offer chemistry assignment help services to those students who find difficulty in writing their chemistry-related assignments. Chemistry is referred to as the scientific discipline which is concerned with the substances of which matter is composed, their properties, reactions, and use of these reactions to form new substances. Not only chemistry assignments, but we also offer top-notch guidance and assistance in writing dissertations, essays, coursework, homework, case studies, term papers, reports, etc. Our team of certified academic writers, proofreaders, editors, and quality analysts works in sync to deliver high-quality documents which score nothing less than an A+ grade.

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According to our chemistry assignment writing service providers, chemistry addresses topics such as the interaction of atoms and molecules via chemical bonds to form new chemical compounds. There are four categories of chemical bonds including covalent bonds, ionic bonds, hydrogen bonds, as well as Van der Waals force bonds. It is an essential subject of study, and it occupies an intermediate position in a hierarchy of the sciences by a reductive level between physics and biology. 

Students pursuing this subject in higher studies have to specialize in one or more of the sub-disciplines, which are:

Analytical Chemistry : It performs the analysis of material samples to gain an understanding of their structure and chemical composition.

Biochemistry : According to our chemistry assignment help experts, it is the study of chemicals, chemical interactions as well as reactions that take place in any living organism.

Inorganic chemistry : It is considered as the study of properties and reactions of inorganic compounds.

Neurochemistry : It is the study of neurochemicals including transmitters, peptides, lipids, sugars, and nucleic acids as well as their interactions and roles they play in maintaining, forming, and modifying the nervous system.

Nuclear Chemistry : It is the study of how subatomic particles come together and make nuclei. Modern Transmutation is a part component of nuclear chemistry, and the table of nuclides is a significant result and tool for this field.

Furthermore, it also includes Theoretical Chemistry, Physical Chemistry, Organic Chemistry, Astrochemistry, Green Chemistry, etc. Learning about all such core concepts as well as sub-categories of chemistry and gaining adeptness at the same is a hard nut to crack for the students who are still in their learning phase; thus they feel the need for online help with chemistry assignments.If you too share a similar fate and feel stuck due to complicated concepts related to this subject, then we have the right services for you which won’t put a burden on your budget.

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Our subject-oriented academic writers have covered almost all the essential assignment topics related to this subject. Some of the interesting concepts that we have covered previously are mentioned below:

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Are you facing problems with your chemistry homework? Trying to understand a concept or simply reviewing the fundamentals? We know that while studying chemistry, few concepts and topics become too difficult to understand for students. Also, there is not enough time in a day to complete all of one's tasks, including homework and test preparations. In addition, you need to memorize numerous equations and formulas in order to succeed. As a result, many students need chemistry homework help services.

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Chemistry is known to be a very complex subject, and completing its homework makes students exhausted and irritated. Some have the skill to get it done smoothly. However, some suffer the wrath quietly. In recent times, educational institutes have prioritized extra-curricular activities equally, which makes it more challenging for students. And this is the reason scholars have started looking for  chemistry homework help online  to get the work done on time. Let’s take a look at what general problems students go through while doing homework:

Poor Time Management

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Given how complex the chemistry course is, there are times when looking for the right information becomes challenging. Students spend much time in the laboratory creating equations. It makes chemistry homework more difficult to complete for students. To combat this situation, they hire  chemistry homework helper  with expertise in their respective fields.

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Whether you attend a college or university, the natural sciences like physics and chemistry are probably covered in your course. But, even if it's simply an introductory course and you don't want to pursue a career in science, you still need to master the fundamentals. Among which you may find: 

Organic Chemistry

Organic Chemistry is about making chemical interactions using carbon. It focuses on the composition, characteristics, and reactivity of organic compounds. Simply said, organic chemistry is challenging. But with our  online chemistry homework help , you will get quick assistance.

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Inorganic chemistry focuses on the characteristics and actions of inorganic compounds, such as minerals, water, gases, and metals. So, if all the new terminology is making your head spin, you can ask for help with chemistry homework from our professionals.

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Analytical chemistry's goal is to define the matter and quantify its abundance. Students have to use qualitative and quantitative methods to evaluate material attributes. If, at any point in time, you feel that “I need chemistry homework helper,” you can ask for assistance from our experts for this subject.

Physical Chemistry

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These are the branches for which we can provide you with prompt, practical support. However, you don’t have to enroll in any chemistry course for assistance. The last step you need to do is get in touch with our chemistry homework experts . 

Making a choice to hire a  chemistry homework helper  to sort through all these branches might save you a lot of time and stress while you pursue higher education. Moreover, we offer services in many other subjects like maths homework help , physics homework help , and many more.

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If you're a college or university student, your major education requirements might need you to take an introductory chemistry course. So, ensure that you have a firm grasp of the fundamentals of chemistry before the semester begins. It may appear straightforward at first, but there is a lot to learn. You'll cover a diverse range of topics in the chemistry course, including: 

As you can see, there are many complex topics in chemistry, and writing good homework may become difficult. However, looking at the challenges associated with this subject, our professionals offer genuine  help with chemistry homework  in all its disciplines and topics to assist students across the USA. 

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If you think, "I want to hire someone to  do my homework ." Then you do not have to feel guilty about it. Contrary to popular misconception, using websites for homework help is not considered cheating. Instead, remember that you are merely asking for assistance, as you ask your professors and teachers. 

We promise to make education for students goal-oriented, simple, efficient, and meaningful. If you are among those people who need assistance with your chemistry homework, we are here for you. Our subject specialists work hard to increase students' productivity, encourage sensible study habits, and improve their academic grades.

Finding an online resource you can rely on is crucial to excelling in your chemistry subject. This is why we want you to choose us, as we offer several benefits:

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We understand that not all students can afford these services, and some even have financial crises. Therefore, spending too much on homework help becomes unaffordable and impractical for them. However, cheap chemistry homework help  is said to be of poor-quality content. However, our service is cost-effective with satisfactory results.

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Frequently Asked Questions

Can i submit multiple chemistry homework questions at once.

Yes! You can submit an index of homework questions to our experts. It is all based on your requirement. After getting the list our writers will start working and provide you with reliable chemistry answers.

How Earliest Can You Submit My Chemistry Homework?

Our homework writers submit their documents as quickly as possible. But the period solely depends upon the student’s requirements and academic discipline. But, if you are looking for a one-day urgent submission then our team of instant writers will do it for you.

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Our homework-writing experts offer assistance in all branches of chemistry. So whether it is organic, inorganic, thermodynamics, nuclear, medicinal, theoretical or biochemistry writers got your back.

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You can visit our website and directly chat with customer support. Apart from this, you may also contact us on the official Whatsapp number and email of Global Assignment Help.

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First students need to fill out the form on the order page and list their requirements in detail. After this, to complete the payment process you can either use the debit and credit card or can submit the amount using Paypal.

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Yes, experts of Global Assignment Help can resolve all your queries instantly. All you need to do is contact our 24/7 available customer support and list down the doubt. Within a few seconds, the team will offer descriptive and accurate answers.

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The chemistry homework writers of Global Assignment Help have 15+ years of experience along with Ph.D. degrees. Thus, the experts have remarkable knowledge and use qualitative methods of research. No doubt, they will always offer you accurate solutions from a reliable source.

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Amelia Smith

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Due to personal reasons, I was not able to finish my homework in chemistry. I had to submit it in 2 days in any condition. With online homework help provided by your experts, I was able to finish my chemistry homework and submit it on time.

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Thanks to Chemistry homework helpers of Global assignment help. I was unable to complete my chemistry homework. But because of you, I could submit my homework, and my professor was impressed by my performance. They found improvement in me.

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Chemistry Assignment Help

Does Your Student Need Research Help? Use Navigate’s Alerts!

Posted in: Homepage Features

Beginning Summer 2024, instructors can raise an ad-hoc alert for students who require research assistance. When instructors submit their Library: Research Support Needed alert, a librarian will reach out to each student personally to offer services. Correspondence can be monitored on the instructor’s Navigate homepage under “Alerts.”

For students unfamiliar with library resources, a librarian can help them with:

• An orientation to the library
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For students struggling to get started on their research assignment, a librarian can help them with:

• Developing, narrowing, or broadening their research topic
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For students in a research intensive or capstone class needing help organizing their sources, a librarian can help them:

• Tracking down citations
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• Cite sources – The Center for Writing Excellence (CWE) can also help here

How the library will provide support:

• Library 101 (library resources orientation)
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• One-on-one (or small groups for group projects)
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Please reach out to [email protected] if you have any questions.

Assignment 1

• Head over to CSCI S-1b on Gradescope .
• Select Assignment 1: Computational Thinking .
• Answer all questions therein.

You won’t be able to submit the above assignment until you have confirmed you have access to the course on Gradescope. Make sure you are logging into Gradescope with your HarvardKey . If still unable to access the course and its assignments, email [email protected] ! Do not wait until the last minute to make this check, failing to turn in this assignment because you waited to check if you had Gradescope access is not something for which the course will grant an extension.

When to Do It

By 2024-06-30T23:59:00-04:00 .

How to Get Help

• Ask questions on Ed
• Attend office hours
• Email your teaching fellow

Remember that if you accidentally “Submit” your assignment before you’ve answered all of the questions, you can simply click “Resubmit” at the bottom right in Gradescope to reopen the assignment for continued editing. You may do this as often as you’d like, up until the deadline. After the regular deadline has passed, however, note that continuing to do this will begin to consume your lateness allowance, per the syllabus!

Gradescope does not maintain a revision history for written assignments, like this one. So you will only ever see your original submission timestamp, and then subsequent modifications are simply considered edits to that original submission. When you view your submission on Gradescope after submitting, what you see is exactly what we will see.

Create interactive YouTube assignments in Google Classroom more quickly and efficiently, with the help of AI

What’s changing, who’s impacted , why you’d use it , additional details , getting started .

• Admins: In order to enable the interactive questions feature, YouTube must be turned ON by administrators as an additional service for educators. This setting can be managed in the Admin console. Visit the Help Center to learn more about turning YouTube on or off for users. 
• End users:  
• If enabled by your admin, you can create or delete interactive questions for YouTube videos and grade & track interactive questions for YouTube videos.
• Suggested questions are available when you find a spark icon below the video title in the video search results. 
• Visit the Help Center to learn more about interactive questions for YouTube videos in Google Classroom. 
• Students: Students can complete a video activity regardless of whether YouTube is turned ON or OFF as an additional service. Please note that the video activity must have been created by an educator with YouTube turned ON. 

Rollout pace 

• This feature is available now. 

Availability 

• Education Plus and the Teaching & Learning Upgrade 

Resources 

• Google Workspace Admin Help: Turn YouTube on or off for users 
• Google Help: Learn about interactive questions for YouTube videos in Google Classroom 
• Google Help: Create or delete interactive questions for YouTube videos 
• Google Help: Grade and track interactive questions for YouTube videos

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• American Chemical Society
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• News Releases

ACS Publications and French consortium together support open access publishing

FOR IMMEDIATE RELEASE

WASHINGTON, June 21, 2024 — The Publications Division of the American Chemical Society (ACS) is pleased to announce it has signed a memorandum of understanding with Couperin, an academic consortium representing more than 250 universities and other educational and research institutions across France. This memorandum lays the groundwork for a new agreement covering ACS’ portfolio of hybrid journals, which combine open access (OA) and subscription-access content. 

The agreement is the first of its kind between ACS Publications and an academic consortium. In addition to granting participating institutions within the Couperin consortium full reading access to ACS journals, upon commencement the agreement will also provide authors with support for zero-embargo green OA (ZEGOA). This means that eligible corresponding authors at these institutions will be able to immediately self-archive their accepted manuscript in the repository of their choice for their articles published within ACS’ hybrid journals.  

“We're delighted to lay the groundwork for this trailblazing agreement, which has been developed in close partnership with Couperin to meet the most pressing needs of authors in France,” says ACS Publications President James Milne. “As more research funders and institutions encourage or require researchers to self-archive their accepted manuscripts, agreements of this kind will become increasingly important — and by including access to subscription content, faculty and students also benefit from unfettered access to the latest trusted research in chemistry.” 

Subject to completion of French public market procedures, the agreement between Couperin and ACS Publications is expected to commence the middle of this year and run through the end of 2026. 

The American Chemical Society (ACS) is a nonprofit organization chartered by the U.S. Congress. ACS’ mission is to advance the broader chemistry enterprise and its practitioners for the benefit of Earth and all its people. The Society is a global leader in promoting excellence in science education and providing access to chemistry-related information and research through its multiple research solutions, peer-reviewed journals, scientific conferences, eBooks and weekly news periodical Chemical & Engineering News . ACS journals are among the most cited, most trusted and most read within the scientific literature; however, ACS itself does not conduct chemical research. As a leader in scientific information solutions, its CAS division partners with global innovators to accelerate breakthroughs by curating, connecting and analyzing the world’s scientific knowledge. ACS’ main offices are in Washington, D.C., and Columbus, Ohio.

The Couperin Consortium is an association of French higher education and research establishments that aims to develop access to scientific and technical information for the scientific community, by facilitating national negotiations on digital documentary resources and supporting open science. 

To automatically receive press releases from the American Chemical Society, contact newsroom@acs.org .

Note: ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies.

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ACS Newsroom newsroom@acs.org

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