Chemistry Worksheets

These chemistry worksheets are made by a free generator in your web browser, with answer keys calculated by the tool. Pick a topic such as atoms, chemical bonding, chemical reactions, acids and bases, or nuclear chemistry, tick the activities you want, and the printable pages update live as you work. It needs no sign-up, and nothing you make is uploaded or sent to a server.

Each sheet can include labeling, fill-in-the-blanks, vocabulary matching, sorting, short answer questions, and drawing tasks. Some sheets generate their own problems, such as balancing equations, half-life, and pH, and the answer key is calculated for every new set. Use it for basic chemistry practice from about grade 5 through high school.

How to make a chemistry worksheet

1. Open the Topic menu and choose a topic, such as Chemical bonding or Acids and bases. The tool opens on Atoms.
2. Open the Worksheet menu and pick a sheet within that topic. Each sheet starts with two or three activities already ticked.
3. Tick or untick activities on the left. The printable pages on the right update as you change them.
4. Set Items per activity (4, 6, 8, 10 or 12) for sheets with generated problems.
5. Turn the Word bank on for easier work, or off to make the sheet harder.
6. Turn Answer key pages on if you need the answers included.
7. Turn Color pictures off to get black line art that saves ink.
8. Add a Name and date line and edit the Worksheet title.
9. Choose US Letter or A4 as the paper size.
10. Click New version to shuffle the word bank, matching letters and order for a different set.

When the sheet looks right, click Download PDF for a sharp file that prints at true size, or Print to open the print dialog with only the worksheet pages. Click Copy link to share a link that reopens the same worksheet, including your current New version.

Tip: the balancing, ionic formula, half-life and pH sheets make new problems each time you click New version, so a whole class can practice with different sets.

How do you balance a chemical equation?

To balance a chemical equation, change the coefficients, the numbers placed in front of formulas, until each element has the same number of atoms on both sides. You never change subscripts, because subscripts define which substance you have. This follows the law of conservation of mass: atoms are rearranged in a reaction, not created or destroyed.

For example, 2 HgO → 2 Hg + O₂ works because there are 2 Hg and 2 O on each side. In C₅H₁₂ + 8 O₂ → 5 CO₂ + 6 H₂O, there are 5 C, 12 H and 16 O on each side. Count atoms element by element, and check your work at the end.

What is the difference between ionic and covalent bonds?

Ionic bonds form when electrons are transferred from a metal to a nonmetal, creating ions held together by opposite charges. Covalent bonds form when nonmetal atoms share electrons. Ionic examples include NaCl, MgO and CaF₂, while covalent examples include H₂O, CO₂, CH₄ and NH₃.

What is half-life?

Half-life is the time it takes for half of a radioactive sample to decay. Each half-life cuts the remaining amount in half, so 80 g becomes 40 g, then 20 g, 10 g and finally 5 g after four half-lives. In alpha decay, the mass number drops by 4 and the atomic number drops by 2. In beta decay, the atomic number rises by 1 and the mass number stays the same.

What does the pH scale measure?

The pH scale measures how acidic or basic a solution is, based on its hydrogen ion concentration. It runs from 0 to 14, and the formula is pH = −log[H⁺]. A pH below 7 is acidic, 7 is neutral, and a pH above 7 is basic. Lemon juice and vinegar are acidic, pure water is neutral, and baking soda solution and soap are basic.

The Acid, base or neutral? activity gives random pH values from 0 to 14 and asks students to classify each one; it counts pH 3 or lower and 11 or higher as strong.

Frequently asked questions

Do the worksheets come with answers?

Yes. Turn on Answer key pages to add pages with the answers filled in, shown in blue. Those pages are included when you use Download PDF or Print, so you can get a chemistry worksheet with answers as a PDF.

Can I make a new set of problems?

Yes. For sheets with generated problems, change Items per activity to set how many problems you want, then click New version for a fresh set. The answer key is recalculated for each new set.

Is it free, and do I need an account?

It is free and needs no sign-up. Everything runs in your browser, and nothing you create is uploaded or sent to a server.

Can I save ink when printing?

Yes. Turn Color pictures off to print black line art, which uses less ink. You can also choose US Letter or A4 paper size before you print.

Which grade levels do these sheets suit?

Parts of an atom, physical and chemical changes, and the pH scale suit grades 5 to 8. Tables, Bohr models, Lewis dot structures, bonding, balancing equations and reaction types suit grades 8 to 10. Half-life, decay equations and pH calculations suit grades 9 to 10, which is high school chemistry.

Related tools

• Printable periodic table: Use it as a reference when you need element symbols, atomic numbers or masses while working on a sheet.
• Periodic table with charges: Use it when you are writing ionic formulas and need the charge of each ion.
• Naming compounds practice: Use it for extra practice turning formulas into names and names into formulas.
• Periodic table flash cards: Use it to memorize element names and symbols between worksheet sessions.
• States of matter worksheet: Use it for practice on solids, liquids, gases and changes between them.
• Physics worksheets: Use it if you need practice with forces, electricity or waves alongside your chemistry work.
• Lab report template: Use it to organize your observations and results after a chemistry experiment.