Free Grade 12 Chemistry Worksheets with Answers

Grade 12 Atomic Structure & Isotopes

HS-PS1-1

Finding protons, neutrons and electrons from atomic number, mass number and charge.

e.g. Lithium-7 has atomic number 3. How many neutrons does it have?

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Grade 12 Electron Shells & Valence Electrons

HS-PS1-1

Arranging electrons in shells for the first 20 elements and finding valence electrons.

e.g. How many electron shells does a helium atom (atomic number 2) have?

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Grade 12 Periodic Table Groups & Trends

HS-PS1-2

Groups, periods and trends in atomic radius, ionization energy and electronegativity.

e.g. Elements in the same group have the same number of what?

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Grade 12 Ionic, Covalent & Metallic Bonds

HS-PS1-3

How atoms bond by transferring or sharing electrons, and the properties that result.

e.g. Covalent bonds usually form between which types of elements?

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Grade 12 Moles & Molar Mass

HS-PS1-7

Calculating molar mass and converting between grams and moles.

e.g. What is the molar mass of CaCO₃ (calcium carbonate)? (Ca = 40, C = 12, O = 16)

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Grade 12 Balancing Chemical Equations

HS-PS1-7

Using coefficients to balance chemical equations so atoms are conserved.

e.g. Balance the equation: Mg + O₂ → MgO

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Grade 12 Solution Concentration (Molarity)

HS-PS1-5

Calculating molarity and how much solute is needed to make a solution.

e.g. How many moles of solute are in 0.25 L of a 4 M solution?

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Grade 12 Gas Laws

HS-PS3-2

Boyle's and Charles's laws for how gas pressure, volume and temperature are related.

e.g. A gas at 300 kPa has a volume of 20 L. At constant temperature, the pressure rises to 1200 kPa. What is the new volume?

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Grade 12 Types of Chemical Reactions

HS-PS1-2

Synthesis, decomposition, single and double replacement and combustion reactions.

e.g. Reaction type? NaCl + AgNO₃ → NaNO₃ + AgCl

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Grade 12 Acids, Bases & pH

HS-PS1-6

The pH scale, properties of acids and bases, neutralization and calculating pH.

e.g. What color does litmus paper turn in an acid?

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Grade 12 Radioactivity & Half-Life

HS-PS1-8

Calculating how much of a radioactive sample remains, and dating with half-lives.

e.g. A sample with a half-life of 20 days drops from 640 g to 160 g. How much time has passed?

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Grade 12 Chemistry Basics (Mixed)

A mixed set on atoms, elements, compounds and chemical reactions.

e.g. Where are electrons found in an atom?

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Grade 12 Compounds & Molecules

HS-PS1-2

How elements combine into compounds and molecules, and reading chemical formulas.

e.g. How many atoms are in one molecule of H₂O?

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Grade 12 Challenge: Think Like a Scientist

Challenge

Surprising questions and thought experiments that test real scientific reasoning.

e.g. Why does your breath make fog on a cold window?

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