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Chemistry Practice Tests

These Grade 12 Science practice tests develop Chemistry skills through atomic structure, periodic trends, bonding, stoichiometry, gases, thermochemistry, kinetics, equilibrium, acids, redox, organic chemistry, and laboratory reasoning.

Skills covered

  • Analyzing isotopes, electron configurations, valence electrons, periodic trends, electronegativity, Lewis structures, and intermolecular forces
  • Using moles, molar mass, limiting reactants, percent yield, gas laws, molarity, dilution, and calorimetry relationships
  • Explaining activation energy, catalysts, entropy, dynamic equilibrium, Le Châtelier’s principle, equilibrium constants, and Gibbs free energy
  • Applying Brønsted–Lowry acids and bases, pH, buffers, neutralization, oxidation, reduction, galvanic cells, and electrolysis
  • Recognizing functional groups, hydrocarbons, isomers, polymers, spectroscopy, chromatography, environmental chemistry, and laboratory safety

How to use these practice tests

Write the relevant equation, identify the known quantities and units, and check whether the answer matches the chemical relationship. For conceptual questions, connect particle-level structure to observable properties.

For more Grade 12 Science practice, return to the Grade 12 Science category.

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Grade 12 Chemistry Practice Tests

Practice Grade 12 Science questions about atomic structure, periodic trends, bonding, stoichiometry, gases, thermochemistry, kinetics, equilibrium, acids, redox, and organic chemistry.

Choose the best answer. Track units, chemical relationships, equations, and conditions carefully, and distinguish thermodynamic favorability from reaction rate.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What is a Brønsted–Lowry acid?

Please select an answer first.

Correct answer: A

The correct answer is A proton donor.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: Brønsted–Lowry theory defines an acid by its ability to donate a proton (H^+).
  3. Check units and relationships: The correct answer is A proton donor.

Brønsted–Lowry theory defines an acid by its ability to donate a proton (H^+).

2. QuestionMultiple choice

What is the conjugate base of an acid?

Please select an answer first.

Correct answer: B

The correct answer is The species that remains after the acid donates a proton.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: An acid and its conjugate base differ by one proton.
  3. Check units and relationships: The correct answer is The species that remains after the acid donates a proton.

An acid and its conjugate base differ by one proton.

3. QuestionMultiple choice

Which expression defines pH?

Please select an answer first.

Correct answer: C

The correct answer is pH=−log⁡[H+]pH=-\log[H^+].

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: pH is the negative base-10 logarithm of hydrogen-ion concentration.
  3. Check units and relationships: The correct answer is pH=−log⁡[H+]pH=-\log[H^+].

pH is the negative base-10 logarithm of hydrogen-ion concentration.

4. QuestionMultiple choice

What is characteristic of a strong acid in water?

Please select an answer first.

Correct answer: D

The correct answer is It dissociates nearly completely under the stated conditions.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: Strong acids have large dissociation in water, producing a relatively high concentration of hydronium ions.
  3. Check units and relationships: The correct answer is It dissociates nearly completely under the stated conditions.

Strong acids have large dissociation in water, producing a relatively high concentration of hydronium ions.

5. QuestionMultiple choice

What is a buffer?

Please select an answer first.

Correct answer: A

The correct answer is A solution that resists large pH changes when small amounts of acid or base are added.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: Buffers commonly contain a weak acid and its conjugate base or a weak base and its conjugate acid.
  3. Check units and relationships: The correct answer is A solution that resists large pH changes when small amounts of acid or base are added.

Buffers commonly contain a weak acid and its conjugate base or a weak base and its conjugate acid.

6. QuestionMultiple choice

What is a neutralization reaction?

Please select an answer first.

Correct answer: B

The correct answer is A reaction in which an acid and base react, often forming water and a salt.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: In many aqueous neutralizations, hydrogen ions and hydroxide ions combine to form water.
  3. Check units and relationships: The correct answer is A reaction in which an acid and base react, often forming water and a salt.

In many aqueous neutralizations, hydrogen ions and hydroxide ions combine to form water.

7. QuestionMultiple choice

What is oxidation in a redox reaction?

Please select an answer first.

Correct answer: C

The correct answer is Loss of electrons or an increase in oxidation number.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: The mnemonic OIL means oxidation is loss of electrons.
  3. Check units and relationships: The correct answer is Loss of electrons or an increase in oxidation number.

The mnemonic OIL means oxidation is loss of electrons.

8. QuestionMultiple choice

What is reduction?

Please select an answer first.

Correct answer: D

The correct answer is Gain of electrons or a decrease in oxidation number.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: Reduction occurs when a species accepts electrons; the mnemonic RIG means reduction is gain.
  3. Check units and relationships: The correct answer is Gain of electrons or a decrease in oxidation number.

Reduction occurs when a species accepts electrons; the mnemonic RIG means reduction is gain.

9. QuestionMultiple choice

What happens in a galvanic cell?

Please select an answer first.

Correct answer: A

The correct answer is A spontaneous redox reaction produces electrical energy.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: Galvanic cells convert chemical energy from a spontaneous redox process into electrical energy.
  3. Check units and relationships: The correct answer is A spontaneous redox reaction produces electrical energy.

Galvanic cells convert chemical energy from a spontaneous redox process into electrical energy.

10. QuestionMultiple choice

What is electrolysis?

Please select an answer first.

Correct answer: B

The correct answer is Using electrical energy to drive a nonspontaneous chemical reaction.

  1. Identify the chemistry concept: Determine whether the question concerns atomic structure, bonding, stoichiometry, gases, energy, kinetics, equilibrium, acids, redox, organic chemistry, or laboratory practice.
  2. Apply the chemical principle: Electrolysis forces redox changes that would not proceed spontaneously under the same conditions.
  3. Check units and relationships: The correct answer is Using electrical energy to drive a nonspontaneous chemical reaction.

Electrolysis forces redox changes that would not proceed spontaneously under the same conditions.

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