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AP Chemistry Practice Test

Build AP Chemistry readiness with original atomic structure, reactions, kinetics, equilibrium, acids, electrochemistry, and lab reasoning questions.

AP Chemistry practice sets

This page provides one canonical AP Chemistry practice hub with five short sets of 10 original questions each. The sets cover atomic structure, bonding, properties of substances and mixtures, reactions, stoichiometry, kinetics, thermochemistry, equilibrium, acids and bases, thermodynamics, electrochemistry, experimental design, and data analysis.

Skills covered

  • Models and representations — particulate, symbolic, mathematical, and macroscopic descriptions
  • Questions and methods — variables, controls, procedures, measurements, and error analysis
  • Representing data and phenomena — equations, graphs, models, and chemical evidence
  • Mathematical routines — moles, stoichiometry, rates, equilibrium, pH, energy, and electrochemistry
  • Argumentation — claims supported by chemical evidence and reasoning

AP Chemistry course and exam scope

College Board organizes AP Chemistry into nine units: Atomic Structure and Properties; Compound Structure and Properties; Properties of Substances and Mixtures; Chemical Reactions; Kinetics; Thermochemistry; Equilibrium; Acids and Bases; and Thermodynamics and Electrochemistry.

College Board’s current exam page describes a hybrid digital exam with multiple-choice questions in Bluebook and handwritten free-response answers in paper booklets. Calculators are permitted under current policy, and reference materials are provided; device rules, timing, and exam details can change, so check the current official materials before test day.

How to use this page

Start with one untimed set to identify a topic gap, then use timed sets to build pacing. For every missed item, check the chemical representation, units, conditions, and evidence before solving a new similar problem.

These questions are original supplemental practice. They are not official College Board questions, secure AP Exam content, AP Classroom assignments, a score predictor, or a substitute for current AP policies and course materials.

For current scope and preparation, review the AP Chemistry course page, the AP Central course overview, the AP Chemistry exam page, the AP Chemistry Course and Exam Description, and the AP calculator policy.

For more study options, visit AP Exam Tests or explore AP Biology Practice, AP Calculus AB & BC Practice, High School Course Tests, and Pomodoro.

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AP Chemistry Practice Questions

A 10-question AP Chemistry practice set on ap chemistry: thermochemistry, equilibrium, and acids and bases, with answers and explanations.

Read the chemical model, equation, data, or experimental scenario carefully. Choose the best answer and review the explanation after each response.

10 Questions
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1. QuestionMultiple choice

An endothermic process does what?

Please select an answer first.

Correct answer: A

The correct answer is Absorbs heat from the surroundings.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: Endothermic processes have positive heat transfer into the system under the stated convention.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Endothermic processes have positive heat transfer into the system under the stated convention.

2. QuestionMultiple choice

What does Hess’s law allow a chemist to do?

Please select an answer first.

Correct answer: B

The correct answer is Add known reaction enthalpies to find the enthalpy of a target reaction.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: Enthalpy is a state function, so reaction equations can be combined algebraically.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Enthalpy is a state function, so reaction equations can be combined algebraically.

3. QuestionMultiple choice

What happens at dynamic equilibrium?

Please select an answer first.

Correct answer: C

The correct answer is Forward and reverse reaction rates are equal while concentrations remain constant.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: Dynamic equilibrium is a balance of rates, not an absence of molecular change.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Dynamic equilibrium is a balance of rates, not an absence of molecular change.

4. QuestionMultiple choice

For a reaction with K much greater than 1, what is favored at equilibrium?

Please select an answer first.

Correct answer: D

The correct answer is Products.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: A large equilibrium constant indicates a product-favored equilibrium under the stated conditions.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

A large equilibrium constant indicates a product-favored equilibrium under the stated conditions.

5. QuestionMultiple choice

If a system at equilibrium is stressed by adding reactant, what does Le Châtelier’s principle predict?

Please select an answer first.

Correct answer: A

The correct answer is The system shifts in the direction that tends to consume the added reactant.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: The system responds in a direction that reduces the imposed concentration change.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

The system responds in a direction that reduces the imposed concentration change.

6. QuestionMultiple choice

What is pH defined as?

Please select an answer first.

Correct answer: B

The correct answer is -log[H⁺].

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: pH is the negative base-10 logarithm of hydrogen ion concentration.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

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

7. QuestionMultiple choice

At 25°C, a solution with pH 3 is how many times more acidic in hydrogen ion concentration than pH 5?

Please select an answer first.

Correct answer: C

The correct answer is 100 times.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: A difference of 2 pH units corresponds to a factor of 10² = 100.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

A difference of 2 pH units corresponds to a factor of 10² = 100.

8. QuestionMultiple choice

What is a buffer?

Please select an answer first.

Correct answer: D

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

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: A weak acid/base conjugate pair can consume added H⁺ or OH⁻.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

A weak acid/base conjugate pair can consume added H⁺ or OH⁻.

9. QuestionMultiple choice

At the equivalence point of a strong acid-strong base titration, what is true?

Please select an answer first.

Correct answer: A

The correct answer is Stoichiometric amounts of acid and base have reacted.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: Equivalence is defined by equal stoichiometric neutralization, not a fixed indicator color.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Equivalence is defined by equal stoichiometric neutralization, not a fixed indicator color.

10. QuestionMultiple choice

What happens to a solubility equilibrium when a common ion is added?

Please select an answer first.

Correct answer: B

The correct answer is Solubility generally decreases.

  1. Identify the chemistry idea: Determine whether the AP Chemistry practice prompt asks about particles, representations, equations, energy, rate, equilibrium, or an experimental method.
  2. Apply the method: The common ion shifts dissolution equilibrium toward the solid.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

The common ion shifts dissolution equilibrium toward the solid.

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Frequently asked questions about AP Chemistry Practice Tests

What topics are included on this AP Chemistry practice page?

The page covers atomic structure, bonding, substances and mixtures, reactions, kinetics, thermochemistry, equilibrium, acids and bases, thermodynamics, electrochemistry, and lab reasoning.

Are these official College Board questions?

No. These are original supplemental questions. Use AP Classroom, Bluebook previews, AP Central, and current College Board course materials for official preparation.

Is the AP Chemistry exam digital?

College Board’s current exam page describes a hybrid digital exam, with multiple-choice questions in Bluebook and handwritten free-response answers in paper booklets.

Can I use a calculator on AP Chemistry?

Current College Board policy permits calculators for AP Chemistry, but students should check the latest approved-device and digital calculator information.

How should I answer a chemistry data question?

Identify the variables and trend, connect the evidence to a chemical model or equation, and state a conclusion with correct units and conditions.