NumicornNumicornLearn, solve, progress

AP Exams · Chemistry · Science Practices

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.

Select a test

5 Tests
1. Test2. Test3. Test4. Test5. Test

2. Test

AP Chemistry Practice Questions

A 10-question AP Chemistry practice set on ap chemistry: chemical reactions, stoichiometry, and kinetics, 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
0/100%
Reading settings
Reading settings
Text size
18px
Line spacing
1.70
C 0I 0U 10
1. QuestionMultiple choice

How many moles are in 18.0 g of water, approximately?

Please select an answer first.

Correct answer: C

The correct answer is 1.00 mol.

  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: Water has molar mass about 18.0 g/mol, so 18.0 g is about 1.00 mol.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Water has molar mass about 18.0 g/mol, so 18.0 g is about 1.00 mol.

2. QuestionMultiple choice

What is the limiting reactant?

Please select an answer first.

Correct answer: D

The correct answer is The reactant consumed first that limits product formation.

  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 limiting reactant sets the maximum amount of product.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

The limiting reactant sets the maximum amount of product.

3. QuestionMultiple choice

Which equation is a net ionic equation?

Please select an answer first.

Correct answer: A

The correct answer is An equation showing only species that undergo chemical change.

  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: Net ionic equations omit spectator ions and show the reacting species.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Net ionic equations omit spectator ions and show the reacting species.

4. QuestionMultiple choice

If 2H₂ + O₂ → 2H₂O, how many moles of water form from 3 moles of H₂ with excess O₂?

Please select an answer first.

Correct answer: B

The correct answer is 3 mol.

  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 mole ratio H₂:H₂O is 2:2, so 3 moles of H₂ produce 3 moles of water.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

The mole ratio H₂:H₂O is 2:2, so 3 moles of H₂ produce 3 moles of water.

5. QuestionMultiple choice

What does a catalyst do?

Please select an answer first.

Correct answer: C

The correct answer is It lowers activation energy without being consumed overall.

  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 catalyst provides a lower-energy pathway and is regenerated.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

A catalyst provides a lower-energy pathway and is regenerated.

6. QuestionMultiple choice

What generally happens to reaction rate when temperature increases?

Please select an answer first.

Correct answer: D

The correct answer is The rate often increases because more particles have sufficient energy for effective collisions.

  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: Higher temperature increases the fraction of particles able to overcome activation energy.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Higher temperature increases the fraction of particles able to overcome activation energy.

7. QuestionMultiple choice

In a rate law rate = k[A]², what happens to rate if [A] doubles while other factors stay constant?

Please select an answer first.

Correct answer: A

The correct answer is It becomes four times as large.

  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 square dependence gives 2² = 4 times the original rate.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

The square dependence gives 2² = 4 times the original rate.

8. QuestionMultiple choice

What does a reaction mechanism describe?

Please select an answer first.

Correct answer: B

The correct answer is A sequence of elementary steps that can produce the overall 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: A mechanism breaks an overall process into molecular steps.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

A mechanism breaks an overall process into molecular steps.

9. QuestionMultiple choice

What does percent yield compare?

Please select an answer first.

Correct answer: C

The correct answer is Actual yield with theoretical yield.

  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: Percent yield = actual yield divided by theoretical yield times 100 percent.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Percent yield = actual yield divided by theoretical yield times 100 percent.

10. QuestionMultiple choice

Why should a chemical equation be balanced before stoichiometric calculation?

Please select an answer first.

Correct answer: D

The correct answer is Coefficients provide the conserved mole ratios.

  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: Balanced coefficients reflect conservation of atoms and reaction proportions.
  3. Check units and evidence: Verify the chemical equation, units, signs, conditions, and connection between the model and the observed phenomenon.

Balanced coefficients reflect conservation of atoms and reaction proportions.

Previous testNext test

Choose your next study path

AP Exam Tests

Browse AP subject practice and exam preparation.

AP Biology Practice

Practice cells, genetics, evolution, ecology, and scientific reasoning.

AP Statistics Practice

Practice data analysis, probability, inference, and regression.

High School Course Tests

Review chemistry and other high school topics.

Pomodoro Timer

Use focused study intervals for AP Chemistry review.

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.