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AP Chemistry practice test

StudySim's free AP Chemistry practice test has 24 sample questions with answer explanations. Connect particle models to reactions, equilibrium, energy, acids, bases, and electrochemistry. Use the answer explanations to understand the reasoning, then revisit the topics that need more work.

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Sample AP Chemistry questions

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AP Chemistry Sample Questions

Practice quiz

1. An atom has 17 protons, 18 neutrons, and 18 electrons. What is its net charge?

2. An element has isotopes of masses 10.0 u (20%) and 11.0 u (80%). What is its average atomic mass?

3. Which best explains why the first ionization energy generally increases from left to right across a period?

4. Which molecule has a bent molecular geometry and a net dipole?

5. Why does solid NaCl conduct electricity poorly while molten NaCl conducts?

6. Which substance is expected to have the highest normal boiling point?

7. An ideal gas occupies 3.0 L at 1.0 atm. At constant temperature and amount, what volume does it occupy at 1.5 atm?

8. How many moles of solute are in 250 mL of 0.20 M solution?

9. A 20.0 mL sample of 0.50 M solution is diluted to 100.0 mL. What is the final concentration?

10. For 2H₂(g) + O₂(g) → 2H₂O(g), 3 mol H₂ react with 2 mol O₂. What is the maximum water yield?

11. Which is the net ionic equation when aqueous AgNO₃ and NaCl form a precipitate?

12. In Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s), which statement is correct?

13. For rate = k[A]²[B], what happens to rate if [A] doubles while [B] is unchanged?

14. What does a catalyst change for a reaction at fixed temperature?

15. A 50.0 g water sample warms by 10.0°C. Taking c = 4.18 J/(g·°C), what heat does the water absorb?

16. Reaction 1 has ΔH = +40 kJ; reaction 2 has ΔH = −75 kJ. If adding their equations gives the target reaction, what is its ΔH?

17. For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), which is Kc?

18. For a reaction at a fixed temperature, Q < K. Which direction has a net reaction tendency?

19. The equilibrium 2NO₂(g) ⇌ N₂O₄(g) is exothermic to the right. What happens on increasing temperature at fixed volume?

20. At 25°C, what is the pH of 1.0 × 10⁻³ M HCl, assuming complete dissociation and negligible water contribution?

21. Which mixture can act as a buffer?

22. A buffer initially contains 0.20 mol HA and 0.20 mol A⁻ in 1.0 L, with pKa = 4.80. After 0.050 mol HCl is added, the volume is essentially unchanged. Using Henderson–Hasselbalch and log₁₀(0.60) ≈ −0.22, what is its approximate pH?

23. A reaction has ΔH < 0 and ΔS > 0. Under the usual constant-temperature, constant-pressure criterion, when is it thermodynamically favored?

24. A galvanic cell has E°cell = +1.10 V. Which statement is correct for the standard cell reaction?

0 of 24 answered

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Exam at a glance

AP Chemistry preparation includes Atomic and compound structure, Properties of substances, Chemical reactions, Kinetics, Thermochemistry, Equilibrium, Acids and bases, Thermodynamics and electrochemistry. This StudySim bank provides original multiple-choice skill practice. Consult the official framework for the complete exam format, required tasks, and current policies.

Detail	Information
Content framework	College Board: AP Chemistry course framework

Source: College Board: AP Chemistry course framework · Last reviewed Oct 27, 2026

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AP Chemistry content areas

Atomic and compound structure

Practice atomic and compound structure with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Properties of substances

Practice properties of substances with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Chemical reactions

Practice chemical reactions with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Kinetics

Practice kinetics with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Thermochemistry

Practice thermochemistry with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Equilibrium

Practice equilibrium with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Acids and bases

Practice acids and bases with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Thermodynamics and electrochemistry

Practice thermodynamics and electrochemistry with original questions and explanations. Topic labels describe this bank, rather than official section weights.

Study tips for AP Chemistry

Explain your answer

Before opening the explanation, identify the evidence, calculation, or rule that supports your choice. Explain why the other choices do not fit.

Practice a weak topic

Use the topic and difficulty filters in exam prep, then review your missed questions. These difficulty labels are editorial estimates, not calibrated exam statistics.

Use official exam materials too

Pair these skill checks with official practice materials for pacing, extended responses, and any tasks not represented by multiple-choice practice.

A few useful details

AP Chemistry FAQ

Is this an official AP Chemistry exam?

No. StudySim writes original practice questions independently. This is not a full-length exam, an official past paper, or a predictor of an official exam score.

Can I practice without signing up?

Yes. These prepared practice questions and their explanations are free to use without an account. They do not require an AI generation request.

How should I use the practice results?

Use the raw number correct and topic breakdown to decide what to review. Difficulty labels are editorial estimates. Results are not converted into an official scaled score.

Does this include every exam task?

No. This bank focuses on multiple-choice skills. Official exams may also require essays, free responses, performances, audio, projects, or other task formats; use official resources for those components.

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