Question bank / Advanced Placement / AP Chemistry AP Chemistry practice questions Original, AI-authored English practice with worked guidance. Selected topics only; independent teacher review is pending. This is not a complete syllabus, official past-paper collection or predicted exam score. SubjectScout is not affiliated with or endorsed by College Board. SAT practice is not a full adaptive test; AP practice does not simulate an entire exam.
9 original questions across 9 selected topic areas. No account or payment required to practise.
All topics Unit 1: Atomic Structure and Properties (1) Unit 2: Compound Structure and Properties (1) Unit 3: Properties of Substances and Mixtures (1) Unit 4: Chemical Reactions (1) Unit 5: Kinetics (1) Unit 6: Thermochemistry (1) Unit 7: Equilibrium (1) Unit 8: Acids and Bases (1) Unit 9: Thermodynamics and Electrochemistry (1) Official AP framework reference (framework only, not a source of copied questions).
Topic All topics Unit 1: Atomic Structure and Properties Unit 2: Compound Structure and Properties Unit 3: Properties of Substances and Mixtures Unit 4: Chemical Reactions Unit 5: Kinetics Unit 6: Thermochemistry Unit 7: Equilibrium Unit 8: Acids and Bases Unit 9: Thermodynamics and Electrochemistry Practice view All questions Unanswered Bookmarked Review mistakes Difficulty All levels Foundation Standard Challenge Search questions
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Loading saved progress Question 1 · Unit 1: Atomic Structure and Properties · foundation
A hypothetical element has only two isotopes: 75.0% have mass 20.0 u and 25.0% have mass 22.0 u. What is its average atomic mass? A. 20.0 uB. 20.5 uC. 21.0 uD. 21.5 uCheck answer Question 2 · Unit 2: Compound Structure and Properties · standard
Which description correctly explains why an isolated CO2 molecule has no permanent molecular dipole? A. Its C-O bonds are nonpolar.B. Its shape is bent, so the bond dipoles cancel.C. Its linear shape makes equal C-O bond dipoles cancel.D. Its carbon atom has two lone pairs.Check answer Question 3 · Unit 3: Properties of Substances and Mixtures · standard
A fixed amount of ideal gas in a sealed, adjustable-volume container occupies 4.00 L at 300 K and 1.50 atm. At constant temperature, its pressure becomes 2.00 atm. What is its new volume? A. 2.00 LB. 3.00 LC. 4.50 LD. 5.33 LCheck answer Question 4 · Unit 4: Chemical Reactions · challenge
For 2 H2(g) + O2(g) -> 2 H2O(g), a mixture initially contains 5.0 mol H2 and 2.0 mol O2, with no water. Assuming complete reaction, how many moles of H2O form? A. 2.0 molB. 2.5 molC. 4.0 molD. 5.0 molCheck answer Question 5 · Unit 5: Kinetics · standard
At fixed temperature, rate = k[A]^2[B]. If [A] doubles and [B] is halved, by what factor does the rate change? A. 0.5B. 1C. 2D. 4Check answer Question 6 · Unit 6: Thermochemistry · standard
A reaction warms 100.0 g of solution from 20.0 to 25.0 degrees C in an insulated calorimeter. Use c = 4.00 J/(g degrees C), neglect calorimeter heat capacity, and assume only the reaction supplies heat. What is q for the reaction? A. -2000 JB. +2000 JC. -10000 JD. +10000 JCheck answer Question 7 · Unit 7: Equilibrium · standard
For H2(g) + I2(g) <=> 2 HI(g), equilibrium concentrations are [H2] = 0.20 M, [I2] = 0.20 M, and [HI] = 0.80 M. What is Kc? A. 4B. 8C. 16D. 32Check answer Question 8 · Unit 8: Acids and Bases · challenge
At 25 degrees C, 20.0 mL of 0.100 M HCl is mixed with 30.0 mL of 0.100 M NaOH. Assume complete dissociation, additive volumes, and ideal dilute behavior. What is the final pH, to two decimal places? A. 1.70B. 7.00C. 12.30D. 13.00Check answer Question 9 · Unit 9: Thermodynamics and Electrochemistry · challenge
For a reaction at 300 K, delta H = +24.0 kJ/mol and delta S = +100 J/(mol K). Assuming these values apply at 300 K, what is delta G at that temperature? A. -6.0 kJ/molB. +6.0 kJ/molC. +23.9 kJ/molD. +54.0 kJ/molCheck answer All Advanced Placement subjects
