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These 10 free AP Chemistry questions are organized by exam domain, so you can see how each part of the Advanced Placement Chemistry blueprint is tested. Reveal the answer and explanation under each question.
The photoelectron spectrum of a pure element shows exactly three peaks. Reading from higher binding energy to lower binding energy, the relative peak heights are 2 : 2 : 3. Which element produced this spectrum?
Correct answer: B - Nitrogen
Each molecule below contains at least one polar covalent bond, yet only one of them has no net dipole moment. Which molecule is nonpolar overall?
Correct answer: A - CCl₄
The four compounds below all have molar masses between 58 and 60 g/mol. Which compound has the highest normal boiling point?
Correct answer: D - CH₃CH₂CH₂OH (1-propanol)
A rigid, sealed container holds a mixture of He(g) and Ar(g) at 300 K. Which statement correctly compares the two gases?
Correct answer: A - The two gases have the same average kinetic energy, but the He atoms have a greater average speed.
Aqueous solutions of Pb(NO₃)₂ and KI are mixed, and a yellow precipitate of PbI₂ forms. Which equation is the correct net ionic equation for this reaction?
Correct answer: D - Pb²⁺(aq) + 2 I⁻(aq) → PbI₂(s)
For the decomposition of compound X, a plot of 1/[X] versus time gives a straight line with a positive slope, while plots of [X] versus time and ln[X] versus time are both curved. What is the order of the reaction with respect to X, and what are the units of the rate constant k?
Correct answer: B - Second order; k has units of M⁻¹·s⁻¹
A student dissolves 8.00 g of NH₄NO₃(s) (molar mass 80.0 g/mol) in 100.0 g of water in a coffee-cup calorimeter. The temperature falls from 24.00 °C to 18.30 °C. The resulting solution has a mass of 108.0 g and a specific heat capacity of 4.18 J·g⁻¹·°C⁻¹. What is the enthalpy of dissolution of NH₄NO₃?
Correct answer: C - +25.7 kJ/mol
At 25 °C the molar solubility of Mg(OH)₂ in pure water is 1.4 × 10⁻⁴ M. What is the value of Ksp for Mg(OH)₂ at this temperature?
Correct answer: B - 1.1 × 10⁻¹¹
What is the pH of a 0.0050 M Ba(OH)₂(aq) solution at 25 °C?
Correct answer: D - 12.00
A silver spoon is electroplated with silver in an electrolytic cell containing Ag⁺(aq). Which statement correctly describes the spoon during the plating process?
Correct answer: C - It is the cathode, where reduction occurs, and it is connected to the negative terminal.
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