AP Chemistry Practice Test 24

Test Information

Question 10 questions

Time 15 minutes

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1. What is the pKa of the methylammonium ion, CH3NH3+, which is the conjugate acid of methylamine in the previous question?

Questions 2-5 refer to the following information.

VesselABC
GasBromomethaneBromoethane1-Bromopropane
FormulaCH3BrCH3CH2BrCH3CH2CH2 Br
Molar mass95 g/mol109 g/mol123 g/mol
Pressure0.4 atm0.3 atm0.2 atm
Temperature398 K398 K398 K

Note that in addition to the data in the table, the gases are held in separate, identical, rigid vessels.

2. The sample with the lowest density is

3. The average kinetic energy

4. Which of these gases will condense at the lowest pressure, assuming that the temperature is held constant?

5. Which attractive force is least likely to be the cause of condensation?

Questions 6-7 refer to the following information.

Image

6. The Lewis electron-dot structures for sulfur trioxide and for the sulfite ion are given above. Which statement best describes the geometry of these two substances?

7. Which statement below describes the charge, polarity, and resonance characteristics of the sulfite ion and of the sulfur trioxide species shown above?

Questions 8-10 refer to the following information.

Pb2+(aq) + 2Cl-(aq) → PbCl2(s)

A chemist mixes a dilute solution of lead(II) perchlorate with an excess of potassium chloride to precipitate lead(II) chloride (Ksp = 1.7 × 10-5). The net ionic equation is given above for the reaction.

8. Which of the following is a molecular equation for this reaction?

9. Which of the following particulate views represents the experiment after the reactants are mixed thoroughly and the solids are given time to precipitate?

10. Within a factor of ten, what is the approximate molar solubility of lead(II) chloride in distilled water?