9.11 Multiple Choice Questions

4 min read•may 3, 2023

AP Chemistry 🧪

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Multiple Choice Practice for Applications of Thermodynamics

Welcome to Unit 9 AP Chemistry Multiple Choice Questions! Grab some paper and a pencil 📄 to record your answers as you go. You can see how you did on the Unit 9 Practice Questions Answers and Review sheet once you're done. Don't worry, we have tons of resources available if you get stumped 😕 on a question. And if solo study is not your thing, join a group in Hours!

Not ready to take a quiz yet? Take a look at the Intro to Unit 9

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Facts about the test: The AP Chemistry exam has 60 multiple choice questions and you will be given 1 hour 30 minutes to complete the section. That means it should take you around 15 minutes to complete 10 questions.

*The following questions were not written by College Board and, although they cover information outlined in the AP Chemistry Course and Exam Description, the formatting on the exam may be different.

1. Which of the following will have a positive change in entropy?

2. A reaction has the following thermodynamic data. Which of the following statements is true?

ΔH° = -75.2 kJ/mol

ΔS° = 53.4 J/mol · K

A. The reaction is never thermodynamically favorable.

B. The reaction is thermodynamically favorable at high temperatures.

C. The reaction is thermodynamically favorable at all temperatures.

D. The reaction is thermodynamically favorable at low temperatures.

3. What is the value for ΔG and thermodynamic favorability of the following reaction at 450 K?

A. ΔG = 170. kJ/mol; The reaction is thermodynamically favorable.

B. ΔG = 10.9 kJ/mol; The reaction is NOT thermodynamically favorable.

C. ΔG = 10.9 kJ/mol; The reaction is thermodynamically favorable.

D. ΔG = 170. kJ/mol; The reaction is NOT thermodynamically favorable.

4. What is the value for the equilibrium constant (K) at 305 K given the following information?

A. 1.01

B. 5.05 x 10^5

C. 0.987

D. 1.98 x 10^-5

5. Given the following redox reaction, which half-reaction will occur at the cathode?

6. A galvanic cell is set up such that a redox reaction occurs between silver and aluminum. Given the following data, determine the cell potential.

A. 4.06 V

B. 0.86 V

C. -0.86 V

D. 2.46 V

7. Given that the cell potential for a reaction is 0.52 V at 298 K, what is the sign for free energy and thermodynamic favorability of the following reaction?

A. ΔG is positive and the reaction is thermodynamically favorable.

B. ΔG is positive and the reaction is NOT thermodynamically favorable.

C. ΔG is negative and the reaction is thermodynamically favorable.

D. ΔG is negative and the reaction is NOT thermodynamically favorable.

8. Which of the following statements regarding the following reaction is true? The cell potential for the reaction is 0.46 V.

A. This reaction can be studied in a galvanic cell because the reaction is thermodynamically favorable.

B. This reaction can be studied in a galvanic cell because the reaction is not thermodynamically favorable.

C. This reaction can be studied in an electrolytic cell because the reaction is thermodynamically favorable.

D. This reaction can be studied in an electrolytic cell because the reaction is not thermodynamically favorable.

9. Which of the following reasons correctly justifies why this thermodynamically favorable reaction does not occur unless a flame is brought to the reactant?