AP Chem Chapter 16 Practice Quiz

AP Chem Chapter 16 Practice Quiz

AP Chem Chapter 16 Practice Quiz

1. Which statement is FALSE?

a) If a reaction is thermodynamically spontaneous, it may occur rapidly.

b) A fast reaction may be thermodynamically spontaneous.

c) If a reaction is thermodynamically spontaneous, it may occur slowly.

d) If a reaction is thermodynamically spontaneous, it must have a low activation energy.

e) Rate of reaction is a kinetic quantity rather than a thermodynamic quantity.

2. Which of the following is a kinetics concept?

a) free energy

b) enthalpy

c) spontaneity

d) reaction mechanism

e) entropy

3. A catalyst

a) is used up in a chemical reaction

b) changes the value of Δ G of the reaction

c) is always a solid

d) does not influence the reaction in any way

e) changes the activation energy of the reaction

4. What is the entropy change of the reaction below at 298K and 1 atm pressure?

N2(g) + 3H2(g) ----> 2NH3(g)

S(J/mol x K) 191.5 130.6 192.3

a) -198.7 J/K

b) 76.32 J/K

c) -129.7 J/K

d) 303.2 J/K

e) 384.7 J/K

5. If the entropy change for the reaction below at 298 K and 1 atm pressure is 137 J/K, and S=205 J/mol x K for O2(g), what is S for O3(g)?

2O3 ----> 3O2

a) 364 J/mol x K

b) 478 J/mol x K

c) 239 J/mol x K

d) -117 J/mol x K

e) -59 J/mol x K

6. The heat of vaporization of methanol, CH3OH, is 35.20 kJ/mol. Its boiling point is 64.6 degrees Celsius. What is the change in entropy for the vaporization of methanol?

a) -17.0 J/mol x K

b) 3.25 J/mol x K

c) 17.0 J/mol x K

d) 104 J/mol x K

e) 543 J/mol x K

7. Which one on the following reactions has a positive entropy change?

a) H2O(g) ----> H20(l)

b) BF3(g) + NH3(g) ----> F3BNH3(s)

c) 2SO2(g) + O2(g) ----> 2SO3(g)

d) N2(g) + 3H2(g) ----> 2NH3(g)

e) 2NH4NO3(s) ----> 2N2(g) + 4H2O(g) + O2(g)

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