This is a sample test he gave us to take before the first exam. He originally highlighted all of the correct
answers but that defeats the purpose of taking the test, so I put all of the correct answers at the bottom of
the test instead. Good luck!
Exam 2 – ANSWER KEY TOTAL POINTS = 98
General Chemistry Spring 2011
1. Entropy is:
a) a measure of spontaneity in a system
b) a measure of the possible arrangements of a system
c) the sum of heat and work
d) all of the above
2. Enthalpy is:
a) a measure of spontaneity in a system
b) a measure of the possible arrangements of a system
c) the sum of heat and work
d) none of the above
3. A reaction will be spontaneous when:
a) deltaS(sys) is positive
b) deltaS(surr) is positive
c) either (a) or (b)
d) none of the above
4. In the reaction:
Ba(OH)2 8H2O (s) + 2 NH4NO3 (s) à Ba(NO3)2 (aq) + 2 NH3 (g) + 10 H2O(l) the reaction entropy is
expected to:
a) increase
b) decrease
c) remain unchanged
d) there is too little info to tell
5. If deltaG = 0 for a system then
a) deltaS(total) > 0
b) deltaS(total) < 0
c) the system is at equilibrium
d) the temperature of the system is 0 K.
6. Which of the below reactions corresponds to the definition of C-H bond enthalpy?
a) C + H --> C-H
b) 1/4 [CH4 --> C (g) + 4H (g)]
e) 1/4 [C(graphite) + 2 H2 (g) --> CH4]
f) 1/4 [CH4 --> C(graphite) + 2 H2 (g) ]
7. Which statement below is false?
a) The ideal gas law shows the mathematical relationship between pressure, volume, temperature and
moles of gas.
b) The pressure of a gas in a closed container will increase if the temperature is increased.
c) The volume of 1.0 mole of a gas at 1 bar pressure and 25 deg C will depend on how many atoms are in
