AP QUIZZES - AP TOPIC 9 Thermochemistry SET E
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QUESTION 1. Consider the decomposition of solid Calcium carbonate to give Carbon dioxide gas and solid Calcium oxide. What can be deduced about the change in entropy in this reaction?

(A) Nothing
(B) Delta S = 0
(C) Delta S is positive
(D) Delta S is negative
(E) None of the above

QUESTION 2. The equation that represents the standard enthalpy of combustion of propane (C3H8) produces how many moles of products?

(A) 1
(B) 3
(C) 5
(D) 7
(E) 8

QUESTION 3. Which of the following equations represents BOTH the standard enthalpy of formation of zinc oxide, AND the standard enthalpy of combustion of zinc?

(A) Zn(s) + 0.5 O2(g) ==> ZnO(s)
(B) Zn(g) + 0.5 O2(g) ==> ZnO(s)
(C) Zn(s) + O(g) ==> ZnO(s)
(D) Zn(g) + O(g) ==> ZnO(s)
(E) None of the above

QUESTION 4. The standard enthalpies of combustion of methylbenzene (C7H8), Carbon and Hydrogen are -3910, -394 and -286 kJmol-1 respectively. Calculate the standard enthalpy of formation of methylbenzene in kJmol-1.

(A) +3230
(B) +8
(C) -8
(D) -1136
(E) -4590

QUESTION 5. A metal has a specific heat capacity of .899 Jg-1K-1 How much energy is required to raise the temperature of 2.00 kg of the metal by 80 K?

(A) 80 kJ
(B) 35.96 kJ
(C) 179800 kJ
(D) 143.84 J
(E) 143.84 kJ




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