AP QUIZZES - AP TOPIC 9 Thermochemistry SET C
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QUESTION 1. Which of the following changes involves the largest increase in entropy?

(A) Bromine liquid being evaporated to give Bromine gas
(B) Graphite being turned into Diamond
(C) Water being to 320 K
(D) Dissolving a soluble salt
(E) Water being frozen

QUESTION 2. The standard enthalpy change for the formation of sulfur dioxide is = Q kJmol-1. The standard enthalpy change for the formation of sulfur trioxide is = R kJmol-1. What would be the enthalpy change for the reaction of two moles of sulfur dioxide with oxygen to produce two moles of sulfur trioxide?

(A) Q - R
(B) R - Q
(C) 2Q - R
(D) 2Q - 2R
(E) 2R - 2Q

QUESTION 3. The Bond Energy terms for H-H, Cl-Cl and H-Cl are 440, 240 and 430 kJmol-1 respectively. Calculate the Delta H for the reaction between hydrogen and chlorine gas to produce two moles of hydrogen chloride gas.

(A) -860
(B) -620
(C) -440
(D) -180
(E) +240

QUESTION 4. Which of the following ionic substances would have LEAST agreement between theoretical and experiemntal values of Lattice Enthalpies?

(A) NaCl
(B) MgCl2
(C) AlCl3
(D) RbCl
(E) KCl

QUESTION 5. When burning a solid hydrocarbon, which set of values would be most likely?

(A) Negative Delta H, Negative Delta S, Negative Delta G
(B) Negative Delta H, Negative Delta S, Positive Delta G
(C) Negative Delta H, Positive Delta S, Negative Delta G
(D) Positive Delta H, Negative Delta S, Negative Delta G
(E) None of the above




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