AP QUIZZES - AP TOPIC 9 Thermochemistry SET D
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QUESTION 1. Consider the reaction profiles below. Which of the reactions have endothermic activation energies?



(A) X only
(B) Y only
(C) Y and Z only
(D) X and Z only
(E) None of the above answers is correct

QUESTION 2. Consider the reaction profiles below. Which of the profiles represents the most exothermic reaction?



(A) X only
(B) Y only
(C) Z only
(D) Y and Z
(E) X and Z

QUESTION 3. Which of the following equations represents the standard enthalpy of formation for Aluminum Chloride?

(A) Al(s) + 3Cl(g) ==> AlCl3(s)
(B) Al(g) + 3Cl(g) ==> AlCl3(s)
(C) Al(s) + 1.5 Cl2(g) ==> AlCl3(s)
(D) Al(s) + Cl2(s) ==> AlCl3(s)
(E) Al(g) + 1.5 Cl2(g) ==> AlCl3(s)

QUESTION 4. What are the signs of Delta H and Delta S for a reaction that is spontaneous at all temperatures?

(A) Delta H positive, Delta S negative
(B) Delta H positive, Delta S positive
(C) Delta H negative, Delta S positive
(D) Delta H negative, Delta S negative
(E) None of the above

QUESTION 5. The standard enthalpies of formation for ethene (C2H4), water (H2O) and ethanol (C2H5OH) are +52, -286 and -277 kJmol-1 respectively. Calculate Delta H for the reaction Ethene + Water ==> Ethanol

(A) +61
(B) -43
(C) -61
(D) -511
(E) -615




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