Solution Key for Exam 5 - Introduction to Chemistry | CHEM 100, Exams of Chemistry

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Summer 07 Chem 100 Ch 7-8.6 100 (110 possible) Pts Name For Full Credit, show all of your work work Part 1: Choose the Single closest or best answer. 5 pts each 1. Aprocess or reaction which releases heat to the surroundings is said to be A) conservative. B) endothermic. r exothermic. ) isothermal. E) exergonic. 2. Consider the reaction shown: \ C3Hg + 502 > 3CO. + 4H204 488 kcal tis We can say that this reaction is “and that the sign of AH is per endothermic; positive i 8 exothermic; negative i C) endothermic; negative ele D) exothermic; positive ea E) exothermic; neither positive nor negative 3. Consider the reaction shown: 304.0 kcal + 4PCI3 (I) > Pa(s) + 6 Clo (g) When 50.00 g of PCl3 (m.w. 137.5 g/mol) react, kcal will be A) 27.67; produced B) 304.0; produced ) as oY feo. consumed S.0 eo S$ ——_x« 5 { D) 27.67; consumed | > Y E) 110.7; consumed 4, Areaction that is spontaneous can be described as A) proceeding in both the forward and reverse directions. B) having the same rate in both the forward and reverse directions. t)\ C) releasing heat to the surroundings. proceeding without external influence once it has begun. increasing in disorder. t m%