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# practice_exam_2_key - Practice Exam 2 Dr Jessica Parr...

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Practice Exam 2 Dr. Jessica Parr Question Max. Points Score Grader 1 10 2 14 3 12 4 14 5 10 6 6 7 8 8 16 9 10 Total

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1. (10 pts) Circle the correct answers i. 75.0 mL of water is added to 12.9 mL of 0.250 M KMnO 4 . What is the concentration of the new solution. a. 1.70 M b. 1.45 M c. 0.0581 M d. 0.0430 M e. 0.0367 M ii. Of energy, work, enthalpy, and heat, how many are state functions? a. 0 b. 1 c. 2 d. 3 e. 4 iii. Calculate the amount of work associated with the expansion of a gas from 152.0 L to 189.0 L at a constant pressure of 14.0 atm. a. 518 L*atm b. -518 L*atm c. -259 L*atm d. 171 L*atm e. 259 L*atm iv. In the lab, you mix two solutions (each originally at the same temperature) and the temperature of the resulting solution decreases. Which of the following is true? a. The chemical reaction is releasing energy. b. The energy released is equal to the change in temperature. c. The chemical reaction is endothermic. d. The chemical reaction is exothermic e. More than one of these. v. Which of the following does not have a standard enthalpy of formation equal to zero at STP?
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