Exam 3B Key

Exam 3B Key - Exam lllB CH101 Bigham Spring 2008 Last Name:...

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Unformatted text preview: Exam lllB CH101 Bigham Spring 2008 Last Name: ,First Name unity lD (ex ilsmith2) 1. Please answer the following questions based on the figure below. 35 KJ/mol 20 KJ/mol B A Reaction Coordinate bo li c) 6 f T-l-10 KJ/mol a. What is the activation energy for the reaction of A+B? (2 pts) b. What is the AE for the reaction B+A? (2 pts) E " = KJ/mol o= = -30 KJ/mot c. ls the reaction A+B endothermic or exothermic (assume AS=0)? (1 pt) endothermic exothermic d. Which reaction has a larger rate constant,the forward (A+B) or reyerse (B+A)? (1 pt) forward e. Which reaction has a larger equilibrium constant, the forward (A+B) or reverse (B-+A)? (1 pt) forward 2. Given the following reaction, answer the questions below. (2 pts each) CuGl2(aq) + 2NaOH(aq) <+ Gu(OH)z(s) + 2NaGl(aq) a) lf doubling the concentration of CuClz doubles the rate, and doubling the concentration of NaOH quadruples the rate, what is the rate law expression for the fonrvard reaction: _ .7 * = *, . t&rCQ.-l f Nlo O HJ - b) Write out the equilibrium constant for this reaction: 7 il For the following reaction, Hz(g) + coz(g) > Hzo(g) + Co(g) a) Calculate AH from bond dissociation energies. (4 pts) A H = For questions b-d, CIRCLE the correct answer. (1 pt each) b) What is the sign of the change in entroov? Large & Positive Large & Negative c) What is the sign of AG for the forward reaction? Negative Temperature will have a LARGE This reaction will be extensive or + 3 6 KJ d) e) Zero t room temperature?...
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Exam 3B Key - Exam lllB CH101 Bigham Spring 2008 Last Name:...

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