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Unformatted text preview: Quiz 1 Name:
Chem 13, Spring 2010 Fossum
A l[_1=_kt L=L+ld ty=9L6i’).
[A10 [A], [A10 2 k In& = —i) R = 8.314 J/molK
k1 R T1 T2 Always show your work and reasoning, include units, and check signiﬁcant ﬁgures. 1. (3 points) If the temperature of a reaction is increased, what will happen to the rate of the
reaction? Explain the underlying reason(s) for this change, at the molecular level. 2. (6 points) The following initial rate data is given for the hypothetical reaction
3 A + B —> C + 2D E_ a. Determine the rate law for the above reaction. Show your reasoning. b. Determine the value of the rate constant for the above reaction. (4 points) A ﬁrst order reaction has a halflife of 15.8 minutes. How long will it take for
the concentration of the reactant to drop to 30.0% of its original concentration? (7 points) Given the attached graph of the concentration of A vs. time for the reaction:
A + 2 B —> C + D (For each of the following answers, include the appropriate sign.) a. Calculate the average rate of change of [A] from 1.0 to 4.0 hours. b. Calculate the rate of change of [A] at 2.5 hours. c. What is the rate of change of [B] at 2.5 hours? (1. From the graph, estimate the halflife of this reaction and explain your reasoning. Concentration of A, M 00333820: 0." > <m. 23m jam. 30:2... ...
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 Spring '10
 FOSSUM
 Reaction, Chemical reaction

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