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Answer Key for D2L Assignment #1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Q1 Consider the following reaction 8A( g ) + 5B( g ) 8C( g ) + 6D( g ) If [C] is increasing at the rate of 4.0 mol L -1 s -1 , at what rate is [B] changing? 1) -2.5 mol L -1 s -1 Feedback: Difficulty: M 2) -0.40 mol L -1 s -1 Feedback: Difficulty: M 3) -4.0 mol L -1 s -1 Feedback: Difficulty: M 4) none of the above, since its rate of change must be positive Feedback: Difficulty: M 5) -6.4 mol L -1 s -1 Feedback: Difficulty: M ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Q2 The rate constant for a reaction is 4.65 L mol -1 s -1 . What is the overall order of the reaction? 1) More information is needed to determine the overall order. Feedback: Difficulty: M 2) second Feedback:

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Difficulty: M 3) third Feedback: Difficulty: M 4) first Feedback: Difficulty: M 5) zero Feedback: Difficulty: M ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Q3 When the reaction A B + C is studied, a plot of ln[A] vs. time gives a straight line with a negative slope. What is the the order of the reaction? 1) zero Feedback: Difficulty: E 2) More information is needed to determine the order.
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