exam 2B 2-27-07 VERSION A answers

exam 2B 2-27-07 VERSION A answers - Mid-Term Exam 2, 3-2-07...

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1 Mid-Term Exam 2, 3-2-07 VERSION A 1. The plot below shows the concentration versus time for the following reaction 2NO 2 (g) 2 NO(g) + O 2 (g) The instantaneous initial rate of this reaction has a value of a) 2.4 × 10 -5 M/s b) 8.6 × 10 -6 M/s c) less than 8.6 × 10 -6 M/s d) 1.2 × 10 -5 M/s e) greater than 1.2 × 10 -5 M/s answer 2. Batteries that provide power for surgical heart pacemaker implants are designed to operate for a period of 15-20 years. These batteries are composed of a) An LiC 6 cathode and a LiCoO 2 anode b) A LiCoO 2 cathode and a LiC 6 anode c) A Li cathode and an I 2 anode d) An I 2 cathode and a Li anode answer e) None of the above

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2 3. The reaction of nitric oxide with hydrogen at 1280°C is: 2 NO( g ) + 2 H 2 ( g ) N 2 ( g ) + 2 H 2 O( g ) Based on the following table of data, what is the rate law for this reaction? a) Rate = k[NO][H 2 ] b) Rate = k[NO][H 2 ] 2 c) Rate = k[NO] 2 [H 2 ] answer d) Rate = k[NO] e) None of the above 4. The value of the rate constant for the reaction shown above is a) 250 s -1 b) 125 L mol -1 s -1 c) 250 L 2 mol -2 s -1 answer d) 125 L 2 mol -2 s -1 e) 1.26 × 10 -6 L mol -1 s -1 5. The membranes of cells found in muscle tissue can transport K + ions through the cell walls. However, the concentration of K + inside of a cell is more than 50 times greater than the concentration of K + found in the fluids surrounding a cell. Which of the following best describes how a living cell maintains a higher concentration of K + inside of the cell than the surrounding fluids? a) The channel proteins that allow K + to pass have one-way gates so that only the inward flow of K + is possible. b) The fluid within a cell is very polar water while the fluid outside of a cell is mostly non-polar fats in which K + is not soluble c) The concentration of Na + in the fluids surrounding a cell is so large that it prevents additional positive ions from dissolving outside of the cell
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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exam 2B 2-27-07 VERSION A answers - Mid-Term Exam 2, 3-2-07...

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