winter 07 exam 2

winter 07 exam 2 - CHEM 102 Winter 07 Exam 2 On the answer...

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CHEM 102 Winter 07 Exam 2 On the answer sheet (scantron) write your Name, Student ID Number, and Recitation Section Number. Choose the best (most correct) answer for each question AND ENTER IT ON YOUR ANSWER SHEET. 1. The simplest explanation for the unusual properties of water in comparison to other compounds of similar structure and molar mass is a. hydrogen bonding. b. covalent bonding. c. trigonal pyramidal structure. d. London forces. ANSWER: a 2. In face-centered cubic unit cells, ___ of the atom on each face of the unit cell is counted as part of that unit cell. a. all b. none c. 1/2 d. 1/8 ANSWER: c 3. In an n-type semiconductor the charge carriers are the _________ because __________. a. holes; electrons move to fill a hole, thus leaving a hole elsewhere b. holes; there are extra electrons that can move freely c. nuclei; they are not locked into one location d. electrons; there are extra electrons that move freely ANSWER: d 4. For the reaction, 2 C 4 H 10 (g) + 13 O 2 (g) 8 CO 2 (g) + 10 H 2 O(g) a. [] t H C rate Δ Δ = 10 4 13 1 b. [] t H C rate Δ Δ = 10 4 10 1 c. [] t H C rate Δ Δ = 10 4 2 1 d. [] t H C rate Δ Δ = 10 4 2 1 ANSWER: c
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5. For the rate law, rate = k[NO 2 ] 2 [O 2 ], what is the overall order of the reaction? a. 2 b. 3 c. 1 d. cannot be determined ANSWER: b 6. The reaction of CO(g) and NO 2 (g) is second order in NO 2 (g) and zeroth order in CO(g). Which of the following is the correct rate law? a. Rate = k [NO
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winter 07 exam 2 - CHEM 102 Winter 07 Exam 2 On the answer...

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