Test-exam 2

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Unformatted text preview: s. If you decide to change an answer, erase ANY unwanted mark carefully and completely. Any question for which more than one response has been blackened will be counted as wrong. Any question that is unanswered will also be counted as wrong. DO THIS AFTER THE TEST For the answer key, go to WebCT > Chem100A > Exams > Exam_II_Key. This is a 25-question exam. Each question is worth 4 points. Maximum possible points is 100 (=4 x 25) 1 Electrochemistry and Vitamin C 1. The oxidation state of chromium in K 2CrO4 is a. b. c. d. e. –6 –2 0 +2 +6* 2. How many electrons are transferred in the following reaction? 2ClO3 12 H 10 I 5I 2 Cl2 6 H 2O a. 2 b. 5 c. 10* d. 12 e. 30 Ans. One way is to look at this problem is by examining the reaction, 2ClO3 Cl2 . The oxidation state of Cl in ClO3 is +5. The oxidation state of Cl2 is zero. Thus, there is a change of 5 in oxidation state. Including the “2” in front of 2ClO3 Cl2 , the total change is 10. 3. Let the following diagram be a Zn/Cr voltaic...
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