University of Texas CH 302 McCord H11 - Redox Reactions

University of Texas CH 302 McCord H11 - Redox Reactions -...

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1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points IF the oxidation state oF H is +1 and O is - 2, what is the oxidation state oF C in C 2 H 4 O? 1. +1 2. +2 3. - 2 4. - 1 2 5. - 1 correct Explanation: To calculate oxidation numbers, remember that the the sum oF the numbers must equal the total charge on the molecule or in the case oF neutral species, zero. Let x be the oxidation number oF C. 2 x + 4(+1) + ( - 2) = 0 C 2 H 4 O : 2 x + 2 = 0 2 x = - 2 x = - 1 002 10.0 points What is the oxidation number oF carbon in carbonate? 1. - 2 2. - 4 3. +1 4. 0 5. +3 6. +4 correct 7. - 3 8. - 1 9. +2 Explanation: The carbonate ion is CO 2 - 3 . The oxidation number oF O is usually - 2, so For three O atoms, we obtain - 6. The overall oxidation number must equal the charge on the ion, so C must have an oxidation number oF +4. C - 2 O 3 2 - C - 2 O 3 - 6 2 - C +4 - 2 O 3 - 6 2 - +4 C +4 - 2 O 3 - 6 2 - 003 10.0 points What is the oxidation number oF the noble gas in XeO 3 ? 1. - 4 2. 2 3. - 6 4. 6 correct Explanation: The oxidation number oF halogens is -1 (iF no other halogens are present). The oxidation number oF O is -2 (iF no ± is present). The sum oF all oxidation numbers must equal the sum oF the overall charge oF the species. ±or XeO 3 , 0 = x + 3 ( - 2) +6 = x 004 (part 1 of 2) 10.0 points What is the oxidation number (state) oF Br in the compound HBrO 3 ? Remember that the oxidation state is associated with a sign; e.g. , +1. Correct answer: 5.
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University of Texas CH 302 McCord H11 - Redox Reactions -...

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