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University of Texas CH 302 McCord H11 - Redox Reactions

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

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byrne (cmb3744) – H11: Redox Reactions – mccord – (51620) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points 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 10.0points 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 10.0points 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 F is present). The sum of all oxidation numbers must equal the sum of the overall charge of the species. For XeO 3 , 0 = x + 3 ( - 2) +6 = x 004(part1of2)10.0points 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.

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

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