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H11_Redox Reactions

H11_Redox Reactions - krohn(tek335 H11 Redox Reactions...

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krohn (tek335) – H11: Redox Reactions – Mccord – (52445) 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 10.0 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 correct 2. - 1 2 3. +2 4. - 2 5. +1 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. +4 correct 2. - 3 3. - 4 4. +3 5. - 2 6. - 1 7. 0 8. +2 9. +1 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 4 - 6 ? 1. 8 correct 2. - 2 3. - 6 4. - 3 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 4 - 6 , - 4 = x + 6 ( - 2) +8 = x 004 (part 1 of 2) 10.0 points What is the oxidation number (state) of S in the compound H 2 SO 3 ? Remember that the oxidation state is associated with a sign; e.g. , +1.

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H11_Redox Reactions - krohn(tek335 H11 Redox Reactions...

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