SUPPL INSTR FOR CH 302 (GE 206E) - AnswerstoPPredoxreactions

SUPPL INSTR FOR CH 302 (GE 206E) -...

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Practice Problems: Redox Equations Assume a temperature of 25°C unless stated otherwise. 1. The following redox reaction is used in acidic solution in the Breathalyzer test to determine the level of alcohol in the blood: H + (aq) + Cr 2 O 7 2- (aq) + C 2 H 5 OH(aq) → Cr 3+ (aq) + C 2 H 4 O(aq) + H 2 O(l) (a) Identify the elements undergoing changes in oxidation state and indicate the initial and final oxidation numbers for these elements. (b) Write and balance the oxidation half-reaction. (c) Write and balance the reduction half-reaction. (d) Combine the half-reactions to produce a balanced redox equation. 2. The compound P 4 S 3 is oxidized by nitrate ions in acid solution to give phosphoric acid, sulfate ions, and nitric oxide, NO. Write the balanced equation for each half- reaction and the overall equation for the reaction. 3. Balance each of the following skeletal equations by using oxidation and reduction half-reactions. Identify the oxidizing agent and reducing agent in each reaction:
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SUPPL INSTR FOR CH 302 (GE 206E) -...

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