Reactions of Copper Post-Lab

Reactions of Copper Post-Lab - Q# Question Text 4) Scoring...

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Q# Question Text 4) Scoring Scheme: 3-3-2-1 In step 1 of the experimental procedure, copper metal is added to concentrated nitric acid. The reaction between copper metal and concentrated nitric acid is an oxidation-reduction reaction that is somewhat complicated. 4 HNO 3 (aq) + Cu(s) => Cu(NO 3 ) 2 (aq) + 2 H 2 O(l) + 2 NO 2 (g) Identify the element or elements that undergo OXIDATION . Your Answer: b. The copper metal is oxidized to copper(II) in Cu(NO 3 ) 2 . You Scored 3 points out of 3 Possible 5) Scoring Scheme: 3-3-2-1 In step 1 of the experimental procedure, copper metal is added to concentrated nitric acid. The reaction between copper metal and concentrated nitric acid is an oxidation-reduction reaction that is somewhat complicated. 4 HNO 3 (aq) + Cu(s) => Cu(NO 3 ) 2 (aq) + 2 H 2 O(l) + 2 NO 2 (g) Identify the element or elements that undergo REDUCTION . Your Answer: c. Nitrogen, in 2 of the 4 moles of HNO 3 , is reduced from +5 to +4 in NO 2 . You Scored 3 points out of 3 Possible 6) Scoring Scheme: 3-3-2-1 In step 1 of the experimental procedure, copper metal is added to concentrated nitric acid. The reaction between copper metal and concentrated nitric acid is an oxidation-reduction reaction that is somewhat complicated. 4 HNO 3 (aq) + Cu(s) => Cu(NO 3 ) 2 (aq) + 2 H 2 O(l) + 2 NO 2 (g) Considering which elements are being oxidized and reduced, determine how many moles of electrons are transferred between the elements being oxidized and reduced. Your Answer:
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This note was uploaded on 04/10/2010 for the course CHE 2a taught by Professor Tingguo during the Winter '08 term at UC Davis.

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Reactions of Copper Post-Lab - Q# Question Text 4) Scoring...

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