Silver tarnish is the result of the oxide on the silver surface reacting with hydrogen sulfide (H2S) in air. This leaves a black film of silver sulfide (Ag2S). Polishing the tarnished silver will restore the shine but at the expense of some of the silver metal. An alternative process is to allow aluminum to reduce the silver in the presence of a solution of sodium bicarbonate (baking sodium) electrolyte. 2.    Assume that Aluminum and Silver Sulfide are the starting substances (reactants) in the reaction: A)  Write a balanced chemical equation describing the ”re-creation” of silver, using the information in the case study. B) State the names of the products that are produced from this reaction. C) What type of reaction(s) is/are being represented by the chemical reaction you wrote in part (a)? D) Is the reaction in part (a) an oxidation-reduction (redox) reaction? E) If this is a redox reaction, then identify the following: What is undergoing oxidation (what is being oxidized)? Support your answer using oxidation numbers. What is undergoing reduction (what is being reduced)? Support your answer using oxidation numbers. What is the reducing agent? What is the oxidizing agent?

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Silver tarnish is the result of the oxide on the silver surface reacting with hydrogen sulfide (H2S) in air. This leaves a black film of silver sulfide (Ag2S). Polishing the tarnished silver will restore the shine but at the expense of some of the silver metal. An alternative process is to allow aluminum to reduce the silver in the presence of a solution of sodium bicarbonate (baking sodium) electrolyte.

2.    Assume that Aluminum and Silver Sulfide are the starting substances (reactants) in the reaction:

A)  Write a balanced chemical equation describing the ”re-creation” of silver, using the information in the case study.

B) State the names of the products that are produced from this reaction.

C) What type of reaction(s) is/are being represented by the chemical reaction you wrote in part (a)?

D) Is the reaction in part (a) an oxidation-reduction (redox) reaction?

E) If this is a redox reaction, then identify the following:

  • What is undergoing oxidation (what is being oxidized)? Support your answer using oxidation numbers.
  • What is undergoing reduction (what is being reduced)? Support your answer using oxidation numbers.
  • What is the reducing agent?
  • What is the oxidizing agent?
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