Question 3: Electrochemical Coll (15 points) A high school girl was getting ready for a big date but discovered with horror that her silver neckli
was tarnished. Having just studied about redox reactions and electrochemical cells in chemistry
class, she grabbed some aluminum foil, put it in a dish, and placed her necklace on top of the foi
Then she added some baking soda, a little salt, and hot water. Within a few minutes, her necklace
was bright and shiny again
The formula for silver tarnish is AgzS. Use the balanced equation to answer the following question
3A52S + 2Al(s) → A12S3 + 6Ag(s)
a. What makes this an oxidation-reduction reaction? (1 point)
b. Write the half-reactions showing the oxidation and reduction reactions. Identify which is the
oxidation reaction and which is the reduction reaction (3 points)
c. What is oxidized in the reaction? What is reduced? (2 points)