Ni s ni2aq 2e 5 a which is the cathode silver b which

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Ni (s)--> Ni2+(aq) + 2e
5. a) Which is the cathode
b) Which half reaction occurs at the cathode
c) Write the half reaction occurring on the cathode .
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6. Write the complete oxidation-reduction reaction for the removal of silver tarnish in this experiment. ( Hint: combine the oxidation and reduction half reactions above )
7. a) Which reactant is the reducing agent (the one giving up the electrons) in the reaction above?
b) Which reactant is the oxidizing agent (the one accepting the electrons) in the reaction above?
c) Which reactant became oxidized ? _________ d) Which reactant became reduced ? __________ 8. Describe the appearance of your silver item after tarnish removal as compared to its appearance before tarnish removal.
9. Examine the aluminum foil. Describe any change in its appearance compared to an unused aluminum foil. Give a chemical reason, if any for the observed change in appearance.
10. There are silver cleaning kits that work “magic” by using a platter. The silver to be cleaned has to make contact with this platter. What do you suppose the platter is made from?
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