June 2018 NY Regents Chemistry Exam
48 Given the balanced ionic equation representing a reaction:
Cu(s) + 2Ag+(aq) → Cu^2+(aq) + 2Ag(s)
During this reaction, electrons are transferred from
(1) Cu(s) to Ag+(aq)
(2) Cu^2+(aq) to Ag(s)
(3) Ag(s) to Cu^2+(aq)
(4) Ag+(aq) to Cu(s)
Solution: According to the reaction, Cu becomes Cu^2+ which means it loses 2 electrons. Ag+ becomes Ag which means it gains an electron. The electrons must be traveling from Cu to Ag+
Answer: 1
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