Define reduction in terms of electron transfer - Leaving Cert Chemistry - Question 4 - 2009
Question 4
Define reduction in terms of electron transfer.
The diagram shows a piece of zinc in copper sulfate solution.
Initially the zinc is silver-grey and the solution is ... show full transcript
Worked Solution & Example Answer:Define reduction in terms of electron transfer - Leaving Cert Chemistry - Question 4 - 2009
Step 1
Define reduction in terms of electron transfer.
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Answer
Reduction is defined as the gain of electrons by a chemical species during a reaction.
Step 2
Which species has been reduced?
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Answer
The species that has been reduced is extCu2+, as it gains electrons to form extCu.
Step 3
How many electrons were transferred in the reduction?
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Answer
Two electrons were transferred in the reduction process.
Step 4
State any two changes you would observe as the reaction proceeds.
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The blue color of the copper sulfate solution fades as the reaction progresses.
Zinc dissolves and copper precipitates, coating the zinc with a brown (reddish) deposit.
Step 5
What is this list called?
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This list is called the electrochemical series (or activity series).
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