Understanding Reduction Half-Reaction in Chemistry
Which equation is a reduction half-reaction that is written correctly?
A. Zn2+(aq) + e– → Zn(s)
B. Be2+(aq) + 2e– → Be(s)
C. 2Cl–(aq) → Cl2(g) + 2e–
D. Au(s) → Au3+(aq) + 3e–
Answer:
The correct answer is B.
Reduction reaction involves the addition of electrons. In the given options, we need to identify the correct reduction half-reaction that is written accurately.
Option A involves Zn2+ accepting 1 electron to form Zn, but the correct ion should be neutral Zn, so option A is rejected.
Option C shows the formation of Cl2 gas without the addition of electrons, so it is also rejected.
Option D displays the reduction of Au(s) to Au3+(aq) without the correct number of electrons added, making it an incorrect representation of a reduction half-reaction.
Finally, option B correctly illustrates Be2+ gaining 2 electrons to become Be(s), making it the accurate reduction half-reaction in the given choices.
Understanding reduction half-reactions is crucial in electrochemistry as they describe the transfer of electrons during redox reactions. By identifying the correct reduction reactions, we can balance equations and predict the behavior of chemicals in various reactions.