Question

Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. half-reactionidentification Ni2 (aq) 2e-Ni(s) Zn(s)Zn2 (aq) 2e- (2) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients.

Answer 1

Answer:

Overall balanced redox reaction :

$Ni^{2+} (aq)+Zn(s)\rightarrow Ni(s)+Zn^{2+} (aq)$

Explanation:

$Ni^{2+} (aq) +2e^-\rightarrow Ni(s)$..(1)

$Zn(s)\rightarrow Zn^{2+} (aq) +2e^-$ ..(2)

Oxidation reaction is a chemical  reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.

$X\rightarrow X^{n+}+ne^-$

Reaction number 2 is an oxidation half reaction, in which zinc is loosing 2 electrons and forms zinc ion with +2 charge.

Reduction reaction is a chemical reaction in which an atom gains electrons. Here, the oxidation state of the atom decreases.

$X^{n+}+ne^-\rightarrow X$

Reaction number 1 is a reduction half reaction, in which nickel ion with 2+ charge is gaining 2 electrons and forms nickel atoms.

Overall balanced redox reaction can be written adding (1) and (2):

$Ni^{2+}+ (aq) 2e^-+Zn(s)\rightarrow Ni(s)+Zn^{2+} (aq) +2e^-$

$Ni^{2+} (aq)+Zn(s)\rightarrow Ni(s)+Zn^{2+} (aq)$