Answered: Fe (aq) (a) Fe(s) + Cu" (aq) (b) Mg(s)…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question

Identify the oxidized reactant, the reduced reactant, the oxidizing agent, and the reducing agent in the following reactions:

Fe (aq)
(a) Fe(s) + Cu" (aq)
(b) Mg(s) + Cl2(8)
(c) 2 Al(s) + Cr,0;(s) → 2 Cr(s) + Al,O;(s)
+ Cu(s)
MgCl2(s)

Expert Solution

Step 1

The electron accepting molecule or ion is known as oxidizing agents. As the electrons are accepted it causes the oxidation of another species. The electron donating species is known as reducing reagents. By donating electron, it causes the reduction of other species.

Step 2

Increase in oxidation number – oxidation

A decrease in oxidation number – reduction

(a)

The oxidation number of Fe increased 0 to +2 i.e. Fe is oxidized. Thus Fe is the oxidized reactant.
The oxidation number of Cu decreased from +2 to 0 i.e. Cu⁺²is reduced. Thus Cu⁺² is a reduced reactant.
The reduction of Cu⁺²to Cu is caused by the Fe. So Fe is the reducing agent.
The oxidation of Fe to Fe⁺² is caused by the Cu⁺². Thus, Cu⁺²is the oxidizing agent.

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