Answer to Question #161965 in General Chemistry for AMY

Question

1. What is the meaning of a redox reaction?

2. Table 1.5 shows the equations for several redox reactions.

Reaction Chemical equation

I. Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)

II. 2Pb(s) + O2(g) → 2PbO(s)

III. 2Al(s) + 3Cl2(g) → 2AlCl3(s)

IV. Br2(aq) + 2I−(aq) → 2Br−(aq) + I2(aq)

For each of the above redox reaction:

(a) write the half equations for oxidation and reduction.

(b) identify the oxidised substance, reduced substance, oxidising agent and reducing agent.Explain

your answer in terms of the transfer of electrons.

Answer 1

1) An oxidation reduction2Br-(aq) → Br2(l) + 2e- (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron

2)a)Cu(s) → Cu+2. (aq) + 2e-. + 2Ag+.

6 Cl 0 + 6 e - → 6 Cl -I (reduction). 2 Al 0 - 6 e - → 2 Al III ...

2Br-(aq) → Br2(l) + 2e-