Answer to Question #161965 in General Chemistry for AMY

Question #161965

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.

Expert's answer

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-

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