IN COLLECTION

Oxidation – Reduction Reactions

For #s 1 – 6, consider each of the following atom/ion pairs and indicate how many electrons have been gained or lost, balance the reaction if necessary, and tell if that represents oxidation or reduction:

1) Mn+7 ? Mn+2

2) Cl2 ? Cl-

3) Fe+2 ? Fe+3

4) S-2 ? S

5) Cu+ ? Cu+2

6) Br- ? Br2

For #s 7 – 10: (1) assign oxidation numbers to each atom in the following reactions; (2) write the oxidation and reduction half reactions; (3) identify the oxidizing agent & reducing agent.

7) Zn(s) + Cu2+(aq) ? Zn+2(aq) + Cu(s)

oxidation half reaction:

reduction half reaction:

oxidizing agent:

reducing agent:

8) Cl2(g) + 2Br-(aq) ? 2Cl-(aq) + Br2(s)

oxidation half reaction:

reduction half reaction:

oxidizing agent:

reducing agent:

9) Mg(s) + Ca2+(aq) ? Mg+2(aq) + Ca(s)

oxidation half reaction:

reduction half reaction:

oxidizing agent:

reducing agent:

10) Fe(s) + Ni3+(aq) ? Fe+2(aq) + Fe(s)

oxidation half reaction:

reduction half reaction:

oxidizing agent:

reducing agent:

11) SO2(g) + H2O(l) ? H2SO4(aq)

oxidation half reaction:

reduction half reaction:

oxidizing agent:

reducing agent:

12) NO(g) + H2O(l) ? HNO3(aq)

oxidation half reaction:

reduction half reaction:

oxidizing agent:

reducing agent:

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