Redox Reactions

For example, CuO(s) + H2(g) Cu(s) + H2O(l)

Redox in terms of Electron Transfer

Consider the following reaction:

Mg(s) + Cl2(g) MgCl2(s)

  1. Oxidation reaction:     The magnesium is losing electrons:

    Mg Mg2+ + 2e-

  2. Reduction reaction:     The chlorine is gaining electrons:

    Cl2 + 2e- 2Cl-

Oxidation Numbers

Useful books for revision:

Revise AS Chemistry for Salters (Written by experienced examiners and teachers of Salter's chemistry)
Revise AS Chemistry for Salters (OCR) (Salters Advanced Chemistry)