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 Answers to the examples are: 1.) **2H2(g) + O2(g) > 2H2O(g)** A **synthesis ** (or combination) reaction.

2.) **2Ag2O(cr) > 4Ag(cr) + O2(g)** A **decomposition ** reaction.

3.) **H2SO4(aq) +2NaOH(aq)** > Na2SO4(aq) + 2H2O(l) A **double-displacement** reaction.

4.) **CH4(g) + 2O2(g) > 2H2O(g) + CO2(g)** A **combustion ** reaction.  