PPT Slide

Combination and Decomposition Reactions

2Mg(s) + O2(g) ? 2MgO(s)

There are fewer products than reactants; the Mg has combined with O2 to form MgO.

2NaN3(s) ? 2Na(s) + 3N2(g)

(the reaction that occurs in an air bag)

There are more products than reactants; the sodium azide has decomposed into Na and nitrogen gas.

Patterns of Chemical Reactivity

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