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Oink · Answer 1 · 2019-02-23T23:24:25+0000

The reaction is a synthesis…

$4Al + 3O_2 \longrightarrow 2Al_2O_3\\$

… because two substances are combining to make one other substance.

$4\stackrel{\hbox{0}}{\hbox{Al}} + 3\stackrel{\hbox{0}}{\hbox{O}}_2 \longrightarrow 2\stackrel{\hbox{+3}}{\hbox{Al}}_2\stackrel{\hbox{-2}}{\hbox{O}}_3\\$

It is also a reduction-oxidation reaction because the oxidation number of Al increases from 0 to +3 and the oxidation number of O decreases from 0 to -2.

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