When solid potassium chlorate is heated it produces solid potassium chloride and diatomic oxygen gas.

$($a$)$ Write and balance the molecular equation for this reaction. Show the phase $($aq$,$ s$,$ l$,$ or g$)$ of all reactants and products. $(3$ marks$)$

$($b$)$ Classify this reaction in as many ways possible. $(1$ mark$)$

OPTIONS: single replacement, double replacement, decomposition, combination$/$synthesis$,$ combustion reaction.