Final answer:
The reaction shown is a decomposition reaction, where a compound breaks down into simpler substances.
Step-by-step explanation:
The reaction shown, 2KClO3(s) → 2KCl(s) + 3O2(g), is an example of decomposition reaction. Decomposition reactions involve the breaking down of a single compound into two or more simpler substances. In this reaction, the compound potassium chlorate (KClO3) decomposes into potassium chloride (KCl) and oxygen gas (O2).