Here's what happens:

* Potassium chlorate (KClO3) is a white crystalline solid.

* When heated, it decomposes into potassium chloride (KCl), which is also a white solid, and oxygen gas (O2).

The balanced chemical equation for this reaction is:

2 KClO3 → 2 KCl + 3 O2

This reaction is used in various applications, including:

* Production of oxygen: Potassium chlorate is a common source of oxygen for laboratory experiments and some industrial processes.

* Fireworks and explosives: The decomposition of potassium chlorate releases a large amount of oxygen, contributing to the rapid combustion in fireworks and some types of explosives.

It's important to note that potassium chlorate is a powerful oxidizer and should be handled with caution.