# Potassium chlorate decomposes to potassium chloride and oxygen gas. Is this a physical or chemical change?

Nov 2, 2016

This process is clearly an example of chemical change.

#### Explanation:

Chemical change is characterized by the formation of new substances, and the making and breaking of strong chemical bonds.

Here, we have the reaction:

$K C l {O}_{3} \left(s\right) + \Delta \rightarrow K C l \left(s\right) + \frac{3}{2} {O}_{2} \left(g\right) \uparrow$

This reaction works best with a little $M n {O}_{2}$ catalyst. Clearly, strong chemical bonds have been broken, and reformed in new substances.