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

1 Answer
Nov 2, 2016


This process is clearly an example of chemical change.


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

Here, we have the reaction:

#KClO_3(s) + Delta rarr KCl(s) + 3/2O_2(g)uarr#

This reaction works best with a little #MnO_2# catalyst. Clearly, strong chemical bonds have been broken, and reformed in new substances.