Answer:
The word equation is:

This reaction happens when there is the decomposition of hydrogen peroxide into oxygen and water. Thus, the equation would be

Balancing the equation requires to have the same number of atoms of each element on both the side. To balance this equation we need to add 2 water (
) molecules and 2 hydrogen peroxide (
) molecules . As we know, oxygen is naturally diatomic. Thus, the balancing equation would be:
