Write an activity to show a chemical change.

Give reasons for the following:

Rusting is seen mostly during the rainy season.

Give reason for the following:

Explosion of crackers is a chemical change.

Give reason for the following:

Carbon dioxide turns lime water milky.

Give reason for the following:

Baking soda fizzes with vinegar.

Give reason for the following:

A shiny copper object turns green after sometime.