Question

which of these is an example of a chemical change?
painting the walls green
removing salt from water using distillation
fireworks exploding
all of these

Explanation:

A chemical change results in new substances being formed. Painting walls is a physical change as it just changes appearance. Distillation to remove salt from water is a physical separation process. Fireworks exploding involve combustion reactions that form new substances like gases and ashes.

Answer:

C. Fireworks exploding