Hi, Im new! But, why is physical and chemical changes are different?

Physical and chemical changes are different because one deals with changes to ones shape or form, while chemical is changing one substance to another.

Explanation:

A example of a physical change would be cutting a block of wood into a cube of would, its physical change changes from a block to a cube. A chemical change is changing the substance into another substance so for example, burning that cube of wood in a fire. The fire is burning the wood into ash meaning it's no longer wood but ash.

Hope this helps.

dynamic equilibrium is the answer.