Answer:
Step-by-step explanation:
Exploding Firecracker - Chemical Change
Mowing Grass - Physical Change
Breaking a Window - Physical Change
Spreading butter on toast - Physical Change
burning wood in a fireplace - Chemical Change
acid rain corroding gravestones: Chemical Change
In a physical change, the chemical composition is not altered, easily reversible and no new substance is formed.
In a chemical change, the chemical composition of the substance is altered. Not reversible and a new substance is always formed at the end of the reaction.