For each item, choose whether the change is a physical change or a chemical change. exploding firecracker:
mowing grass:
breaking a window:
spreading butter on toast:
burning wood in a fireplace:
acid rain corroding gravestones:

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.