is breathing physical or chemical change ?
Breathing is a chemical change,
Fireworks going off is an Chemical change
Boiling water added to instant coffee is a physical change because the chemical makeup is not changing.
A plant making food by photosynthesis is a Chemical change.
The key point about physical and chemical changes is.
A Chemical change is one that is near impossible to change back. It only occurs when a new substance is produced or the original substance disappears.