Any change in the physical properties of an object without altering the chemical makeup of it.
- evaporation
- water freezing (ice)
- ice melting
- weathering
- erosion
- condensation
- mixing
- dissolving
- cutting a tree down
- shaping of raw materials into products
A usually irreversible change in the arrangement of atoms in an object.
- rusting
- combustion (burning)
- cooking
- oxidation
- ripening (i.e. fruits and vegetables)
- decomposition
- neutralization
- consuming food
- various biological processes (i.e. photosynthesis)
- growth