Substances turn into new ones.
Substances don’t turn into new ones.
Solubility
Chemical stability
It is studied by the branch of science called Physics.
Density
The nature of the substances changes.
Elasticity
Enthalpy of formation
In general, we can recover the original substances.
Boiling and melting points
Color
They can occur at macroscopic or microscopic level.
Radioactivity
The nature of the substances doesn’t change.
Oxidation
Toxicity
Substances change the form but not its chemical composition.
Mass
Substances change the form and its chemical composition.
Heat of combustion
It is studied by the branch of science called Chemistry.
There are changes at a microscopic level.
Usually, the original substance cannot be recovered.
