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