The susbstance changes* but matter does NOT change.
Ex: water freezes*, but it is still water
New substances are created and matter changes.
Ex: Wood changes into ashes* and gases when it burns.
TYPES OF CHANGES
- Irreversible: matter CANNOT RETURN to its original state.
- Reversible: matter CAN RETURN to its original state.
*to change: canviar
*to freeze: congelar