Chemical and Physical changes
Chemical changes are when:
A new substance is formed
A colour change is observed
A gas is released
A solid is formed
Light is produced
Heat is produced
Electricity is produced
Irreversible
e.g. Combustion, decomposition, displacement, etc
Physical changes are when:
No new substance is formed
The reaction is easily reversible
Temporary Change
e.g. Melting, freezing, evaporation, etc
A new substance is formed
A colour change is observed
A gas is released
A solid is formed
Light is produced
Heat is produced
Electricity is produced
Irreversible
e.g. Combustion, decomposition, displacement, etc
Physical changes are when:
No new substance is formed
The reaction is easily reversible
Temporary Change
e.g. Melting, freezing, evaporation, etc