A
It is a change of some properties of a material
Physical Change
It is when material is changed into different types of material
Chemical Change
When matter can go back to its original form
Reversible
When matter can not go back to its original form
Irreversible
When matter turns from solid to liquid
Melting
When a substance changes from liquid to gas
Boiling
Below 32ºF (0ºC
Freezing
It is another word for burning
Combustion
Involves a change of temperature
Heating
It happens when there is a decrease in the space matter occupies
Contraction
It happens when there is a increase in the volume matter occupies
Expansion
It is a flammable substance that is easily set on fire
Fuel
The fuel burns slowly without producing any flames
Slow Combustion
The fuel bursts suddenly, producing lots of heat and sound
Explosive Combustion
Material burns by contact with oxygen
Spontaneous Combustion
The fuel burns in a very short time
Rapid Combustion
Some Chemical Changes are:
Burning , Cooking, and Rusting
Some Physical Changes are:
Boiling, Freezing, and Melting
Combustion always need:
oxygen, heat, and fuel
Examples of Combustion
Slow, Rapid, Spontaneous, Explosive