|
State
|
Volume
|
shape
|
Force
|
|
Solid
|
Fixed
|
Fixed
|
Strong
|
|
Liquid
|
Fixed
|
Not fixed
|
Weak
|
|
Gas
|
Not fixed
|
Not fixed
|
No force
|
Two types of changes occur when substances are heated:
- Physical ( non-permanent) change
- Chemical change (permanent) change
- Physical change
A physical change is a change which is easily reversible and in which no new substance is formed. Examples include:
- The melting of ice
- The melting of candle wax
- Blowing a balloon
- Magnetization of iron
- Chemical change
A chemical change is a change which is not easily reversible and in which a new substance formed. Examples include:
- Burning of a piece of paper or firewood
- The rusting of iron
- The heating of sugar
- Action of heat on zinc carbonate
- Burning of magnesium
