Differentiate between physical and chemical change.
In points
Answers
Explanation:
Differences Between Physical and Chemical Change
When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.
When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
Physical change is a temporary change. A chemical change is a permanent change.
A Physical change affects only physical properties i.e. shape, size, etc.
Chemical change both physical and chemical properties of the substance including its composition.
A physical change involves very little to no absorption of energy.
During a chemical reaction, absorption and evolution of energy take place.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.
A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
Generally, physical changes do not involve the production of energy. Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)
In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s).
Physical change is easily reversible i.e original substance can be recovered.
Chemical changes are irreversible i.e. original substance cannot be recovered.
Differentiate b/w Physical and Chemical Change.
ANSWER
Physical Change
1. Change that occurs without a
change in chemical composition.
2. No new substance is formed only
the state changes
3. It is a temporary process.
E.g. Change of state ice to water to gas
Chemical Change
1. Chemical change brings difference in chemical properties.
2. New substance are formed.
3. It is a permanent process.
E.g. Burning