differentiate between physical and chemical changes
Answers
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition
Answer:
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Explanation:
Physical 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:Physical change is a temporary change.
A chemical change is a permanent change.
Physical 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
Physical Change;A physical change involves very little to no absorption of energy
During a chemical reaction, absorption and evolution of energy take place.
Physical Change:Some example of physical change is 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.
Physical Change: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.)
Physical Change: 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.