Distinguish between Physical change and chemical change. please answer
Answers
Physical changes only change the appearance of a substance, not its chemical composition. ... Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
Difference Between Physical and Chemical Change
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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.
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Physical change is a temporary change.
A chemical change is a permanent change.
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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
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A physical change involves very little to no absorption of energy.
During a chemical reaction, absorption and evolution of energy take place.
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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.
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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.)
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In a physical change, no new substance is formed.
A chemical change is always accompanied by one or more new substance(s).
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Physical change is easily reversible i.e original substance can be recovered.
Chemical changes are irreversible i.e. original substance cannot be recovered.
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