Differentiate between physical and chemical change.
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Sl. No.
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Differentiatin Property
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Physical Change
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Chemical Change
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1.
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Explanation
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In a physical change, the molecules are rearranged while their actual composition remains same.
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In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.
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2.
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Example
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Some example of physical change are freezing of water, melting of wax, boiling of water, etc.
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A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
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3.
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Reversibility
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Physical change is easily reversible i.e original substance can be recovered.
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Chemical change is irreversible i.e. original substance cannot be recovered.
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4.
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Formation of new substance
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In physical change, no new substance is formed.
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A chemical change is always accompanied by one or more new substance(s).
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5.
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Type of Change
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Physical change is a temporary change.
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Chemical change is a permanent change.
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6.
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Energy Production
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In a physical change, no energy is produced.
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In a chemical change, energy is produced (heat, light, sound, etc.)
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7.
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Absorption of Energy
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Physical change involves very little to no absorption of energy.
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During chemical reaction, absorption and evolution of energy takes place.
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8.
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Affects
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Physical change affects only physical properties i.e. shape, size, etc.
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Chemical change both physical and chemical properties of the substance including its composition.
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