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Question

Differentiate between a physcial change and a chemical change. Give examples to substantiate your answer. [5 MARKS]

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Solution

Reasoning out with examples: 5 Marks



PhysicalChemicalComposition of the substance does notComposition of the substance changes.changeMost changes are reversibleMost changes are irreversibleNo new substances are formed, e.g,New substances are formed, e.g,IceWaterSteamBurning of PaperAshesFor example, melting of ice, dissolving salt inFor example, rusting of iron, decay of foodwaterIt takes place without much changeCan be confirmed by any or all of the followingobservations:change in statechange in colourchange in temperatureevolution of gasPhysical changes are those changes whichChemical changes involve change in chemicalinvolve change in only physical properties like,properties of the substances and change incolor, size, shape and state of substances etc.chemical composition also



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