Changes Around Us

Objectives

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The Students Will be able - To recognize and enlist a few changes that happen in our day-to-day life - To classify the observed changes as, - slow / fast, reversible / irreversible - physical and chemical changes - desirable / undesirable, natural / human made - To explain the process of dissolution - To distinguish between a solvent and a solute

Summary

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- Everything in this world undergoes changes. Changes occur in position, shape, size, state, colour, temperature, composition etc., - Fast change – short period of time Slow change – long period of time - Reversible change – can go back to its original state Irreversible change – cannot go back to its original state - Desirable change - changes that are useful and harmless to our environmental Undesirable change - changes that are harmful to our environment. - Natural change - changes that tak place in nature on their ownHuman made change - changes that are brought about by human beings - A solute when dissolved in a solvent makes a solution. - The process of dissolving the solute in solvent is called dissolution.