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Is Matter Around Us Pure

Question
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Giving reason, explain which of the following is a physical change.

(i) Electric current is passed through water and hydrogen and oxygen gas are formed.

(ii) Electric current is passed through a bulb and it glows.

Solution

(i) When electric current is passed through water, it break water molecule in hydrogen and oxygen gas. Hence new products are formed whose properties is different from the water, thus it is a chemical change.

(ii) Electric current is passed through a bulb and it glows—is a physical change because when current is stopped, bulb does not glow and no new substance is formed.

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