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Is Matter Around Us Pure
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.
(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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Which separation techniques will you apply for the separation of the following?
Sodium chloride from its solution in water.
Which separation techniques will you apply for the separation of the following?
Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
Which separation techniques will you apply for the separation of the following?
Different pigments from an extract of flower petals.
Which separation techniques will you apply for the separation of the following?
Butter from curd.
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