Question

why do we need to separate subtances?​

Answer 1

Answer:

When two or more substances are mixed together they form a mixture. Components of a mixture should be separated because some components may not be useful or may spoil the useful component of the mixture.

Answer 2

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We need to separate the substances for various reasons like:

• To remove the undesirable and harmful components.

☛ For example – Small pieces of stones and unwanted seed grains are removed from rice and pulses before cooking.

• To remove the impurities as to obtain pure sample of a substance.

☛ For example – Impurities are removed from substances to make them pure as many pure substances are needed in medicines, research and so on.

• To separate useful components of a mixture so that each component can be properly used.

☛ For example – From the crude petroleum , useful components that are needed in our daily life like petrol, diesel, kerosene and many more are separated.

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Extra Information:

Some methods of separation:

• Sieving

☛ This method is used when the size of particles of different components of a mixture is different.

• Winnowing

☛ This method is used when there is a difference in weights of the components of a mixture.

• Magnetic separation

☛ This method is used when we have two separate magnetic component of a mixture from non magnetic components.

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