NCERT Class VI Science Solutions: Chapter 5-Separation of Substances Part 2

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NCERT Class 6 Science Chapter 5: Separation of Substances

Question 8:

Fill up the blanks.

  • The method of separating seeds of paddy from its stalks is called ___________.

  • When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ___________.

  • Salt is obtained from seawater by the process of ___________.

  • Impurities settled at the bottom when muddy water was kept overnight in a bucket.

The clear water was then poured off from the top. The process of separation used in this example is called ___________.

Answer:

  • The method of separating seeds of paddy from its stalks is called threshing.

  • When milk, cooled after boiling, is poured onto a piece of cloth the cream (Malai) is left behind on it. This process of separating cream from milk is an example of churning.

  • Salt is obtained from seawater by the process of evaporation.

  • Impurities settled at the bottom when muddy water was kept overnight in a bucket.

The clear water was then poured off from the top. The process of separation used in this example is called sedimentation and decantation.

Question 9:

True or false?

  • A mixture of milk and water can be separated by filtration.

  • A mixture of powdered salt and sugar can be separated by the process of winnowing.

  • Separation of sugar from tea can be done with filtration.

  • Grain and husk can be separated with the process of decantation.

Answer:

  • A mixture of milk and water can be separated by filtration. (False)

  • A mixture of powdered salt and sugar can be separated by the process of winnowing. (False)

  • Separation of sugar from tea can be done with filtration. (False)

  • Grain and husk can be separated with the process of decantation. (False)

Question 10:

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

Answer:

We should add sugar before adding ice. Sugar dissolves in warm water more quickly than in cold water. We can dissolve more sugar before mixing ice in water.

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Mixing Lemon Juice and Sugar in Water

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