1. Why do we need to separate different components of a mixture? Give two examples.
Answer:
The following are reasons:
- To separate harmful or non-useful component from the mixture; For example, We separate stones from rice.
- To separate two or more useful components from the mixture; For example, separating butter from milk.
- To remove impurities; for example, sperate tea leave
2. What is winnowing? Where is it used?
Answer:
- Winnowing is a method of separation of lightweight and heavyweight components from the mixture to the mixture by the wind.
- For example, Farmer separates heavier seeds of harvested crops by the winnowing process.
3. How will you separate husk or dirt particles from a given sample of pulses before cooking.
Answer:
- By sedimentation and decantation process, we separate husk or dirt particles from the pulse.
- While washing pulses, pure and heavy pulse settles down by sedimentation process and when water along with husk and dirt is separated out by decantation process.
4. What is sieving? Where is it used?
Answer:
- In the sieving process, we allow finer particles to pass through holes and bigger impurity remains in the sieve.
- Sieving process, we use to remove husk and stone from flour.
5. How will you separate sand and water from their mixture?
Answer:
We can separate sand and water from the mixture by two processes:
- Sedimentation and decantation process
- Filtration process
6. Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Answer:
- Yes, by the sieving process we can separate sugar from wheat flour. As sugar particles are larger in size and they will remain in the sieve.
7. How would you obtain clear water from a sample of muddy water?
Answer:
By the Sedimentation, decantation, and filtration process we can obtain clear water from muddy water.
The following will be steps:
- First, take the muddy water in a larger vessel and let the impurity settle down in the botton[ process is called sedimentation]
- In the second step, tilt the water without disturbing the bottom and take out the upper water to another vessel[ process is called decantation]
- In the third step, use a cloth or filter paper and pour the separated water into it.
- Repeat the step third, two-three times.
- Clearwater will come out from muddy water.
8. Fill up the blanks
(a) The method of separating seeds of paddy from its stalks is called __Threshing_________.
(b) 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 __filtration_________.
(c) Salt is obtained from seawater by the process of _____evaporation______.
(d) 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_____.
9. True or false?
(a) A mixture of milk and water can be separated by filtration.[ False]
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing. [ False]
(c) Separation of sugar from tea can be done with filtration. [ False]
- We should add ice after dissolving sugar; As warm water has more space between the water particle, it will help to absorb more sugar.
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