Why do we separate substances?

The best way to carry out the filtration of the mixture of water and sand is to use filter paper not cloth, why?

You have given a solution of substance X. How will you test whether it is saturated or unsaturated? When a hot saturated solution of a substance is allowed to cool, then what will you get?

Why do we need to separate different components of a mixture? Give two examples.

A mixture of wheat grains and wheat flour can be separated by sieving.

Water can be separated from salt by evaporation.

A mixture of oil and water can be separated by filtration.

Grain and husk can be separated by the process of decantation.

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

How chalk powder can be separate from a mixture of chalk powder and water?

Write one purpose of separating substance from a mixture.

When a hot saturated solution is heated, crystals will be formed. Is it correct? If no, correct the statement.

Give one example of sieving used in everyday life.

Ashraf's grandmother is a diabetic patient. Her doctor advised him to control your sugar level in diet by taking less sugar and less fat content. So, she always prefer to take lassi instead of milk. Ashraf asked her mother then she explained the process of making lassi by removing cream from the curd. She told him this method is known as churning.
Read this passage and answer the following questions:
(a) Explain the process of churning.
(b) What is the purpose of this method?
(c) What values are shown by Ashraf?

Read the story titled 'Wise Farmer' and tick the correct option to complete the story.
A farmer was sad/happy to see his healthy wheat crops ready for harvest. He harvested the crops and left it under the sun/rain to dry the stalks. To separate the seeds from the bundles of the stalk, he handpicked/threshed them.
After gathering the seed grains, he wanted to separate the stones and husk from it. His wife winnowed/ threshed them to separate the husk and later sieved/ handpicked to remove stones from it. She ground the wheat grains and sieved/filtered the flour. The wise farmer and his wife got a good price for the flour. Can you tell why?

During summer, Boojho carries water in a transparent plastic bottle to his school. One day, he left his bottle in the school. The bottle still had some water left in it. The next day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half-filled with water. Which method would you use to get back solid copper sulphate from the solution?

While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?

Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?

Paheli bought some vegetables such as french beans, lady's finger, green chillies, brinjals and potatoes all mixed in a bag. Which of the following methods of separation would be most appropriate for her to separate them?

Rice flour mixed with kidney beans

Lady's finger mixed with french beans

Salt mixed with water

Iron powder mixed with flour

Oil mixed in water

Husk from wheat flour is generally removed by ____________________

________________are obtained from stalks by threshing.

Small pieces of stones can be removed from rice by__________________

The method of separating seeds of paddy from stalks is called__________________

Insects can be separated from wheat by __________________