How will you separate a mixture of saw dust and sugar?

How is common salt obtained from sea water?

Describe the process of sieving. Write one of its uses.

What is sedimentation? Give an example.

Why do we separate substances?

What happens when sand and powdered leaves are being fallen at the same place?

Name and describe briefly a method which can be helpful in separating a mixture of husk from grains. What is the principle of this method?

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? 

How will you separate sand and water from their mixture?

What is winnowing? Where is it used?

Raghav is given a glass bottle with some white substances in it that is either chalk or sugar. How can be find out which of the two is sugar or chalk, without tasting it.

If you are given two transparent clear liquids, without tasting, how would you determine which is distilled water and which is a solution of salt water?

In sharbat, what should be mixed first, ice cubes or sugar?

How will you separate iodine from washing soda?

Does water dissolve equal amounts of different soluble substances?

Sheela, Saima and Ravi have to dissolve maximum amount of sugar in the same amount of milk, so as to win in a game. Ravi took hot boiling milk, while Saima took ice cold milk. Sheela managed to get milk at room temperature. Whom do you think would win the game and why?

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

Define the term condensation.

Winnowing is based on which property?

When the process of handpicking is used?

A mixture of iron nails, salt, oil and water is provided to you. Give step wise method to separate each component from this mixture?

You are provided with a mixture of salt, sand, oil and water. Write the steps involved for the separation of salt, sand and oil from the mixture by giving an activity along with the diagram

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?

Paheli was feeling thirsty but there was only a pot of water at home which was muddy and unfit for drinking. How do you think Paheli would have made this water fit for drinking if the following materials were available to her?
Alum, tub, muslin cloth, gas stove, thread, pan and lid.

Both Sarika and Mohan were asked to make salt solution. Sarika was given a teaspoonful of salt and half a glass of water whereas, Mohan was given twenty teaspoonful of salt and half a glass of water.
(a) How would they make salt solutions?
(b) Who would be able to prepare saturated solution?

In a solution of salt and water, no more salt can be dissolved. If we want to add more salt, it needs to be

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?

Sedimentation is followed by which process?

Which of the following is a heterogeneous solution?

Most of the substances present around us are:

Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho, how these droplets of water were formed? Which of the following should be Boojho's answer?

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?

You might have observed the preparation of ghee from butter and cream at home. Which method(s) can be used to separate ghee from the residue?
(i) Evaporation
(ii) Decantation
(iii) Filtration
(iv) Churning
Which of the following combinations is the correct answer?

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?

Four mixtures are given below:
(i) Kidney beans and chickpeas
(ii) Pulses and rice
(iii) Rice flakes and corn
(iv) Potato wafers and biscuits
Which of these can be separated by the method of winnowing?

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

Which of the following mixtures would you be able to separate using the method of filtration?

Boojho's grandmother is suffering from diabetes. Her doctor advised her to take 'Iassi' with less fat content. Which of the following methods would be most appropriate for Boojho to prepare it?

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?

Components of a ____ retain their properties.

A mixture of chalk powder from water can be separated by _____

Shallow salt water lakes are called ________

For separation of two miscible liquids we use ______

Centrifugation is used to separate ________ milk.

What is evaporation?

Can mixture of salt and sugar be separated by filtration?

What is meant by centrifugation?

Define loading.

Name two materials that are used as filters