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4. Matter around us
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Q1 of 59 Page 101

Field Trip: Visit a milk dairy and note down the at least two separating techniques used there.

Two separating techniques used there are


a) Centrifugation : To obtain cream from raw milk. A rotating machine knowns as centrifuge is used.


b) Evaporation : After getting raw milk from farmers, it is evaporated so as to get its condensed form which is then mixed with small amount of sugar and packed in can.


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How is a mixture of common salt, oil and water separated? You can use a combination of different methods.

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Group activity (group of four): Use your research skills (including the Internet) to find out what is forensic science and obtain information about the use of chromatography in forensic science.

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Two immiscible liquids are taken in the above funnel for separation. Which is denser, X or Y? Suggest any one example for X and one for Y. A third liquid Z which is soluble only in Y is added to the mixture and contents in the funnel are shaken well. How many layers will you observe now? How will you separate the three liquids? Boiling point of X is 98° C, that of Y is 43° C and that of Z is 75° C.

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The most appropriate labelling of X and Y in a filtration set up are


Questions · 59
4. Matter around us
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