e. Describe briefly how you can separate sand from water using sedimentation and
decantation.
Answers
Answer:
Sand and water can be separated by any of the following two methods: (a) Sedimentation and decantation
Explanation:
: Mixture is kept undisturbed for some time. After some time, sand being heavier and insoluble in water, settles down at the bottom of container. Now, water is poured into another container to separate it from sand.
Answer:
Take a mixture of sand and salt. How will we separate these? We already saw that handpicking would not be a practical method for separating these.Keep this mixture in a beaker and add some water to this. Leave the beaker aside for some time. Do you see the sand settling down at the bottom? The sand can be separated by decantation or filtration. What does the decanted liquid contain? Do you think this water contains the salt which was there in the mixture at the beginning?
Now, we need to separate salt and water from the decanted liquid. Transfer this liquid to a kettle and close its lid. Heat the kettle for some time. Do you notice steam coming out from the spout of the kettle?
Take a metal plate with some ice on it. Hold the plate just above the spout of the kettle as shown in Fig. 6. What do you observe?
Let all the water in the kettle boil off.
When the steam comes in contact with the metal plate cooled with ice, it condenses and forms liquid water. The water drops that you observed falling from the plate, were due to condensation of steam. The process of conversion of water vapour into its liquid form is called condensation.
Did you ever see water drops condensed under a plate that has been used to cover a vessel containing milk that has just been boiled?
After all the water has evaporated, what is left behind in the kettle?
We have thus, separated salt, sand and water using processes of decantation, filtration, evaporation and condensation.
Explanation:
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