Question

Q•1 Salt and chalk are mixed together in water. How would you separate them into dry salt and dry chalk dust?
Q•2Solubility of substances helps aquatic animals. How? ​

Answer 1

Explanation:

In the given question we have three compounds such as common salt, chalk powder and powdered camphor. Let discuss them one by one how they can be separated,

We know when we heat powdered camphor it sublime so this mixture can be separated by sublimation. We can separate the mixture of common salt and chalk powder by putting the mixture in water. As we know that common salt is a homogeneous mixture, so it will dissolve with water uniformly and chalk powder is heterogeneous so it could be separated by the filtration method by using filter paper.

Answer 2

Answer:

1)Some water is added to mixture of common salt and chalk powder. Chalk powder being insoluble in water is separated using filtration method and salt is obtained by evaporation.

2)The solubility of water, helps aquatic organisms in that, the water is able to dissolve gases like oxygen and carbon dioxide. This is important because, gaseous exchange in these organisms takes place in and and out of them from the water and back to the water.

Hope it helps you!!

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