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Answer 1

Answer:

7)It is not possible to separate mixture of alcohol and water by using a separating funnel because these are not immiscible liquids. The mixture of alcohol and water can be separated by the process of distillation.

8)Crystallization is the better method of separating the mixture than evaporation. This is because, on evaporation, some of the solid particles in mixture get decomposed leaving behind impurities whereas, in crystallization, pure crystals of solids are obtained.

9)An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron.

10)Given,

Mass of sugar= 40g

Mass of water= 100g

To find :- concentration of sugar in water

Total mass of solution = mass of sugar + mass of water=100g +40g = 140g

percentage of concentration of sugar in solution=

40/140 ×100% =200/7%=28.57% approx

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Answer 2

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