Question

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Answer 1

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Answer 2

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Question 1. State any one difference between pure and impure substances.

Solution: The constituents, which make up a pure substance cannot be separated by physical means

The constituents of an impure substance can be separated by physical means.

Question 2. What is meant by concentration of a solution?

Solution: The concentration of a solution is the amount of solute present per unit volume or per unit massof the solution or solvent.

Question 3. List the two conditions essential for using distillation as a method for separation of the components from a mixture.

Solution: 1. two liquids must be miscible that is they totally mix with each other.

2. the difference between the boiling points of the liquids should be less than 25k.

Question 4. Smoke and fog both are aerosols. In what way are they different?

Solution: They differ by their composition. They both are colloidal mixtures but smoke is consists of air mixed with carbon particles but fog consists of air mixed with water vapour ( mostly).

Question 5. What do you understand by the statement 'the solubility of NaCl is 36.5 g at room temperature'?

Solution: It means that, at room temperature 36.5 g of Nacl can be dissolved in 100 g (or 100 ml) of water.

Question6. Salt can be recovered from its solution by evaporation. Can you suggest any other technique also?

Solution: Crystallisation method.

Question 7. Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. Of not, explain.

Solution: No, being miscible they cannot be separated by using a separating funnel.

Question 8. Crystallization is a better technique than sample evaporation. Give one reason to justify the statement.

Solution: Crystallization is better than evaporation in mainly two ways :

1. In evaporation, the solution needs to be at the boiling point of the solvent, the whole time. This may degrade the solute.

2. In crystallization, the crystals automatically throw away impurities to arrange themselves in a regular manner. Therefore, the degree of purity is higher than the solute left after evaporation.

Question 9. Define an element.

Solution: Element as a basic form of matter that cannot be broken down into simpler substances by chemical reactions.

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