Question

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Answer 1

1) pure subsatance is not a mixture of any thing.

• A pure element or compound contains only one substance, with no other substances mixed in.

Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.

2) The concentration of a substance is the quantity of solute present in a given quantity of solution.

Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

3) Two conditions essential for using distillation method are as follows.

• The two liquids should be miscible with each other.

This means that the two liquids should properly mix with each other.

The difference in boiling point of the two liquids should be less than 25 degree celsius.

4) Fog is water vapor in atmosphere which condenses due to low temperature and forms dense white thing in atmosphere,it is not a pollutant but it reduces visibility.

Smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion.

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Answer 2

Answer:

1. A pure element or compound contains only one substance, with no other substances mixed in. Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.

2. In chemistry, the concentration of a solution is the quantity of a solute that is contained in a particular quantity of solvent or solution.

3. Solution : (i) The components of the mixture must be miscible with each other. (ii) In case, both the miscible components are liquids, they must differ in their boiling point by more than 25∘C.

4.Smoke and fog both are aerosols but their dispersed phase is different.

The dispersed phase in fog is liquid (water droplets) whereas the   dispersed phase in smoke is solid (particulate matter). Both fog and smoke  have gas at the dispersion medium .

5. It means that, at room temperature 36.5 g of Nacl can be dissolved in 100 g (or 100 ml) of water. Question 6. Salt can be recovered from its solution by evaporation.

Explanation:

Hope this helps you.