Question

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Answer 1

Answer:

1. A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.
2. the mass of solute present in a given mass of solution.
3. A mixture of two miscible liquids can be separated by the process of fractional distillation.
4. True solution > Colloidal > Suspension.
5. SODA WATER -: Co2 is dissolved which is gas.
6. So the dispersed phase is yolk and dispersion medium is albumin.
7. When a hot saturated solution is cooled, then some of its dissolved solutes will separate out in the form of solid crystals. The solute will gradually form a precipitate.
8. The mixture of chalk and water can be separated by sedimentation, decantation, or filtration processes.
9. To make the salt solution of 15% with 15 gm as the mass of the solute, the mass of the solvent must be 85 gm. Therefore, 85 gm of water should be added.
10. What type of mixtures are separated by the technique of crystallization? Answer: Homogeneous mixtures such as common salt solution and copper sulphate solution separated by technique of crystallization.

2 Mark's

1. Ice, iron, hydrochloric acid, calcium oxide, mercury are pure substances as they have definite composition.
2. A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. ... An unsaturated solution is a solution that contains less than the maximum amount of solute that is capable of being dissolved.
3. Tyndall effect is observed when sunlight passes through canopy of a dense forest because: A) In the forest, mist contains tiny droplets of water which act as particles of colloid dispersed in air.
4. Homogeneous Mixture Heterogeneous mixture
5. They have no visible boundaries of separation between the constituents They have visible boundaries of separation between the constituents.
6. Aqueous solution Non- aqueous solution
7. The solution in which the solvent used is water The solvent used is not water
8. Water is a polar solvent. Solvent may be polar or non-polar.
9. Liquid solution May be solid,liquid or gaseous solution
10. Milk and starch solution are colloids, hence they show tyndall effect.because their particles are large enough to scatter the beam of light passing through them.