Question

please tell me the answer of these questions fast I will make you brain list

Answer 1

1.Names of fraction obtained from fractional distillation
*Petrol/gasoline- Fuel for petrol engines in cars
*Paraffin/kerosene - Aviation fuel, cooking and heating
*Diesel - Fuel for diesel engines (e.g. cars, trucks and ships)
*Lubricating Oil - Lubricant, polishes
*Bitumen - Road tar

2.i)Principle of Chromatography- It is a technique commonly used for separating a mixture of chemical substances into its individual components, so that the individual components can be thoroughly analyzed.

ii) Principle of Crystallization - The principle behind the crystallisation is that the amount of solute that can be dissolved by a solvent increases with temperature.

iii) Principal of Distillation - Distillation is a method of separating the constituents of mixture (either a liquid or q gaseous one).

iv) Principle of Centrifugation - The centrifuge works using the sedimentation principle, where the centripetal acceleration causes denser substances and particles to move outward in the radial direction.

3.Distillation is commonly used to separate ethanol - the alcohol in alcoholic drinks - from water. The mixture is heated in a flask. Ethanol has a lower boiling point than water so it evaporates first. The ethanol vapour is then cooled and condensed inside the condenser to form a pure liquid.

4. a) Winnowing
b) Chromatography
c) Separating funnel
d) Evaporation
e) Centrifugation
f) Crystallization
g) Sublimation
h) Distillation
i) Fractional Distillation
j) Filtration