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  • Name the process associated with the following: (a) Dry ice is kept at room temperature and at one atmospheric pressure. (b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water.

Name the process associated with the following:
(a) Dry ice is kept at room temperature and at one atmospheric pressure.
(b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
(c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.
(d) An acetone bottle is left open and the bottle becomes empty.
(e) Milk is churned to separate cream from it.
(f) Settling of sand when a mixture of sand and water is left undisturbed for some time.
(g) Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths.

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Solution:

(a) Sublimation of dry ice (solid) to CO2 (gas): Dry Ice will convert in gas without going through intermediate liquid state.
(b) Diffusion of ink into water: The ink flow from higher concentration to lower concentration.
(c) Dissolution of solid into liquid: Slowly potassium permanganate crystal will dissolve in water to make a solution.
(d) Evaporation of acetone in air : As the boiling point of acetone is very small , it get evaporated and diffused in the atmosphere.
(e) Centrifugation of cream: In the process of churning, a centrifugal force acts away from the central line. Thus, cream get collected on the walls of vessel.
(f) Sedimentation
(g) Tyndall effect – Heterogeneity of air causes bending and scattering of light.

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