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Can we reverse the following changes? If yes, suggest the name of the method.
(a) Water into water vapour
(b) Water vapour into water
(c) Ice into water
(d) Curd into milk
(a) Water into water vapour – Yes
By the method of condensation, water vapour can be converted to water.
(b) Water vapour into the water – Yes
On evaporating, water can be converted to water vapour.
(c) Ice into the water – Yes
On freezing, water can be converted to ice.
(d) Curd into milk – No
The conversion of curd to milk is an irreversible process.
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- Classify the following into solutions, suspensions and colloids :Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
- Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed. Which of the following should be Boojho’s answer?(a) Evaporation of water from the glass.(b) Water that seeped out from the glass.(c) Evaporation of atmospheric water vapour.(d) Condensation of atmospheric water vapour.
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