Sunita dropped some ice cubes into a glass tumbler. After a while she saw two changes. Which of the following statements tell you what she might have observed?
A. The ice melted which is a physical change.
B. She saw droplets of water forming on the outside of the glass tumbler due to evaporation.
C. She saw droplets of water forming on the outside of the glass tumbler due to water vapour in the air condensing on it.
D. Condensation of water vapour is a physical change.
E. Formation of droplets is a chemical change as a new substance is formed.
F. The melting ice takes up heat from the surroundings.

(a) A, C, E, F are true.
(b) A, B, C, D are true.
(c) C, D, E, F are true.
(d) A, C, D, F are true.

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Solution

(d) A, C, D, F are true.
The melting ice takes up heat from the surroundings and it is a physical change. Formation of water droplets on the outside of the glass tumbler due to water vapour in the air condensing on it is a physical process.

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Question 10

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.

(d) Condensation of atmospheric water vapour.

Q. If you take ice cold water in a glass tumbler, you will observe some water droplets on its outer surface. What can we infer from this?

Due to which of the following phase change process water droplets are seen on the outer surface of a glass containing ice-cold water?

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(d) A, C, D, F are true. The melting ice takes up heat from the surroundings and it is a physical change. Formation of water droplets on the outside of the glass tumbler due to water vapour in the air condensing on it is a physical process.

(d) A, C, D, F are true.
The melting ice takes up heat from the surroundings and it is a physical change. Formation of water droplets on the outside of the glass tumbler due to water vapour in the air condensing on it is a physical process.