1. (i) What temperature in Kelvin scale is equal to 50? C? (ii) Describe an activity to show that rate of evaporation increases with surface area. (iii) Sate two differences between evaporation and boiling.
Answers
Answer:
(i) 323.15 K
(ii) Evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while putting clothes for drying up we spread them out.
(iii) [see explanation.]
Explanation:
(i) 50° C + 273. 15 K = 323.15 K
(ii) Activity:-
> Take 5 ml of water in a test tube and keep it near a window or under a fan.
> Take 5 ml of water in an open China dish and keep it near a window or under a fan.
> Take 5 ml of water in an open China dish and keep it inside a cupboard.
> Record the room temperature.
> Record the time or days taken for the evaporation process in the above cases.
> You can repeat the above three steps of activity on a rainy day and record your observations.
(iii) Evaporation - is the process where liquid starts changing into vapours at any temperature below its boiling point. Evaporation occurs only on the surface of the liquid.
Boiling - Boiling is an unnatural process where the liquid gets heated up and vaporized due to continuous heating of the liquid. Boiling usually occurs on the entire mass of the liquid that gets heated up.
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Answer:
(i) 323.15 K
(ii) Evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while putting clothes for drying up we spread them out.
(iii) [see explanation.]
Explanation:
(i) 50° C + 273. 15 K = 323.15 K
(ii) Activity:-
> Take 5 ml of water in a test tube and keep it near a window or under a fan.
> Take 5 ml of water in an open China dish and keep it near a window or under a fan.
> Take 5 ml of water in an open China dish and keep it inside a cupboard.
> Record the room temperature.
> Record the time or days taken for the evaporation process in the above cases.
> You can repeat the above three steps of activity on a rainy day and record your observations.
(iii) Evaporation - is the process where liquid starts changing into vapours at any temperature below its boiling point. Evaporation occurs only on the surface of the liquid.
Boiling - Boiling is an unnatural process where the liquid gets heated up and vaporized due to continuous heating of the liquid. Boiling usually occurs on the entire mass of the liquid that gets heated up.