a) What temperature in kelvin scale is equal to 50
Oc?
b) Describe an activity to show that the rate of evaporation increases with
surface area.
c) State two differences between evaporation and boiling.
Answers
(a) 323.15K
(b) 1. Take 5ml of water in a test tube and keep it near a window or under a fan.
2. Take 5ml of water in a open China dish and keep it near a window or under a fan.
3. Take 5ml of water in a open China dish and keep inside a cupboard or a shelf in your class.
4. record the room temperature.
5. record the temperature or days for the evaporation process for above each cases.
6. repeat the above three steps of activities in rainy days and record your observation.
(c) Evaporation:- 1.evaporation occurs it's own at all temperature.
2. it is a surface phenomena and processes is slow.
Boiling:- 1. boiling occurs when the vapour pressure of liquid becomes equal to atmospheric pressure.
2. it is a bulk phenomenon and processes is fast.
Hope this helps...