4. (a) Explain in terms of molecules,why is it possible to compress a gas but not liquids?
Ans:Gas molecules are further apart while liquid molecules are close together which makes it easy for gases to be compressed than liquids.
(b) Two containers made of insulating material contain the same volume of water at room temperature. The containers do not have lids . The volume of liquid in each container gradually decreases.
(i) After a certain time the temperature of the water has decreased to below room temperature.
Explain in terms of molecules why the temperature has decreased ?
Ans: There was more kinetic energy in the water molecules so they can evaporate much more easily. The molecules that have no kinetic energy remains. So the temperature is lower.
(ii) One of the containers is wide and shallow. The other container is narrow and deep .
Predict which container has the greater rate of cooling. Explain your answer.
Ans: The wide and shallow container has the greater rate of cooling. It has the higher chance of evaporation as the surface are of the water is larger.
Thank You
Hope it helps
~Feriette Drairy
