Cup a and cup b are identical. they contain equal volumes of soup at equal temperatures. both cups are put in a refrigerator. cup a has a lid, but cup b does not. which statement best explains why cup a will cool more slowly than cup b?

a.
water vapor won’t be able to escape from cup a.
b.
the most energetic water molecules from cup a will escape more rapidly.
c.
no molecules will be able to evaporate at the surface of cup b.
d.
no molecules will be able to evaporate at the surface of cup a.

Option (D) is the correct answer.

Explanation:

It is known that in a closed system there will no exchange of heat or matter from the system to the surrounding. Whereas in an open system there will be exchange of both heat and energy from the system to the surrounding and vice versa.

Therefore, in the given situation cup A is a closed system and cup B is an open system. Hence, there will be no exchange of heat or matter from cup A to system and surrounding. So, it will cool slowly that cup B.

Thus, we can conclude that the statement no molecules will be able to evaporate at the surface of cup A, best explains why cup A will cool more slowly than cup B.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.