4. Lin cooked a pot of soup, then put half the soup in the freezer for a while. Now the soup in the pot is hot, and the soup in the freezer is cold. What is the difference between the molecules of the soup in the pot and the molecules of the soup in the freezer?

Question

Responses

a
The molecules of the soup in the pot are moving and the molecules of the soup in the freezer are not moving.
The molecules of the soup in the pot are moving and the molecules of the soup in the freezer are not moving.

b
The molecules of the soup in the pot are moving faster than the molecules of the soup in the freezer.
The molecules of the soup in the pot are moving faster than the molecules of the soup in the freezer.

c
There is no difference because all of the soup is made of the same type of molecules.
There is no difference because all of the soup is made of the same type of molecules.

d
The molecules of the soup in the freezer are smaller than the molecules of the soup in the pot.

Answer 1

The best response to describe the difference between the molecules of the soup in the pot and the molecules of the soup in the freezer is:

b The molecules of the soup in the pot are moving faster than the molecules of the soup in the freezer.

This is because temperature is a measure of the average kinetic energy of the molecules. The hot soup has molecules that are moving more rapidly, while the cold soup in the freezer has molecules that are moving more slowly.