When a cup of hot chocolate is heated from 80 C to 90 C, which of the following is happening to the molecules of the liquid?

Question

When a cup of hot chocolate is heated from 80 C to 90 C, which of the following is happening to the molecules of the liquid?

a
The motion of the molecules will stay the same.
b
The motion of the molecules will speed up.
c
The motion of the molecules will slow down.
d
The motion of the molecules will stop.

Answer 1

The correct answer is B. The motion of the molecules will speed up. As the temperature of the hot chocolate increases, the kinetic energy of the molecules also increases, causing them to move faster and with greater force.