Question

Sue has a cup of hot chocolate and a cup of cold chocolate milk. Select the statement that describes which drink has more kinetic energy.
A.
the cup of hot chocolate because its molecules are moving slowly

B.
the cup of cold chocolate milk because its molecules are moving quickly

C.
the cup of hot chocolate because its molecules are moving quickly

D.
the cup of cold chocolate milk because its molecules are moving slowly

Answer 1

Answer:

The correct answer is (C)

Explanation:

In general, we can always say that kinetic energy of molecules of matter is directly proportional to their temperature (on Kelvin Scale). So, more is the temperature, more is the K.E. Hope, this helps.

Answer 2

The statement that describes which drink has more kinetic energy is C. the cup of hot chocolate because its molecules are moving quickly.

• Kinetic energy arises as a result of motion.
• When heat is applied to the molecules, more energy is supplied to the molecules and hence they vibrate faster.
• As the motion of the molecules increases, the kinetic energy of the substance will also increase.
• Hence, hot chocolate has more kinetic energy due to the quick motion of molecules rather than that in cold coffee in which molecules move slowly.