Question

dec. 2 thermal energy day 1 notes practice
if the atoms of a substance are moving faster, the thermal energy is ______.
a. changes of state in matter.
options: lower, the same, greater, unknown

Explanation:

Thermal energy is related to the kinetic energy of atoms/molecules. Faster - moving atoms mean higher kinetic energy, so thermal energy is greater. The diagram shows heating (melting, boiling) increasing particle motion, so as atoms move faster, thermal energy increases.

Answer:

C. Greater