Which term describes the energy of particle motion in matter felt as heat?

• A. The energy of motion
• B. The energy of light traveling in waves
• C. Thermal Energy
• D. The energy stored in chemical bonds

Answer: (C)

Heat comes from the random motion of particles inside matter, and the energy associated with that motion is called thermal energy. Temperature reflects the average kinetic energy of those particles, so when a substance is hotter, its particles are moving more vigorously and its thermal energy is higher, which we perceive as heat. This makes thermal energy the best term for describing the energy you feel as heat in matter.

The other ideas don’t fit as neatly: the energy of motion in general is kinetic energy, but it doesn’t specify heat in matter. Radiant energy is energy carried by light waves, not the motion of particles inside a substance. The energy stored in chemical bonds is chemical energy, which can be released or transformed but isn’t defined as the heat you feel from particle motion unless it’s converted into thermal energy.