Question

what type of energy is released by the chemicals in a hand-warmer?

a kinetic energy

b chemical energy

c mechanical energy

d thermal energy

Explanation:

• Option a: Kinetic energy is the energy of motion, and hand - warmers don't release energy related to motion from their chemicals, so a is incorrect.
• Option b: Chemical energy is stored in the chemicals, but the question is about the energy released by the chemicals in a hand - warmer. Hand - warmers release energy in the form of heat (thermal energy) by using the stored chemical energy, so b is incorrect.
• Option c: Mechanical energy is related to the position and motion of an object (like potential and kinetic energy of a mechanical system). Hand - warmers don't release mechanical energy from their chemicals, so c is incorrect.
• Option d: Hand - warmers work by a chemical reaction that releases heat. Thermal energy is the energy related to heat. So the chemicals in a hand - warmer release thermal energy.

Answer:

d. thermal energy