Question

question 9
select the two options that best complete the following sentence.
according to the particle model, as heat is added to a substance the particles:

□ increase in speed
□ decrease in speed
□ increase in energy
□ decrease in energy
□ im not sure

Explanation:

When heat is added to a substance, according to the particle model, the particles gain energy. As the energy of the particles increases, their kinetic energy (related to motion) also increases. Kinetic energy is related to the speed of the particles ($KE=\frac{1}{2}mv^{2}$, where $KE$ is kinetic energy, $m$ is mass and $v$ is speed). Since the mass of the particles remains constant (assuming no chemical change), an increase in kinetic energy means an increase in speed.

Answer:

A. increase in speed, C. increase in energy