When the temperature of a substance increases, what happens to the particles within the substance?

• A. The particles become larger in size.
• B. The particles lose energy and stop moving.
• C. The particles move slower and have less kinetic energy.
• D. The particles move faster and have more kinetic energy.

Answer: (D)

Verified step by step guidance

1. Understand that temperature is a measure of the average kinetic energy of the particles in a substance.
2. Recall that when temperature increases, the particles gain energy, which affects their motion.
3. Recognize that particles do not change in size when temperature changes; their size remains constant.
4. Know that gaining energy causes particles to move faster, not slower, so their kinetic energy increases.
5. Conclude that an increase in temperature results in particles moving faster and having more kinetic energy.