Question

what happens when the temperature of an object increases?
the objects particles move faster.
the objects particles move closer together.
the number of the objects particles increases.
the objects particles stop moving.

Explanation:

To solve this, we analyze each option based on the kinetic theory of matter:

• Option 1: When temperature increases, the kinetic energy of particles increases, so they move faster. This is consistent with the theory.
• Option 2: Increasing temperature usually causes particles to move apart (expansion), not closer. So this is incorrect.
• Option 3: Temperature change doesn't change the number of particles (mass is conserved in a closed system). So this is incorrect.
• Option 4: Particles are always in motion (even at absolute zero, quantum effects mean they aren't completely still). So this is incorrect.

Answer:

A. The object's particles move faster.