Question

part a
which of the following correctly defines the principles of kinetic molecular theory?

• particles move slower when temperature increases.
• there are no attractions between particles.
• the space between the particles is the same as the size of the particles.
• when particles collide, they become motionless.

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Explanation:

To determine the correct principle of kinetic molecular theory:

• Analyze "Particles move slower when temperature increases": Incorrect. Kinetic energy (and thus particle speed) increases with temperature.
• Analyze "There are no attractions between particles": Correct. A key principle of kinetic molecular theory (for ideal gases) is that intermolecular forces are negligible.
• Analyze "The space between the particles is the same as the size of the particles": Incorrect. The space between particles is much larger than the particles themselves (especially in gases).
• Analyze "When particles collide, they become motionless": Incorrect. Collisions are elastic, and particles continue moving (with possible direction/speed changes).

Answer:

The option "There are no attractions between particles."