Question

07 multiple choice
which is true of the particle theory of matter? (select all that apply)
all matter is made of particles
all atoms of the same element are identical
the speed of the particles determine the temperature of an object
particles are in constant motion

Explanation:

1. The core tenet of the Particle Theory of Matter is that all matter is composed of tiny particles.
2. Isotopes are atoms of the same element with different masses (due to different neutron counts), so not all atoms of the same element are identical.
3. Temperature is a measure of the average kinetic energy of particles, which is directly related to their speed.
4. A key principle of the theory is that all particles are in continuous, constant motion.

Answer:

• All matter is made of particles
• The speed of the particles determine the temperature of an object
• Particles are in constant motion