HT.2.b Particle theory of matter

As particles are exposed to heat energy they __________

• have more kinetic energy

• have less kinetic energy

• stay the same

• don't move

As particles have heat removed from them they _____

• have more kinetic energy

• have less kinetic energy

• stay the same

• don't move

Particles in which state have more kinetic energy?

• liquid

• solid

• gas

As particles are exposed to less heat they _____

• increase in kinetic energy

• decrease in kinetic energy

• stay the same

• disappear

Which characteristic is included in the particle theory of matter? (Select all that apply)

• All matter is made up of tiny particles

• All particles in a pure substance are the same

• Particles are always moving randomly

• Adding heat increases the kinetic energy of the particles

True or False: Matter cannot be created or destroyed.

• True

• False

Particles in which state have the weakest bonds between them?

• Solid

• Gas

• Liquid

If a container is fixed, and heat is added to a gas...

• the container will expand

• the pressure will increase

• the pressure will decrease

• the container will contract

Answer explanation

Pressure is the number of collisions with the side walls. With increased kinetic energy due to added heat, and volume remaining constant, collisions with the walls will increase, and thus the pressure, too!

Sweating cools your body because...

• Water releases energy to change from gas to liquid, giving thermal energy to your body

• Water releases energy to change from gas to liquid, taking thermal energy away from your body

• Water requires energy to change from liquid to gas, taking thermal energy away from your body

• Water requires energy to change from gas to liquid, taking thermal energy from your body

Touching steam causes skin burns because...

• Water requires energy to change from gas to liquid, taking lots of thermal energy away from your skin

• Water releases energy to change from gas to liquid, taking lots of thermal energy away from your skin

• Water requires energy to change from liquid to gas, taking lots of thermal energy away from your skin

• Water releases energy to change from gas to liquid, giving lots of thermal energy to your skin