Particles in Motion - Lesson 1

What happens to particles as they heat up?

• They slow down
• Nothing
• They don't move
• They speed up

What happens to particles as they cool down?

• They slow down
• Nothing
• They don't move
• They speed up

Which direction will the heat flow while this ice cap melts?

• there is no heat transfer
• from the icecap to the water
• from the water to the icecap

Heat transfers from an area of ____temperature to an area of ___ temperature.

• high to low
• low to high
• high to high

Compared to cold water, hot water molecules are _________.

• closer together

• farther apart

• moving slower

• smaller

The greater the temperature difference between two substances is, the _____________ the heating rate will be.

• slower

• faster

An increase in the volume of a substance when the temperature increases is called ___________________________________.

• thermal contraction

• thermal expansion
• temperature
• heat

The liquid in a thermometer ______________ as the temperature decreases.

• expands
• contracts

• freezes
• explodes

Thermal Expansion & contraction are most noticeable in which state of matter?

• Solids

• Liquid

• Gas

A measure of the average kinetic energy of the individual particles in an object is called:

• thermal energy
• conduction
• convection
• temperature