Changes in Energy at the Molecular Level Review

How would you describe this state of matter?

• solid state and particles move slow

• liquid state and particles move a little faster

• gaseous state and particles move VERY fast

If the particles in a substance are moving VERY quickly, the temperature of the substance is probably...

• cold

• hot

• lukewarm

Which is NOT one of the three states of matter?

• water

• liquid

• gas

• solid

In this state of matter, there is a strong attraction between the molecules and they cannot break away from each other.

• liquid

• gas

• solid

Change of state when a gas turns back into a liquid. Like water drops on a mirror in your bathroom after you take a shower.

• melting

• freezing

• condensation

• evaporation

Change of state when a liquid turns into a solid. Like when you make homemade popsicles.

• melting

• freezing

• condensation

• evaporation

When thermal energy (heat) is added to a substance the particles will...

• move faster

• move slower

• NOT change speed at all

If an object has particles that are moving VERY slowly, the temperature of the object will probably be...

• hot

• cold

• lukewarm

If you ADD thermal energy to a substance which statement describes what will happen to the kinetic energy & temperature?

• Kinetic energy will decrease and temperature will decrease.

• Kinetic energy will increase and temperature will decrease.

• Kinetic energy will increase and temperature will increase.

When you are heating or ADDING thermal energy to a pot of water on the stove what statement BEST describes scientifically what is happening?

• The molecules are losing kinetic energy and the attraction is becoming stronger.

• The molecules are gaining kinetic energy, the attraction between particles is decreasing greatly.

• There is NO change in kinetic energy or attraction between molecules.