Topic 1, Lesson 1

When heat is added to a solid, how do the particles move?

• slower

• faster

• They don't move at all.

• They barely crawl.

Once a solid gains enough thermal energy, the solid can change to what state?

• mist

• gooey

• slushy

• liquid

What happens to the energy of the particles when water vapor begins to cool?

• The average potential increases.

• The particles freeze.

• The average kinetic energy decreases.

• The average kinetic energy increases.

The temperature at which a liquid freezes is called what?

• dew

• humidity

• freezing point

• boiling point

The temperature at which a liquid boils is called what?

• freezing point

• humidity

• boiling point

• dew

When water boiling in a pan begins to form bubbles on the bottom, what is happening?

• It is turning into a gas or changing state.

• The temperature has exceeded the boiling point.

• The particles are moving slower.

• The particles are moving faster.

Why would a big glass of ice melt slower than a small glass of ice?

• There are more in a big glass of ice than a small glass of ice so it is more difficult to move.

• It would not melt slower.

• Because the substance is cold, the particles are moving slower than the smaller cup of ice.

• Thermal energy is the total energy of all the particles in the object.