Phase Changes

The change of one state of matter to another is called

• Osmosis

• Phase Change

• Matter

• Energy

Transition from a liquid to a gas

• Condensation

• Freezing

• Evaporation

• Melting

Gas condenses to a liquid

• Evaporation

• Melting

• Freezing

• Condensation

What happens to molecules when their kinetic energy increases?

• The molecules move slower

• The molecules move faster

• The molecules get heavier

• It depends on the type of molecule

Three containers with the same amount of the same material are shown below. Which container has the substance with the highest amount of energy?

• The container on the left

• The middle container

• The container on the right

• All have an equal amount of energy

Three containers with the same amount of the same material are shown below. Which container has the substance with the lowest amount of energy?

• The container on the left

• The middle container

• The container on the right

• All have an equal amount of energy

Amy was sitting outside on a hot, summer day, enjoying a glass of sweet iced tea. She notices some water droplets on the outside of her glass.  What is causing those water droplets?

• The outside air is heating up the ice, causing it to melt into a liquid.

• The cold liquid in the glass is cooling the air around it, making it condense into a liquid.

• The outside air is heating up the liquid in the glass, causing it to evaporate.

• The liquid in the glass is cooling the air around it, causing it to evaporate.

When you boil water in a pot, some of the water escapes as steam. Which of the following choices explains what is happening with the water molecules in this scenario?

• The molecules slow down as the kinetic energy increases and move farther apart from one another.

• The molecules slow down as the kinetic energy decreases and move closer together.

• The molecules speed up as the kinetic energy increases and the molecules move farther apart from one another.

• The molecules speed up as the kinetic energy decreases and the molecules move closer together.

Which statement best describes what happens when heat is added to a substance?

• Energy moves out of the substance causing the molecules to slow down.

• Energy moves out of the substance causing the molecules to speed up.

• Energy moves into the substance causing the molecules to slow down.

• Energy moves into the substance causing the molecules to speed up.

The slower the particles in a substance move,

• the colder it is.

• the warmer it is.

• the more energy it has.