Have you ever talked with someone when it is cold outside and you can see your breath? Your ________ looks like a cloud.

On warm days, your breath is __________________.

The inside of your mouth is warm, so the air inside of it is

warm too. One of the things you ____________ out is water in the gaseous state.

The gaseous water you breathe out is warmer than the cool gases in the _____________.

The gaseous water you breathe out is warmer than the cool gases in the air. When your warm breath and the cold air

meet outside your mouth, some of the water from your breath cools _______________.

The water becomes cold enough that it ________________ into tiny drops of liquid water.

The water becomes cold enough that it ________________ into tiny drops of liquid water.

When any gas condenses, all the particles that were once spread out in the _____________ state get closer together.

In the example of your breath, the water molecules are first spread out as a gas. The water molecules you breathe out lose energy and move so much slower that they sort of clump together to become liquid _________________.

These clumps are made of so many molecules that you

can see them as tiny water drops. A lot of these tiny drops all together look like a small ________________.

When you see that little cloud, you might say that you can see your _______________.

You have probably seen another phenomenon that happens because of water condensing. Have you ever opened a ________________ when the room is warm?

If the room is warm, you see something that looks like a cloud of _______________ when you open a freezer door.

__________________ water molecules in the warm air become so cool that they condense into tiny water drops.

Sometimes, so many water molecules condense that you can see big water drops. If you leave a cold soda pop can on the table, small ____________ form on the outside of the can.

Water molecules in air touch the cold can. When this happens, gaseous water molecules lose their ______________ to the atoms at the surface of the can.

The gaseous water __________________ into droplets of liquid water on the can.

If you thought that the white lines you see in the sky behind a jet are a type of cloud, you were right. In fact, those white streaks are called contrails (short for ____________________ trails).

A contrail forms because one of the substances that jet engines make is water. The water is released into the air in the ______________ state.

Water in the ___________ state is called water vapor. You cannot see water vapor.

The air high up in the sky is very cold.

Seeing your breath, contrails, and water droplets on a cold beverage can are examples of water changing from the gaseous state to the liquid state.

Boiling point is not a property of a substance.

What do we know about temperature and how molecules move in a gas?

When do we know about the distance between molecules as we cool a substance in the gaseous state?

Evaporation occurs when molecules at the surface of a liquid gain enough energy to enter the gaseous state.

Boiling occurs at the temperature in which molecules throughout the liquid change to the gaseous state. The boiling point is the temperature at which the change of state from liquid to ____________ occurs.

Condensation occurs when water vapor in the air slows down sufficiently to become a __________.

How can you explain now that the odor reached

your nose?

How are gases and liquids of the same substance similar?

What is needed for a liquid to undergo a phase change to a gas?

What do we notice as we compare our models of matter for gases and liquids?

How could the ice in the cup cause water in air to form drops of water on the outside of the cup?

What makes up air?

Temperature is a measure of the average kinetic energy of particles of matter.

The amount of energy transfer needed to change the temperature of a matter sample by a given amount depends on the nature of the matter, the size of the sample, and the environment.

What is the definition of sublimation?

What is an example of sublimation?