As you breathe in through your ________, you force particles in the air to move through your nostrils.

In the nasal cavity, _________ particles match with receptors. Receptors are like the part of a lock into which a key fits.

Sometimes people forget to turn cars off in their garages, and the carbon __________ can build up in the air and move (like odors) into the house.

Some amount of carbon monoxide in the air is safe. The safe level is 39 parts per _______.

Many stores sell carbon monoxide detectors. They work like smoke_____________.

When a dangerous gas is odorless, then people cannot rely on their nose to warn them. People need other ways to detect ______________ gases.

When the canaries stopped chirping, the miners knew that there was too much carbon monoxide in the air. The miners then left the _________.

Which is this?

Which is this?

Which is this?

Which is this?

I am a state of matter: my molecules are very close together and hardly move. I am ____________.

I am a state of matter: my molecules are jumping all over the place. I must be a _________.

I am a state of matter: my molecules move past each other easily, but they are pretty close together.

Substances are made of particles.

Substances are made of particles. The particles are constantly moving.

In the gaseous state, there is empty ______________ between the particles.

Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to ______________ it.

Air has mass and volume. Matter is anything that has mass and __________________.

Matter can exist in three states (or phases): solid, liquid, and gas.

The state (or phase) of matter can be _________________ by temperature.

Gases have no definite shape or volume, and they can be added to or take out of a container.

Gases can expand and be compressed.

_______________ are made of particles with empty spaces in between them. All matter is made of particles.

Particles in a gaseous state can move.

Odors _____________ different because of the different materials of which the odors are made.

Humans smell about _____________ different odors.

Gases and liquids are made of molecules or inert atoms that are moving about relative to each other.

As the students pumped more air into the ball, the mass of the ball ______________.

What state of matter is salt at room temperature?

Tiny nerve cells in the nose carry messages to the ________.

You can _________ more things than you can taste.

What sense does smell intensify?

How can we smell different scents?

Matter in a ...... has a ...... volume and ...... shape