Odors could be on your “breathe in” list. You could also

put ___________ on your “breathe out” list.

Bad breath is what you ___________ when someone breathes out odor particles.

Water particles from lakes and puddles also go into the air. When you breathe in air, you must also breathe in water particles, but air is only made of a small amount of __________.

Most of the air is made up of nitrogen.

When you breathe out onto a cold window or on a mirror, you see the window fog up. It up because what you breathe out has water in it.

All animals breathe out carbon dioxide, so carbon dioxide is part of the air.

Atoms of __________ make up a small fraction of air.

Molecules are made of two (or more) ____________ joined together.

The atoms in a molecule stay together when the material changes states. __________________ do not come apart during phase changes.

All solids, liquids, and gases are made of particles.

• Some particles are single atoms.

• Molecules are groups of atoms.

Other particles are molecules.

Pure water is made of only water molecules. When

something is made of only one type of particle, it is

called a pure substance.

The water you drink from a faucet is a mixture. A _______________ is a material that has more than one type of particle in it.

If you could look at a tiny sample of carbon dioxide gas with a special microscope, you would see ______________

of carbon- oxygen molecules.

A _____________ is a way to represent something. For your gumdrop models, it did not matter what color gumdrops you used.

Atoms can be represented by different shapes and colors. Squares, dots, and gumdrop shapes are three ways to represent ___________.

You use materials to clean yourself, such as soap, shampoo, a towel, and a toothbrush. You use paper materials to blow your nose, to write on, and to ____________ from.

By knowing about atoms and molecules, scientists can ___________ new materials.

a gas in the atmosphere that plants use during the process of photosynthesis

What is the tiniest particle in the entire universe?

What is the name of a single type of atom?

What is the term for combining 2 or more atoms together?

General Answer: What is matter?

What are the three states of matter?

Something that takes up space and has mass.

What can causes ice to transform from a solid to a liquid?

Different models communicate different information, and thus are useful for different purposes.

A model is not a replica of the real phenomena. Atoms are not shaped like this; the colors are arbitrary and the size of all atoms is not really equal. A model is only a representation to help scientists (and students) explain and predict _________________________.

Some molecules are made of only one type of atom, but most are made of two or more ___________ that stick together.

Like atoms, molecules are so tiny that even the smallest amount of matter (such as one drop) is

made of millions and millions of molecules.

Something that takes up space and has mass.

Calcium (Ca) is an example of a(n):