Anything that takes up space and has mass (all matter is made up of atoms.)

The smallest unit of a chemical element.

Each element is made up of only one kind of atom (there are about 120 elements.)

A list of all the chemical elements that exist in the universe that have been discovered.

Formed when 2 or more atoms join together (these may be the same or different)

Formed when 2 or more DIFFERENT atoms are joined together (all compounds are also molecules, but not all molecules are compounds)

Tell you how many “atoms” of each element for that molecule. Ex h2o2=2 atoms of hydrogen 2 atoms of oxygen

Multiply the number of molecules you are making. Ex. 2h2o= 4 atoms hydrogen 2 atoms oxygen.

The process by which plants make their own food (to make food plants need carbon dioxide, water and sunlight.)

All living things gain and lose energy using this process. Doesn’t mean breathing the food you eat breaks down into glucose than can be broken down to release energy.

The major source of energy in a body’s cells

A naturally present gas powered by burning carbon, and organic compounds and by respiration l

Colorless, Odorless reactive gas, life supporting component of the air.