8th grade: Matter, Elements, Molecules, and Chemical Bonds

Vocabulary flashcards covering the definitions of matter, elements, atoms, molecules, compounds, chemical bonds, and the law of conservation of matter.

Matter

Any substance that has mass and takes up space.

Non-matter

Anything that does not have mass and does not take up space: light, heat, and sound.

Atom

The smallest unit of matter - what everything is made of!

Element

A basic substance made of atoms, where each type has special parts that make it unique.

Molecule

A particle made by two or more of the same atoms held together by a chemical bond, such as $H_2$ or $O_3$.

Compound

A substance formed by two or more different atoms held together by a chemical bond, such as water ($H_2O$) or sodium chloride ($NaCl$).

Chemical Bond

The force between two or more atoms that holds them together.

Covalent Bond

A type of chemical bond where atoms share electrons.

Double Bond

A bond formed when an oxygen atom shares two electrons with another oxygen atom.

Law of Conservation of Matter

the rule that says matter can neither be created nor destroyed, the amount of matter before and after a chemical reaction must be equal

How many parts do atoms have?

three!