Classifying Matter

Front

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Back

Atom

Front

A substance formed when two or more of the same atom chemically combine.

Back

Element

Front

A substance formed when two or more different chemical elements are chemically bonded together.

Back

Compound

Front

A number that is not infinite; it has a specific, countable value.

Back

Finite Number

Front

A well-substantiated explanation of some aspect of the natural world, based on a body of evidence.

Back

Scientific Theory

Front

A statement based on repeated experimental observations that describes some aspect of the world.

Back

Scientific Law

Front

A pH level of 7, indicating a balance between acidity and alkalinity.

Back

Neutral pH

Front

Having a pH less than 7; a substance that donates hydrogen ions.

Back

Acidic

Front

Having a pH greater than 7; a substance that accepts hydrogen ions.

Back

Basic

Front

A scale used to specify the acidity or basicity of an aqueous solution.

Back

pH Scale