Describing and Classifying Matter


Anything that has mass and takes up space

States of matter

Solid, liquid, gas


A single kind of matter that is pure, meaning it always has a specific makeup, or composition

Physical Properties of Matter

Characteristics that can be observed using the senses without changing it into another substance.

Chemical Properties of Matter

Characteristics of a substance that determine how it will react with other substances and describes its ability to change into different substances.

Examples of physical properties

Melting point or boiling point of a substance, density, mass

Examples of chemical properties

Rusting, flammability, reaction with a substance, neutralize


Basic unit of matter from which all matter is made


Matter made up of only one type of atom


A group of two or more atoms held together by chemical bonds


A substance made of two or more elements chemically combined in a specific ratio, or proportion.


Two or more substances that are together in the same place but their atoms are not chemically bonded

Chemical bond

the force that holds two atoms together

Heterogeneous mixture

A mixture you can easily separate because the matter is distinct from each other

Homogeneous mixture

A mixture that is difficult or impossible to separate because the matter is blended or dissolved.


separation of a liquid by boiling