6.4 Pure Substances and Mixtures - Vocabulary

Vocabulary flashcards covering key terms related to pure substances and mixtures.

atom

The smallest unit of an element that maintains the properties of that element.

element

A substance that cannot be separated or broken down into simpler substances by chemical means.

molecule

A group of atoms held together by chemical forces; the smallest unit of a compound that retains all the properties of that compound.

compound

A substance made up of atoms of two or more different elements joined by chemical bonds.

mixture

A combination of two or more substances that are not chemically combined.

pure substance

A sample of matter, either a single element or a single compound, with definite chemical and physical properties.

heterogeneous

Describes something that does not have a uniform structure or composition throughout.

homogeneous

Describes something that has a uniform structure or composition throughout.