Science vocab

Matter

A physical substance that takes up space and has mass.

Particle

A small unit of a physical substance.

Atom

The smallest piece of an element, where it is still an element.

Homogenous (solution)

A combination of two or more substances that is uniform throughout, so the different substances cannot be easily distinguished.

Heterogenous (mechanical mixture)

A combination of two or more substances, where the substances can be visibly distinguished from one another.

Mixture

A combination of two or more different substances.

Element

A substance that is made up of only one type of atom.

Chemical bond

A force that holds atoms together in a molecule or compound.

Compound

A group of two or more atoms from different elements that are chemically bonded together in a fixed ratio.

Molecule

A group of two or more atoms that are chemically bonded together.

Pure substance

A physical substance made of only one type of particle.