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13 Cards in this Set

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Anything that has mass and takes up space

Matter

A substance that can not be seperated or broken down into simpler substances by chemical means

Element

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

Atom

A group of atoms that are held together by chemical forces; Smallest Unit of matter that can exist by itself and retain all of a substances chemical properties

Molecule

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

Compound

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

Pure substance

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

Mixture

The temperature and pressure @ which a solid becomes a liquid

Melting point

Temperature and pressure @ which a liquid becomes a gas

Boiling point

The ratio of the mass of a substance to the volume of the substance

Density

The capacity of a substance to combine chemically with another substance

Reactivity

A change of matter from one form to another with out change in chemical properties

Physical change

A change that occurs when one or more substances change into entirely NEW substances with different properties

Chemical Change