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the scientific study of the composition, structure, and properties of matter and the changes that matter undergoes


anything that has mass and takes up space


a substance that cannot be seperated or broken down into simpler substances by chemical means


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


a substance made of atoms of two or more different elements that are chemically combined


the smallest unit of a substance that keeps all of the physical and chemical properties of that substance

chemical formula

a combination of chemical symbols and numbers to represent a substance

pure substance

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


a combination of two or more substances not chemically combined

melting point

the temperature and pressure at which a solid becomes a liquid

boiling point

the temperature at which a liquid becomes a gas


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


the ability of a substance to combine chemically with another substance


the ability of a substance to react in the presence of oxygen and burn when exposed to a flame

physical change

a change of matter from one form to another without a change in chemical properties

chemical change

a change that occurs when a substance changes composition by forming one or more new substances

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