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12 Cards in this Set

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atom
The smallest unit of an element that has the properties of that element.
molecule
A group of two or more atoms that are joined chemically.
element
A substance made of only one kind of atom.
change of state
A physical change that occurs when matter changes from one state to another, such as from a liquid to a gas.
physical change
A change in which a substance remains the same substance.
mixture
A combination of two or more different substances.
physical property
A trait - such as color, shape, or hardness - that describes a substance by itself.
chemical property
A property that involves the ability of a substance to react with other materials to form new substances.
chemical change
A change in which a substance or two becomes a new substance or two.
chemical reaction
A change in which one or more new substances are formed.
compound
A substance made of two or more different elements.
law of conservation of mass
The mass of the products of a chemical reaction equals the mass of the reactants.