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Chapter 3

Changes in Matter

TermDefinition
Atom The smallest unit of an element that has the properties of that element.
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.
Chemical Change A change in which a substance or two becomes a new substance or two.
Chemical Property A property that involves the ability of a substance to react with other materials to form new substances.
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 total mass of the products that form in a chemical reaction is equal to the total mass of the substances that react.
Mixture A combination of two or more different substances.
Molecule A group of two or more atoms that are joined chemically.
Physical Change A change in which a substance remains the same substance.
Physical Property A trait - such as color, shape, or hardness - that describes a substance by itself.
Created by: Dr. Austin