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Chapter 3
Changes in Matter
Term | Definition |
---|---|
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. |