Matter and Its Changes

Term Definition
matter everything that has mass and takes up space.
atom small particle that is the building block of all matter
substance matter with a composition that is always the same
element a pure substance made up of only one kind of atom
molecule two or more atoms that are held together by chemical bonds and act as a unit
compound substance made of two or more elements that are specifically joined in a specific combination
mixture matter that can vary in composition
heterogenous mixture mixture in which the substances are not evenly mixed
homogenous mixture a mixture in which two or more substance are evenly mixed but not bonded together
physical change a change in size, shape, form or state of matter that does not change the matter’s identity
chemical change a change in matter in which the substances that make up the matter change into other substances with different physical and chemical properties
law of conservation of mass states that the total mass of a chemical reaction is the same as the total mass after the chemical reaction

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