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MGH 2 (6)
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 |