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Physical Science CH2
Term | Definition |
---|---|
matter | anything that has mass and takes up space |
element | substance that cannot be broken down or separated into simpler substances by chemical means |
atom | smallest unit of an element that maintains the chemical properties of that element |
molecule | group of atoms held together by chemical forces |
compound | substance made up of atoms of 2 or more different elements joined by chemical bonds |
pure substance | matter sample that is either a single element or single compound has definite chemical and physical properties |
mixture | combination of 2 or more substances that are not chemically combined |
melting point | temperature and pressure at which a solid becomes a liquid |
boiling point | temperature and pressure at which a liquid becomes a gas |
density | ratio of the mass of a substance to the volume of the substance |
reactivity | the capacity of a substance to combine chemically with another substance |
physical change | change of matter from one form to another without a change in chemical property |
chemical change | change that occurs when 1 or more substances change into entirely new substances with different properties |