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Physical Science CH2

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
Created by: Rkaup99