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pure substance matter that always has the same, exact composition element substance that cannot be broken down into simpler substances atom smallest particle of an element compound a substance that is made from two of more simpler substances and can be broken down into simpler substances heterogeneous the parts of the mixture are noticeably different from one another homogeneous difficult to distinguish one substance from another because they are so evenly distributed solution dissolved homogeneous mixture e.g. salt water suspension heterogeneous mixture that separates into layers over time e.g. make up remover colloid intermediate sized particles that scatter light. homogeneous mixture. e.g. milk physical property any characteristic of a material that can be observed or measured without changing the composition of the substance in the material viscosity the resistance to flow conductivity material's ability to allow heat to flow malleability the ability of a solid to be hammered without shattering melting point temperature at which a substance changes from solid to liquid boiling point temperature at which a substance boils physical change occurs when some of the properties of a material change, but the substances in the material stay the same sublimation physical change of a solid to a gas deposition physical change of a gas to a solid freezing point temperature at which a substance changes from liquid to solid condensation point temperature at which a substance changes from gas to liquid density ration of mass to volume. m/v. <|3 flammability ability to burn in the presence of oxygen reactivity how readily a substance combines chemically with other substances chemical change occurs when a substance reacts and forms one or more substances evidence for chemical change change in color, production of gas, formation of precipitate, temperature precipitate any solid that forms and separates from a liquid mixture mixture not set proportions. molecule a neutral group of atoms that are joined together by one or more covalent bonds chemical property any property that produces a change in the in the composition of matter