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8th Grade Science #1

Texas TAKS review for 8th Grade Science-Physical Property

QuestionAnswer
physical property characteristic of matter that can be observed and measured without changing the composition of the matter
physical property examples mass, density, ductility, malleability, hardness, conductivity, luster, and solubility
chemical property the characteristics of a substance as it react with others to form new substances with different properties
chemical reaction a process in which one or more substances interact to produce one or more NEW substances
compound a pure substance made of two or more different elements chemically combined
Na + Cl combine to form NaCl Example of a compound (sodium and chlorine combine to make the compound sodium chloride which is table salt)
molecule formed when two or more atoms join together chemically
proton a particle in the nucleus of an atom that has a POSITIVE charge; its mass is 1 amu
neutron a particle in the nucleus of an atom that has NO electric charge; its mass is 1 amu
electron cloud an area surrounding the nucleus of an atom where electrons are found
electron a negatively charged subatomic particle that orbits around the nucleus of an atom; its mas is 0 amu
atom the smallest particle of an element that has all the properties of that element
Created by: switt@ccisd.net
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