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Chemistry study of matter and its reactions Matter anything that has mass and takes up space Properties characteristics used to describe a substance Gas phase of matter that has no definite shape or volume Liquid phase of matter with a definite volume, but no definite shape Phase form of matter Solid phase of matter with a definite shape and volume Condensation change from a gas to a liquid Evaporation change from a liqid to a gas at the surface of the liquid Freezing change from a liquid to a solid Melting change from a solid to a liquid Chemical change change that produces new substances Density mass per unit volume Physical change change that does not produce new substances Elements simple substances that can't be broken down into simpler substances Chemical symbols shorthand way of writing the names of the elements Group vertical column of elements in the periodic table Period horizontal row of elements in the periodic table Periodic repeating pattern Ductile able to be drawn into thin wires Luster shine Malleable able to be hammered into different shapes Metals elements that have the property of luster, ductility, malleablility, and they are good conductors of heat and electricity Nonmetals elements that have none of the properties of metals Inert or Noble Gases six elements that make up the last group in the periodic table of elements What are the six inert or noble gases? krypton, xenon, radon, neon, helium, and argon Name a few chemical changes. Gas burning into mechanical energy. Digestion in your body. Iron rusting. Burning of wood, paper, coal, etc. Chapter 12, 13-1, and 13-2