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Physical Change a change is size, shape, phase of matter but the identity of a substance doesn't change Chemical Change a change that transforms one substance into a different substance (when a nail rusts) Chemical Properties properties that can only be observed when one substance changes into a different substance Density d=m/v. depends on how tightly the molecules are packed together Stress caused by amount of force on an object. s=f/a Tensile Strength maximum stress any given encounter an object can obtain without breaking. can also be stretching Pressure acts in all directions. increases with temperature Viscosity property of fluids that causes friction High Viscosity high friction between molecules and is harder to pour Low Viscosity less friction between molecules and is easier to pour Thermal Expansion increased vibration makes each particle take up more space causes ____ Amorphous When particles in a solid are arranged randomly (rubber, wax, glass) Brittleness tendency of a solid to crack or break when forces are applied Buoyancy measure of the upward force a fluid exerts on an object that is immersed Crystalline when the particles in a solid are arranged in an orderly fashion (salts, minerals, metals) Physical Properties characteristics you can see through direct observation (color, texture, etc)