1. Ch.2, Sec.2 – Physical Properties  physical property: a characteristic of a substance that does not involve a chemical change, such as density, color, or hardness -There are many physical properties an object can have, but here are 6 you may not have heard of: 1. thermal conductivity – the rate at which a substance transfers heat. (Styrofoam is a poor conductor & metal is an excellent conductor)

2. Ch.2, Sec.2 – Physical Properties 2. solubility – the ability of a substance to dissolve in another substance. (salt, sugar) 3. state – the physical form in which a substance exists. (solid, liquid, gas, plasma, Bose-Einstein condensate)

3. Ch.2, Sec.2 – Physical Properties 4. ductility – the ability of a substance to be pulled into a wire. (gold, silver, copper) 5. malleability – the ability of a substance to be rolled or pounded into thin sheets. (gold, silver, lead, aluminum)

4. Ch.2, Sec.2 – Physical Properties 6. density – mass per unit volume of a substance & pressure/temperature can change a substance’s density. (lead, gold, platinum) D = M ÷ V

5. Ch.2, Sec.2 – Physical Properties

6. Density – Which object has more density: a Liberty Mutual soft golf ball or a black/yellow bouncy ball? ______________ Black/Yellow Bouncy Ball: m=__________, volume=__________ D=__________ D=__________ Liberty Mutual White Ball: m=__________, volume=__________ D=__________ D=__________

7. Ch.2, Sec.2 – Physical Properties  physical change: a change of matter from one form to another without a change in chemical properties Examples: boiling / freezing / evaporating water, breaking glass, chopping wood, ripping / crumpling paper