Ch. 2-2 Physical Properties of Matter

Physical Properties – a property of matter that can be observed without changing the matter's identity. We use physical properties everyday to identify different types of matter

Examples: Color Size Odor Shape Hardness Texture (soft, smooth, or rough) Luster (metallic, glassy, shiny, dull) State – the physical form in which a substance exists Conductivity – the ability to conduct electricity or heat

More Examples: Melting Point - the temperature at which the solid melts to become a liquid Boiling Point – the temperature at which a liquid starts to boil

Malleability – the ability of a substance to be pounded or rolled into thin sheets ex. – tin foil Ductility – the ability of a substance to be stretched or pulled into a wire ex. - copper stretched into a wire

Mass – the amount of matter in an object Volume – the amount of space taken up by an object Density – the amount of matter in a given space or volume

Formula for calculating Density: v

Sample Problem: A baseball has a mass of about 150 g. It's volume is 50 cm3. What is it's density?

Answer: 150 g divided by 50 cm3 = 3 g / cm3

Sample Problem: What is the volume of a brick with a length of 30 cm, a width of 15 cm, and a heigth of 8 cm? (Hint – L x W x H )

Answer: 30 x 15 x 8 = 3600 cm3

Physical Change – a change that affects one or more physical properties of a substance Examples : A popcicle melting (solid to a liquid) Crushing a metal can Making wood chips from a piece of wood Dissolving sugar in iced tea