4 The Properties of Matter Extensive properties – depend on the amount of matter that is presentExample – volume, mass, amount of energy in the substanceIntensive properties – do not depend on the amount of matter that is presentExample – melting point, boiling point, density
5 Substance – matter that is uniform and has a definite composition All samples of an identical substance have the identical physical and chemical propertiesPhysical property – quality or condition of a substance that can be observed or measured without changing the substance’s composition
6 Properties of MatterWhen a substance undergoes a physical change, its physical appearance changes.Ice melts: a solid is converted into a liquid.Physical changes DO NOT result in a change of composition.
7 Examples of Physical Properties ColorOdorHardnessDensitySolubilityMelting point, boiling point, freezing pointPhysical state – solid, liquid, gas
8 Page 40 Table 2.1 Physical properties of some substances
9 States of matter Solid (s) Liquid (l) Gas (g) Plasma – we don’t deal with
10 Classification of Matter States of MatterMatter can be a gas, a liquid, or a solid.Gases have no fixed shape or volume.Gases can be compressed to form liquids.Liquids have no shape, but they do have a volume.Solids are rigid and have a definite shape and volume.
11 Gas and vapor not the same Gas – normally exists that way at room temperatureVapor – gas state of a substance that is normally a liquid or solid at room temperature
12 Physical changeA change which alters a material without changing its compositionCutting, grinding, melting, boiling, freezing, dissolving