Matter has observable properties. Section 2.1 Outline Matter has observable properties.

Physical properties describe a substance. Physical property- characteristic of a substance that can be observed without changing the identity of the substance color shape size d) texture e) volume f) mass

A. Physical Properties observing physical properties includes the use of all your senses measuring can be used to determine physical properties

A. Physical Properties (cont.) examples that a physical property does not change a substance stretching a rubber band bending & reshaping clay

B. Density measures the amount of matter in a given volume usually labeled g/cm3 D = mass ÷ volume (m/v)

B. Density (cont.) Determine the density of a box with a mass of 480 grams and a volume of 60 cm3

C. Physical Changes Physical change – a change in any physical property; not the substance itself

C. Physical Changes (cont.) Examples: melting ice cutting paper in half changing wool into a sweater

A. Chemical Properties & Changes Chemical property – describes how substances can form new substances

A. Chemical props. & changes (cont.) Examples Combustibility tells how well something can burn Ability to rust

A. Chemical props. & changes (cont.) Chemical change – one substance changes into another Combination of atoms are rearranged to make new substances

A. Chemical props. & changes (cont.) examples Piece of wood burning Rusting iron Boiling an egg

B. Signs of a Chemical Change If two or more signs are observed, it is most likely a chemical change Production of an odor Change in temperature Change in color Formation of bubbles Formation of a solid