PROPERTIES OF MATTER Physical and Chemical Properties

B. Properties of Matter 1.Physical Properties A characteristic which IDENTIFIES a substance WITHOUT changing its chemical composition Two Types: Extensive Properties Intensive Properties

a. Extensive Property - A property which depends on HOW MUCH or the AMOUNT of substance which is present - EXAMPLES: Size, Mass, Weight, Volume

b.Intensive Properties - A property which does not depend on quantity (amount) _ EXAMPLES: odor, color, density, melting/boiling point,

2. Chemical Properties - Property which describes HOW a substance BEHAVES or REACTS with another substance. - The chemical composition of the substance WILL CHANGE - EXAMPLES: combustion, corrosion, decomposition, gas/precipitate formation

MATTER IS ALWAYS CHANGING….. C. PHYSICAL CHANGE VS. CHEMICAL CHANGE 1. Physical Change – A change that does not change the composition of the substance. EXAMPLES: change in size, shape, phase change (s, l, g)

2. Chemical Change – A reaction in which the composition of a substance is changed. EXAMPLES: Rust (corrosion) Burn (combustion) How do you know if a chemical change has occurred?

SIGNS OF A CHEMICAL REACTION: a. Color change b. Gas formation – bubbles c. Precipitate forms – solid in solution d. Heat is absorbed or released. Can be detected by a change in temperature

PHYSICAL VS. CHEMICAL Physical Property/Change The composition of the substance does not change Extensive Properties: depends on how much or amount of substance. Ex. Mass, weight, volume, length Intensive Properties: does not depend on the amount. Ex. Color, odor, density, Physical Change: size, shape, phase Chemical Property/Change The composition of the substance DOES change Describes the behavior or how reacts with other substances Ex. Burn, rust, decompose Chemical Change: gas/bubbles, solid precipitate forms, color change, temperature change