WARM-UP #1 Complete the following Element #protons (AN) #electrons Mass #neutrons (M-AN) Barium (Ba) Potassium (K) Sodium (Na)

WARM-UP #2 How many atoms of each element in the following compounds? 1) hydrogen phosphate - 2H3PO4 2) diethyl sulphate - (C2H5)2SO4

Physical and Chemical Properties

Physical Properties Characteristics of a substance State (solid liquid or gas0 Colour Clarity (opaque translucent or transparent) Example, describe the physical properties of a ceiling tile: Solid white, opaque, brittle, not ductile

Chemical Properties Characteristics of a substance when it changes to a new substance Examples Hydrogen is explosive HCl is Corrosive Sodium is very reactive in water

Physical Change A physical change is a change in a material that does not change the materials properties. The atoms vibrate more or less sot hey move further apart or closer together Evidence of a physical change Change in temperature Change in state Change in form

Chemical Change During a chemical change a new substance is formed. The electrons of one atom transfer to another atom or the electrons are shared by the atoms. It is harder to reverse than a physical change Evidence Change in colour Bubbles of gas produced Precipitate formed Heat produced Light produced

Classify each as physical or chemical Colour  physical Flammability  Chemical State  physical Boiling point  physical Malleability  physical Reaction with water  chemical Flash point  lowest temp at which a liquid can form an ignitable moisture in air near the surface of the liquid, lower flash point equals easier to ignite. physical Solubility physical Conductivity physical

Safety Systems

HHPS Hazardous Household Product Symbols On products found at home Poisonous, flammable, explosive, corrosive Simple

WHMIS Workplace Hazardous Materials Information System On all products containing hazardous substances in all workplaces 8 symbols all in circles for different hazards Can also have written cautions

MSDS Material Safety Data Sheet In all workplaces for every product No symbols Lots and lots and lots of information!