To start…

Define the following words using your textbook:

• Qualitative

• Quantitative

• Independent variable (p 534)

• Dependent variable (p 534)

Lab Safety

What are the safety features of a science lab room?

The number one rule in a science lab is to ….

FOLLOW INSTRUCTIONS

When conducting an experiment:• Keep your work station orderly to avoid

accidental spills and mishaps

• Always wear your safety goggles when ANYONE in the lab is working with chemicals (even if they make you look less cool)

• Long hair should be tied back in a pony-tail

• Baseball caps should be removed (but that is school policy now anyhow)

• Be mindful of what you are handling, don’t spill unknown liquids on your skin

• Never sniff a gas, use the “waft” test to determine if there is an odour (if that is required)

• In future classes you may need lab coats, fume hoods and more…

WHMISWorkplace Hazardous Materials Information System

The level of danger

Like street signs have shapes to indicate the level of danger or threat, these symbols are added to

the WHMIS symbols for the same reason.

The octagon is the most dangerous, the triangle is the least dangerous.

So what do all the symbols mean?

Let’s examine them…

Compressed Gas

•poses an explosion danger because the gas is being held in a cylinder under pressure •may cause its container to explode if heated in a fire •may cause its container to explode if dropped

Flammable and Combustible Material

• will burn and is therefore a potential fire hazard • may burn at relatively low temperatures; flammable materials catch

fire at lower temperatures than combustible materials • may burst into flame spontaneously in air or release a flammable

gas on contact with water • may cause a fire when exposed to heat, sparks, or flames or as a

result of friction

Oxidizing Material

•poses a fire and/or explosion risk in the presence of flammable or combustible material •may cause fire when it comes into contact with combustible materials such as wood •may react violently or cause an explosion when it comes into contact with combustible materials such as fuels •may burn skin and eyes upon contact

Corrosive Material

•causes severe eye and skin irritation upon contact •causes severe tissue damage with prolonged contact •may be harmful if inhaled

Dangerously Reactive Material

is very unstable may react with water to release a toxic or flammable gas may explode as a result of shock, friction or increase in

temperature may explode when heated when in a closed container

undergoes vigorous polymerization

Biohazardous Infectious Material

•may cause a serious disease resulting in illness or death •may produce a toxin that is harmful to humans

Poisonous and Infectious Materials causing immediate and serious toxic effects

•is a potentially fatal poisonous substance •may be fatal or cause permanent damage if it is inhaled or swallowed or if it enters the body through skin contact •may burn eyes or skin upon contact

Poisonous and Infectious Material causing other toxic effects

is a poisonous substance that is not immediately dangerous to health may cause death or permanent damage as a result of repeated exposures over

time may be a skin or eye irritant

may be a sensitizer which produces a chemical allergy may cause cancer

may cause birth defects or sterility

These are the industrial symbols that we use in science labs

However, some companies have their own symbols, like

the skeletal hand for “corrosive material”. When examining products around the home, you will note they

don’t always use the standard WHMIS symbols.

Poison Flammable Explosive Caustic

Poison Flammable Explosive Caustic

Poison Flammable Explosive Caustic