Unit 3 – Chemistry
Section 1
Lesson 2 - Safety
In this lesson you will:
• Demonstrate a knowledge of WHMIS standards by selecting and
applying proper techniques for handling and disposing of lab
materials.
• Describe the WHMIS information system and its use.
• Identify the eight WHMIS symbols.
• Describe the MSDS sheet and its use.
• Identify the nine categories on a MSDS sheet.
Safety Standards
• HHPS which stands for Hazardous Household
Products Symbols (p 176)
– There are four of these used on household products.
Corrosive
Explosive
Poison
Flammable
Note: Greater the number of
corners the more dangerous the
substance
WHIMIS
• WHMIS (Workplace Hazardous
Materials Information System)
– designed to warn people of the hazards
associated with chemical substances in
the workplace.
– a set of 8 symbols to indicate the potential
hazards posed by chemicals used in the
workplace and in educational institutions.
WHMIS is LAW
in CANADA
NOTE: Each Symbol is enclosed in a circle.
WHMIS Symbols
Compressed Gases
examples: natural gas, propane
Flammable and Combustible Materials
examples: white phosphorus, butane, acetone
(cleaner/solvent)
Oxidizing Material
examples: peroxides, chlorates, acids
containing oxygen
WHMIS Symbols Cont.
Materials Causing Immediate and
Serious Toxic Effects
examples: methanol (gas line
antifreeze), ethylene glycol (engine
coolant), cyanides, sulfuric acid (battery
acid)
Materials Causing Other Toxic Effects
examples: asbestos (in some insulating tiles and
floor tiles), toluene (paint stripper), benzene, barium
ions, lead (e.g. car batteries)
Biohazardous Infectious Materials
danger of contraction of a disease
examples: medical waste, blood, bacterial specimens
Corrosive Materials
examples: sulfuric acid, hydrochloric acid (brick
layer's acid), sodium hydroxide (lye, fiber separator
in paper mills)
Dangerously Reactive Materials
examples: sodium metal, trinitrotoluene (TNT), certain cyanides
(gold refining)
MSDS sheets
• Each package of
chemicals purchased
in a school laboratory
comes with a MSDS
(Materials Safety
Data Sheet) which
lists nine categories
or sections of
information.
Department of Transportation Symbols
• Carried as Diamond Shaped Placards on vehicles.
• Number Indicates type of material being transported.
• Law in Canada to have these symbols on vehicles.
Review of Safety
3 levels of symbols
A. Hazardous Household Product Symbols
- 4 symbols enclosed in “cornered” symbols
B. WHMIS
– 8 symbols enclosed in circles
C. DOT symbols
– Symbols are diamond shaped with numbers.
Quiz
1. What is the meaning of the following
symbol?
A. Danger of fire or explosion when exposed to
heat, sparks, flame or friction or upon
contact with water.
B. Danger of an explosion because gas is
under pressure.
C. Danger of fatality if inhaled, swallowed, or
absorbed through skin; may burn skin or
eyes.
D. Danger of contraction of a disease.
2. What is the meaning of the following
symbol?
A. Danger of fire or explosion when exposed to
heat, sparks, flame or friction or upon contact
with water.
B. Danger of an explosion because gas is under
pressure.
C. Danger of fatality if inhaled, swallowed, or
absorbed through skin; may burn skin or eyes.
D. Danger of fire or explosion in presence of
flammable or combustible materials; may cause
burns on contact with skin
3. What is the meaning of the following
symbol?
A. Danger of fire or explosion when exposed to
heat, sparks, flame or friction or upon contact
with water.
B. Danger of an explosion because gas is under
pressure.
C. Danger of fatality if inhaled, swallowed, or
absorbed through skin; may burn skin or eyes.
D. Danger of fire or explosion in presence of
flammable or combustible materials; may cause
burns on contact with skin.
4. What is the meaning of the following
symbol?
A. Danger of fire or explosion when exposed to heat,
sparks, flame or friction or upon contact with
water.
B. Danger of an explosion because gas is under
pressure.
C. Danger of fatality if inhaled, swallowed, or
absorbed through skin; may burn skin or eyes.
D. Danger of release of toxic or flammable gas upon
contact with water; may explode as a result of
disturbance, friction, increase in temperature; may
react rapidly release large amounts of heat.
5. What is the meaning of the following symbol?
A. Danger of contraction of a disease.
B. Danger of an explosion because gas is under
pressure.
C. Danger of fatality if inhaled, swallowed, or absorbed
through skin; may burn skin or eyes.
D. Danger of fire or explosion when exposed to heat,
sparks, flame or friction or upon contact with water.
6. Which is normally part of an MSDS Sheet?
A. Name of the material.
B. Information regarding physical properties.
C. Fire and explosion hazard data.
D. All of the above are part of an MSDS sheet.
7. Which acronym is not properly matched with its
meaning?
A. WHMIS (Workplace Hazardous Materials Information System).
B. HHPS (Hazardous Household Products Symbols).
C. DOT (Department of Tourism).
D. MSDS (Materials Safety Data Sheet).
Homework
• Complete Activity #4 from the lesson in
WebCT.
• Submit your activity sheet via email.
Periodic Table of Elements
• Begin by investigating the characteristics
of the first 20 elements found on the
periodic table.
– Name, Symbol, and Atomic Number.
• http://www.webelements.com/