Grade 9 Applied Science – Unit 2 Chemistry

Safety in the Lab

Lesson 1

Safety is paramount in a science lab. Safety includes safe chemical storage, safe chemical use, proper use of equipment, safety equipment and partner work.

Scavenger Hunt

·  Sketch a map of the science lab noting the location of desks, lab benches and other furniture

·  On your map, locate each of the following safety equipment. Use the number to note the location of the equipment on your map.

1.  Fire extinguisher

2.  Fire blanket

3.  Fire alarm

4.  Safety goggles

5.  Aprons

6.  Eyewash station

7.  Exits

8.  Telephone

9.  Disposal container for broken glass

10.  Disposal container for chemicals

11.  Fume hood

WHMIS and Hazardous Household Product symbols

·  Examine the following symbols

·  Identify the meaning of each symbol

·  Complete the following table identifying the safety concern and precautions

Table 1. WHMIS Symbols

Symbol / Meaning / Concern / Precautions


Table 2. Household Hazardous Products symbols

Symbol / Meaning

Questions

1.  Why is it important to use a standard set of safety symbols when labeling substances?

2.  Briefly describe what you would do if your skin on your arm came in contact with a corrosive chemical.

3.  Is it always safe to pour waste chemicals down the sink with lots of water? Provide two reasons with your answer.

4.  Why do hairdressers wear rubber gloves when colouring or chemically straightening hair?


Safety in the Lab – Answer Sheet

WHMIS and Hazardous Household Product symbols

·  Examine the following symbols

·  Identify the meaning of each symbol

·  Complete the following table identifying the safety concern and precautions

Table 1. WHMIS Symbols

Symbol / Meaning / Concern / Precautions
/ Compressed Gas / Could explode due to pressure OR if dropped or heated
Explosion may release contents / Ensure container is secured
Store in designated areas
Do not drop
/ Flammable or Combustible / May ignite spontaneously
May release flammable products if allowed to degrade or exposed to water / Avoid heating
Avoid sparks and flames
Ensure electrical sources are safe
Store in designated areas
/ Oxidizing materials / Can cause burns to skin and eyes
Increased fire and explosion hazard
May cause combustibles to explode or react violently / Store oxidizers in containers that will not rust or oxidize
/ Toxic Materials – Immediate and Severe Hazard / May be fatal if ingested or inhaled
May be absorbed through the skin
Small volumes have a toxic effect / Avoid breathing dust and vapours
Avoid contact with skin or eyes
Work in well ventilated areas
/ Toxic Materials – Long Term Concealed / May cause permanent injury or death
May cause birth defects or sterility
May cause cancer
May be sensitizers causing allergies / Avoid direct contact
Wear appropriate personal protection
Use hand, body, face and eye protection
/ Biohazardous Infectious Materials / May cause anaphylactic shock
Includes viruses, yeasts, molds, bacteria, and parasites that affect humans
Includes fluids that contain toxic substances
Includes cellular components / Special training required to handle these materials
Avoid forming aerosols
Avoid breathing vapours
Avoid contamination of people and work area
/ Corrosive Materials / May irritate eyes and skin on exposure
May cause severe burns to tissue upon longer exposure
May damage lungs if inhaled
May cause blindness if contact with eyes
May cause serious environmental damage as a result of fumes / Avoid all direct body contact
/ Dangerously Reactive Materials / May react with water
May be chemically unstable
May explode if exposed to heat or shock
May release toxic or flammable vapours
May vigorously polymerize
May burn unexpectedly / Handle with care, avoiding vibrations, shocks, and sudden temperature changes
Store in appropriate containers
Ensure storage containers are sealed

Table 2. Household Hazardous Products symbols

Symbol / Meaning
/ Flammable
/ Toxic
/ Corrosive
/ Explosive