Safety in the Lab

advertisement

Grade 9 Applied Science – Unit 1 Lesson 2

Safety in the Lab

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 Pr e cautions

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?

Grade 9 Applied Science – Unit 1 Lesson 2

Kitchen Chemistry Lab #2

Your kitchen can be considered a chemical laboratory. There are many different chemicals is solid and liquid state. To make food, they are mixed together and sometimes heated. During this process, changes in matter can occur.

NOTE: Some household chemicals can form dangerous products when mixed.

Materials

?

Three plates

?

Masking tape

?

Marking pen

?

Table salt (Sodium chloride)

?

Powdered stratch

?

Baking soda (Sodium bicarbonate)

?

Vinegar (Acetic acid)

?

Iodine solution

?

Water

?

Three micro-droppers

SAFETY – Wear safety goggles when using iodine solution

Procedure

1. Using the masking tape and marking pen, label the plates as follows: A –

Salt; B – Starch and C – Baking Soda

2. On Plate A, make three small piles of salt of one teaspoon each. The piles should not touch.

3. Repeat Step #2 for Plate B using starch and Plate C using baking soda

4. Fill a micro-dropper with vinegar. Place 3-5 drops of vinegar on one of the piles on each of the three plates. Record your observations.

5. Fill a second micro-dropper with iodine solution. Repeat Step #4 placing

3-5 drops on a different pile on each of the three plates. Record observations.

6. Fill a third micro-dropper with water. Repeat Step #4 placing 3-5 drops on a different pile on each of the three plates. Record observations.

Questions

1. Which substance caused a change in the table salt? Did a new substance form during any test?

2. Which substance caused a change in the starch? Did a new substance form during any test?

3. For the baking soda, did a new substance form during any test? Provide a reason for your observations.

Grade 9 Applied Science – Unit 1 Lesson 2

Safety in the Lab – Answer Sheet

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.

12. Fire extinguisher

13. Fire blanket

14. Fire alarm

15. Safety goggles

16. Aprons

17. Eyewash station

18. Exits

19. Telephone

20. Disposal container for broken glass

21. Disposal container for chemicals

22. 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 Pr e cautions

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

Toxic Materials

– Immediate and Severe

Hazard

Toxic Materials

– Long Term

Concealed

Biohazardous

Infectious

Materials

Can cause burns to skin and eyes

Increased fire and explosion hazard

May cause combustibles to explode or react violently

May be fatal if ingested or inhaled

May be absorbed through the skin

Small volumes have a toxic effect

May cause permanent injury or death

May cause birth defects or sterility

May cause cancer

May be sensitizers causing allergies

May cause anaphylactic shock

Includes viruses, yeasts, molds, bacteria, and parasites that affect humans

Includes fluids that contain toxic substances

Store oxidizers in containers that will not rust or oxidize

Avoid breathing dust and vapours

Avoid contact with skin or eyes

Work in well ventilated areas

Avoid direct contact

Wear appropriate personal protection

Use hand, body, face and eye protection

Special training required to handle these materials

Avoid forming aerosols

Avoid breathing vapours

Avoid contamination of people and work area

Corrosive

Materials

Dangerously

Reactive

Materials

Includes cellular components

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

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

Avoid all direct body contact

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

Download