Grade 9 Applied Science Unit 1 Lesson 2 Safety in the Lab

Transcription

1 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 Precautions

2

3

4 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?

5 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.

6 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 Precautions Compressed Gas Flammable or Combustible Could explode due to pressure OR if dropped or heated Explosion may release contents May ignite spontaneously May release flammable products if allowed to degrade or exposed to water Ensure container is secured Store in designated areas Do not drop Avoid heating Avoid sparks and flames Ensure electrical sources are safe Store in designated areas

7 Oxidizing materials Can cause burns to skin and eyes Increased fire and explosion hazard Store oxidizers in containers that will not rust or oxidize Toxic Materials Immediate and Severe Hazard Toxic Materials Long Term Concealed 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 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 Biohazardous Infectious Materials 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 Special training required to handle these materials Avoid forming aerosols Avoid breathing vapours Avoid contamination of people and work area

8 Corrosive Materials Includes cellular components May irritate eyes and skin on exposure Avoid all direct body contact May cause severe burns to tissue upon longer exposure May damage lungs if inhaled May cause blindness if contact with eyes Dangerously Reactive Materials 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 Handle with care, avoiding vibrations, shocks, and sudden temperature changes Store in appropriate containers Ensure storage containers are sealed May vigorously polymerize May burn unexpectedly

9 Table 2. Household Hazardous Products symbols Symbol Meaning Flammable Toxic Corrosive Explosive