Safety in the LaboratoryUNIT ONE, LESSON 1.6BY MARGIELENE D. JUDAN

LESSON OUTLINELaboratory Safety RulesSafety SignsModern Hazard Safety Signs

Laboratory

-a place where scientists work on with their experiments

LABORATORY SAFETY RULESEye and Face SafetyGlassware SafetySharp Instrument SafetyElectrical SafetyChemical SafetyHeat/Fire Safety

The next slide is a video about how to observe safety guidelines inside the laboratory.

SAFETY SIGNS Be able to identify the signs for your complete protection inside the laboratory.

Combustion-related signsAvoid exposure to heat and open flames as they are flammable and may explode

Flammable or Extremely Flammable

Oxidizing Chemical

Flammable Gas/Liquid

Non Flammable Gas

Organic Peroxide (flammable)

Spontaneously Combustible

Explosive

Poison-related signsAvoid contact and do not inhale. Do not place along with food items.

Poisonous

Corrosive

Irritant or Harmful

Dangerous When Wet

Keep Away from Food Stuffs

Modern biohazardsThese are hazards which came from new advances in science and technology.

Biohazard Safety SignAvoid contact as harmful bacteria may be present. Examples of biohazards are used tissues, saliva, sweat, and other body fluids.

Laser Safety SignDo not enter the room without doctor’s assistance. Power lasers emit radiation and can be hazardous, especially in the human eye.

Ionizing Radiation Safety SignDo not enter the area. There is a large source of ionizing radiation. (ex. X-ray rooms)The body cannot take too much radiation that’s why you cannot take your x-ray exam weekly.

Recitation Time! (10 questions)

1. Imagine this is your group’s lab area. What’s wrong here?

Answer: Unorganized work area

2. What lab safety rule applies to this situation?

Answer: Always have a clean workplace.

3. Which picture accurately shows proper lab safety in the lab? Explain your answer.

Answer: A. Remember to always wear safety googles in the lab to avoid contact of chemicals in the face.

4. What should you do if you break any of the glassware? Should you use the flask below? Why or why not?

Answer: Dispose it immediately in their respective containers. Infectious and non-infectious glass wares should be separated.

Also, Do not use a glass ware with a crack. Dispose it properly. The chemicals might spill and the glass might break when they are heated.

5. If we are conducting an investigation using live animals, how should you treat the animal and why? What should you do after investigating it?

Answer: Be humane. Do not use methods which may hurt and stress the animal. Do not leave them without food and water for more than 24 hours. Handle them with care.

After investigating with them, return them to where you got them, usually in the wild or in an animal laboratory.

6. What’s wrong with this picture? Explain how to smell a substance properly in the lab.

Answer: Do not smell the chemical directly in the mouth of a flask. It may irritate your nose and respiratory tract.To smell, use the fanning method. Fan the air towards your nose to smell the chemical.

7. Taste the substance. What do you think it is? What would happen if you tasted a poisonous one? What safety rule could you apply here?

Answer: An ice cream. Do not taste chemicals. Most of them are poisonous and only for lab purposes.

8. What should you always do before leaving the lab?

Answer: Wash your hands before going out of the lab to get rid of the chemicals in your hands.

9. Class is about to end. What should happen here?

Answer: Clean and return the tools to where you got them. Never leave any spillage or tool on the work place.

10. Based on the picture, what is the proper conduct in the lab?

Answer: Use only the tools according to their proper usage. (ex. Do not use a test tube in place of a reagent bottle. Also, do not expose beaker to very high temperature. Glass wares cannot withstand too much heat. Use a crucible instead, which is ceramic.)

Sources:Science Links 7https://www.ocps.net/cs/services/cs/currareas/sci/IR/lessonplans/MID_LP/001Lab%20Safety%20Station%20Activity_0910.pdf