1. Safety Briefing Secondary Ones

2. How could this accident have been prevented?
Secondary One – Safety Briefing
How could this accident have been prevented? 2

3. Secondary One – Safety Briefing
Laboratory rules
Throughout the lesson
Be serious at all times in the Science laboratory. Do not play or tamper with the equipment.
Keep your desk clean and tidy.
Before you begin the experiment
Prepare all apparatus and arrange them such that you will not knock them over while doing the experiment. 3

4. Secondary One – Safety Briefing
During the experiment
Never smell or taste chemicals unless your teacher grants permission.
Wear goggles when heating or mixing reactive chemicals.
Never handle broken glass apparatus with your bare hands. Inform your teacher and use a broom and dustpan to remove the broken glass. 4

5. Secondary One – Safety Briefing
After the experiment
Dispose of waste materials in proper waste bins.
Never throw solids or corrosive liquids in the sink.
Wash your hands thoroughly when the experiment is completed.
Failure to observe any of these safety precautions can lead to accidents such as a fire. 5

6. Secondary One – Safety Briefing
What should you do if a chemical spillage occurs?
If any chemical accidentally gets in your mouth, spit it out into a basin immediately. Rinse your mouth with plenty of water and report it to your teacher.
If any chemicals spilled onto other parts of your body or clothing, wash it with plenty of water.
Report the spill to your teacher.
Report all accidents, breakage and spillage to your teacher immediately. 6

7. Secondary One – Safety Briefing
Hazard symbols
Hazard symbols are used to label harmful chemicals.
Here are some common hazard symbols to look out for:
Explosive
Substance will react violently when heated or struck.
E.g. flash powder
Corrosive
Substance will eat away other substances.
E.g. sulfuric acid, potassium hydroxide, calcium oxide 7

8. Secondary One – Safety Briefing
Radioactive
Substance emits radiation.
E.g. radioactive carbon, uranium
Flammable
Substance catches fire easily.
E.g. petrol, kerosene, alcohol, hydrogen
Biohazardous
Poisonous substance of a biological nature.
E.g. medical waste such as blood and urine samples, micro-organism, virus or toxin 8

9. Secondary One – Safety Briefing
Irritant
Substance produces vapours or fumes which irritate the eyes, nose and throat.
E.g. phenol, chloroform
Toxic
Substance is harmful in small doses.
E.g. methanol, cyanide, mercury, carbon monoxide, chlorine 9

10. Now to do Worksheet 1.3 in your Theory Workbook.
Secondary One – Safety Briefing
Now to do Worksheet 1.3 in your Theory Workbook. 10