1. 1. General Rules 2. Rules regarding Heating & Mixing 3. Rules regarding Accidents

2. Entry Windows & Doors Carrying out of experiments Apparatus-handling -cleaning up -storage Chemicals-handling - usage - disposal Work habits

3. wear goggles put flammable substances away from naked flames point mouth of test tube away from myself and others

4. Report immediately all accidents Chemical in the Mouth -spit out into sink and rinse mouth with plenty of water Chemical in the Eye or on any part of the body -rinse with plenty of water

5. Look at the picture in the next slide. Identify the potential dangers.

6. Susan Shamala Ali Alice Meng Tat Mike Sleeping in the laboratory Playing in the laboratory Hair may catch fire if not tied up The chemicals in the pipette may enter the mouth Tampering with faulty electrical components Pointing the mouth of the test tube which is being heated towards herself Spillage of liquids on the bench

7. Containers of dangerous chemicals are labelled with special symbols to warn others about the hazardous nature of the chemicals. SymbolType of Proper handling hazardous substances Flammable substances Example: petrol, alcohol, kerosene Keep flammable substances away from fire or any heat source.

8. Explosive substances Example: mixture of hydrogen and air Explosive substances usually explode when heated or lit. Use them according to the instructions given. Corrosive substances Example: strong acids and alkalis Avoid direct contact with the corrosive substances which can cause burns. Wash off any substance on your skin or clothes with plenty of water.

9. Poisonous or toxic substances Example: mercury, cyanide, chlorine Do not eat, drink or taste these poisonous substances. Use them according to the instructions given. Irritating or stimulative substances Example: chloroform, alcohol, bromine vapour, fumes from concentrated sulphuric acid Avoid inhaling the vapour of such substances. Use them in a fume chamber.

10. Radioactive substances Example: radioactive carbon, uranium, plutonium Strictly adhere to all safety precautions when handling radioactive substances. ! This danger sign warns you to be careful. For example, when smelling an unknown gas, fan a small part of the gas towards your nose.