1. General Rules

2. Rules regarding Heating &

Mixing

3. Rules regarding Accidents

• Entry• Windows & Doors• Carrying out of experiments• Apparatus-handling

-cleaning up-storage

• Chemicals-handling-

usage-

disposalWork habits

• wear goggles

• put flammable substances away from naked flames

• point mouth of test tube away from myself and others

• 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

Look at the picture in the next slide.

Identify the potential dangers.

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

Containers of dangerous chemicals are labelled with special symbols to warn others about the hazardous nature of the chemicals.

Symbol Type of Proper handlinghazardous substances

Flammable substancesExample:petrol, alcohol, kerosene

Keep flammable substances away from fire or any heat source.

Explosive substancesExample:mixture of hydrogen and air

Explosive substances usually explode when heated or lit. Use them according to the instructions given.

Corrosive substancesExample: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.

Poisonous or toxic substancesExample:mercury, cyanide, chlorine

Do not eat, drink or taste these poisonous substances. Use them according to the instructions given.

Irritating or stimulative substancesExample:chloroform, alcohol, bromine vapour, fumes from concentrated sulphuric acid

Avoid inhaling the vapour of such substances. Use them in a fume chamber.

Radioactive substancesExample: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.