Clamp holders Metal clamp Ring Bunsen burner Wire gauze DANGEROUS SUBSTANCES Explosive Oxidiser Corrosive Flammable Toxic Harmful or irritant Clamp clips Stand Before you star t ⇒ Make a note of where the exits and the emergency equipment are located. ⇒ Don't move around the laboratory more than necessary. Don't run or play. ⇒ Don't eat, drink or chew gum. ⇒ Clear away any clothes and books that you won't need. At the end ⇒ If you need to throw something away, ask your teacher how to do it to avoid contamination. ⇒ Leave the equipment clean and tidy. Put all products in the correct place. Place containers in the cupboard with their labels facing forward. ⇒ Wash your hands before leaving the laboratory. During the experiment ⇒ Only do the experiments that your teacher tells you to do. Don't try to do tests on your own. ⇒ Only have the necessary materials on the table. ⇒ Don't touch any unknown products. If any container does not have a label, don't use it. ⇒ If you need to heat a test tube, hold it with a clamp and keep it at an angle. Always point the mouth of the test tube away from you and other people. ⇒ Use clean tools to take a product out of a container to avoid contaminating the rest of the contents. ⇒ Close the containers immediately after use. Be caref u l ⇒ Use gloves and safety goggles when necessary. ⇒ Don't touch, smell or taste any laboratory products. ⇒ Never use your mouth to suck up liquids. Always use a pipette with a pipette filler. ⇒ Handle electrical equipment carefully and never with wet hands. ⇒ Don't use anything with broken glass. If you break anything, tell your teacher. 25 What safety measures will you need to include in your experiment? 26 Do you need laboratory equipment? Which items? L A B O R A T O R Y S A F E T Y R U L E S 6. Laboratory work CHALLENGE 24
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