F.3 Chem -- Section One

1. F.3 Chem -- Section One Safety in Laboratory

2. 1.3 Laboratory safety • 1 Do not enter the laboratory unless a teacher is present. • Safety rules about working and behaving in the laboratory: • 2 Do not run or play in the laboratory. • 3 Do not remove anything from the laboratory without your teacher’s permission.

3. Fig. 1.6aUse a spatula to transfer solid chemicals Fig. 1.6bThe correct wayof smelling a gas 1.3 Laboratory safety • 4 Never use your bare hands to transfer chemicals. Use a spatula or spoon. • Safety rules about working and behaving in the laboratory: • 5 Never leave experiments unattended. • 6 Never smell gases directly - fan a little of the gas towards your nose.

4. Fig. 1.6cPoint the mouthof a test tube away from anyone when holding thetest tube for heating 1.3 Laboratory safety • 7 Never look directly down the test tube or point the mouth of the test tube towards anyone when heating. • Safety rules about working and behaving in the laboratory: • 8 Never taste anything without teacher’s permission.

5. 1.3 Laboratory safety • 9 Never eat or drink in the laboratory. • Safety rules about working and behaving in the laboratory: • 10 Do not put solid substances into the sink. • 11 Always follow strictly the instructions given by your teacher.

6. Fig. 1.6dWear safety glasses whenever necessary 1.3 Laboratory safety • 12 Always read the label on a reagent bottle carefully to make sure it contains the chemical you want. Put the bottle in its original place immediately after use. • Safety rules about working and behaving in the laboratory: • 13 Wear safety glasses whenever necessary.

7. 1.3 Laboratory safety • 14 Always handle flammable substances with great care and keep them away from flames. • Safety rules about working and behaving in the laboratory: • 15 Always handle concentrated acids and alkalis with great care. • 16 Report all accidents and breakages to your teacher. If any chemicals get onto your skin or clothing, wash the affected area with plenty of water.

8. 1.3 Laboratory safety • 17Turn off the Bunsen burner when it is not in use. • Safety rules about working and behaving in the laboratory: • 19 Dispose chemical wastes and excess materials according to your teacher’s instruction. • 19 Always wash your hands thoroughly after experiments.