Clean up any spilled chemicals immediately. Consult with your laboratory instructor if you are not sure what to do. Clean up broken glassware immediately. A dustpan and broom are located under a sink in each lab for this purpose. Do not use flammable liquids near open flames.
Most organic liquids are flammable.
Diethyl ether is especially dangerous. Never point the mouth of a test tube at yourself or at anyone else. It may erupt like a geyser. Do not taste anything in the chemistry laboratory. Smell chemicals carefully and only when instructed to do so.