Always wear safety goggles to protect your eyes in any activity involving chemicals, flames or heating, or the possibility of broken glassware.
You are working with materials that may be breakable, such as glass containers, glass tubing, thermometers, or funnels. Handle breakable materials with care. Do not touch broken glassware.
Use an oven mitt or other hand protection when handling hot materials. Hot plates, hot glassware, or hot water can cause burns. Do not touch hot objects with your bare hands.
Use a clamp or tongs to pick up hot glassware. Do not touch hot objects with your bare hands.
Pointed-tip scissors, scalpels, knives, needles, pins, or tacks are sharp. They can cut or puncture your skin. Always direct a sharp edge or point away from yourself and others. Use sharp instruments only as instructed.
Avoid the possibility of electric shock. Never use electrical equipment around water, or when the equipment is wet or your hands are wet. Be sure cords are untangled and cannot trip anyone. Disconnect the equipment when it is not in use.
You are working with an acid or another corrosive chemical. Avoid getting it on your skin or clothing, or in your eyes. Do not inhale the vapors. Wash your hands when you are finished with the activity.
Do not let any poisonous chemical come in contact with your skin, and do not inhale its vapors. Wash your hands when you are finished with the activity.
When an experiment involves physical activity, take precautions to avoid injuring yourself or others. Follow instructions from the teacher. Alert the teacher if there is any reason you should not participate in the activity.
Treat live animals with care to avoid harming the animals or yourself. Working with animal parts or preserved animals also may require caution. Wash your hands when you are finished with the activity.
Handle plants in the laboratory or during field work only as directed by the teacher. If you are allergic to certain plants, tell the teacher before doing an activity in which those plants are used. Avoid touching harmful plants such as poison ivy, poison oak, or poison sumac, or plants with thorns. Wash your hands when you are finished with the activity.
You may be working with flames from a lab burner, candle, or matches. Tie back loose hair and clothing. Follow instructions from the teacher about lighting and extinguishing flames.
Flammable materials may be present. Make sure there are no flames, sparks, or other exposed heat sources present.
When poisonous or unpleasant vapors may be involved, work in a ventilated area. Avoid inhaling vapors directly. Only test an odor when directed to do so by the teacher, and use a wafting motion to direct the vapor toward your nose.
Chemicals and other laboratory materials used in this activity must be disposed of safely. Follow the instructions from the teacher.
Wash your hands thoroughly when finished with the activity. Use antibacterial soap and warm water. Lather both sides of your hands, and between your fingers. Rinse well.
General Safety Awareness
You may see this symbol when none of the symbols described earlier appears. In this case, follow the specific instructions provided. You may also see this symbol when you are asked to develop your own procedure in a lab. Have the teacher approve your plan before you go further.