Clean up all spills - both of liquids and of solids. Equipment is available. Use only equipment that is free of flaws such as cracks, chips, frayed wire, and obvious defects. Replace all defective glassware at the stockroom. Apparatus attached to a ring stand should be positioned so that the center of gravity of the system is over the base and not to one side or behind the base.
Most chemicals are harmful to some degree.
Avoid direct contact with any chemical. It is especially important to keep chemicals from hands, face, arms, legs, clothing and shoes. Wash thoroughly with soap and warm water whenever a chemical contacts your skin. Never smell a chemical directly. When instructed to smell something, bring a small sample of the vapor to your nose by means of your cupped hand.