Avoid raising dust. Wear a filter mask if needed. Wet powder if needed, but do not use water if the powder is water-reactive. Some powders can be placed in normal trash. See the UW Chemical Safety and Disposal Guide for specific disposal procedures.
Liquids are to be absorbed or neutralized at the site of the spill.
Acids may be contained with spill booms. Use sodium bicarbonate to neutralize most acid spills. Sprinkle it on the spill from the outer edges inward. When the pH is neutral, the residue is safe to dispose.