What is the most useful chemical?
Water (H2O) – No explanation is needed as to how important water is in our life. Water plays many important roles in the body including flushing waste from the body, regulating body temperature, transportation of nutrients and is necessary for digestion. Basically, water is something that could help us survive even if we don't have anything else. Sodium Chloride or Table Salt (NaCl) – Salt is used not only in cooking, but in cleaning as well.
What is a useful chemical reaction?
Most of the changes that we see in the natural world around us are caused by chemicals reactions, such as the changing leaves and the growth of a flower.Chemical reactions that are used to make new materials include: Water and carbon dioxide reacting to form glucose and oxygen. The conversion of glucose into carbon dioxide and water. The reaction of polyisocyanate and polyol to form polyurethane. The reaction between magnesium and copper sulfate.