failure or refusal to comply, as with a law, regulation, or term of a contract. Origin of noncompliance. 1680-1690. First recorded in 1680-90; non- + compliance.
The main cause of chemical burns is from contact with strong acids or bases. The strength of acids and bases is defined by the pH scale, which ranges from 1-14. A very strong acid has a pH of 1 and may cause a severe burn. A very strong base has a pH of 14 and may also cause a severe burn. A substance with a pH of 7 is considered neutral and does not burn. Chemical burns from acids or bases are also referred to as caustic burns.
Reaction of metals and water (General) A few very reactive metals will react with cold water. Potassium's reaction is the most violent that you are likely to encounter in the science lab. Potassium, sodium, lithium and calcium all react very fast when placed in water. The products of the reaction in each case are a metal hydroxide (froming an alkaline solution) and hydrogen gas. The chemical equation for potassium reacting with water is: 2K + 2H2O â 2KOH + H2. (potassium + water â potassium hydroxide (an alkali) + hydrogen) Magnesium requires the water to be in the form of steam for a clearly observable reaction to take place.