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.
If a few drops of water are added to a mixture of solid silver nitrate and powdered magnesium the mixture bursts into flames. The water dissolves the silver nitrate to make a highly concentrated solution. An exothermic displacement reaction occurs which ignites any excess magnesium.
An element can combine with one or more other elements to form compounds, of which there are millions. For example, one of the best known compounds is water, written chemically as H 2 0, which means that water is made of two atoms of hydrogen combined with one of oxygen.