Shortages (in the technical sense) may be caused by: 1  Price ceilings, a type of price control which involves a government-imposed limit on the price of a product service. 2  Anti-price gouging laws. 3  Government ban on the sale of a product or service, such as prostitution or certain recreational drugs.
Noun. 1. addition reaction-a chemical reaction in which one molecule is added to another. chemical reaction, reaction - (chemistry) a process in which one or more substances are changed into others; there was a chemical reaction of the lime with the ground water. 1  Facebook. 2  Twitter.
A displacement reaction is one in which an element or group is displaced from a chemical compound by another element or group. In single displacement reactions, the more reactive element displaces the less reactive one.ingle displacement reactions include the replacement of a metal in a salt with a more reactive metal. For example, iron will displace copper from a copper sulfate solution because it is more reactive: Fe+ CuSO 4 4. This type of reaction can be used for metal plating.