Definition of natural disaster : a sudden and terrible event in nature (such as a hurricane, tornado, or flood) that usually results in serious damage and many deaths The earthquake was one of the worst natural disasters of this century.
Synthesis, Chemical. the planned production of complex compounds from simpler compounds based on a knowledge of the reactantsâ chemical structure and reactivity. Chemical synthesis usually implies a sequence of several chemical processes (steps). In the early period in the development of chemistry, chemical synthesis was carried out mainly for inorganic compounds and was fortuitous in nature.
Synthesis Reaction. The word 'synthesis' means to put together. In a synthesis reaction two substances combine to produce a single product. The general chemical equation for a synthesis reaction is A + B AB. The reaction of a metal with a non-metal to produce a compound is an example of a synthesis reaction.