Define combination reaction.

Reactions in which two or more elements or compounds react to form a single product. they are generally exothermic in nature. such as burning of natural gas- CH4------>CO2+H2O+heat respiration- C6H12O6+6O2------6H2o+6Co2+energy. this energy helps in maintaining body temperature. decomposition of organic matter. CaO+h2O----->Ca(OH)2. highly exothermic. applied to walls which react with co2 to produce caco3 which gives a shiny finish. slow reaction. are also known as synthesis reactions and are endothermic in nature