From Wikipedia, the free encyclopedia. The environmental impacts of irrigation relate to the changes in quantity and quality of soil and water as a result of irrigation and the effects on natural and social conditions in river basins and downstream of an irrigation scheme.
Combustion reactions can only be exothermic. In chemical reactions, old bonds are broken to form new ones. Depending on the energy difference between broken and formed bonds, the total reaction energy is either positive or negative.
Endothermic reactions absorb energy from the environment, while exothermic reactions release energy to the environment. Distinguish between endothermic and exothermic reactions. 1  All chemical reactions involve the transfer of energy.  Endothermic processes require an input of energy to proceed and are signified by a positive change in enthalpy.