Biofuels such as wood generate carbon dioxide when they are burned, but biofuels are nonetheless considered a partial solution to climate change. Why? Because plants take carbon dioxide out of the air as they grow, and burning them puts the same amount of carbon dioxide back into the atmosphere, so they are "carbon neutral". Because biofuels are more expensive than fossil fuels, so people will use less of them and generate less carbon dioxide. Because wood and other biofuels contain only a small amount of carbon, so they do not generate very much carbon dioxide when burned. Because wood and other biofuels generate a lot of ash when they burn, and this ash in the atmosphere cools down the Earth.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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