Lesson 1: Emissions by Sector Figure ES-14: U.S. Greenhouse Gas Emissions Allocated to Economic Sectors (MMT CO2 Eq.) 2,500 Electric Power Industry (Purple) 2,000 Transportation (Green) 1,500 Industry 1,000 Agriculture 500 Commercial (Orange) Residential (Blue) Source: Environmental Protection Agency 2017 2016 2014 2013 2012 2011 2010 6002 8007 2002 9007 2661 9661 S661 661 E661 1661 066 MMT CO2 Eq.
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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