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Chapter 5 Thermochemistry

Chapter 5 ThermochemistryFigure a match head along a rough surface initiates a combustion reaction that produces energy in theform of heat and light. (credit: modification of work by Laszlo Ilyes) Chapter Energy EnthalpyIntroductionChemical reactions , such as those that occur when you light a match, involve changes in energy as well as ,about85%ofUSenergyconsumptioncamefromth ecombustionofpetroleumproducts,coal,wood , (38%);totransportfood,rawmaterials,manuf acturedgoods,andpeople(27%);for industrial production (21%); and to heat and power our homes and businesses (10%).[1]While these combustionreactionshelpusmeetouressentia lenergyneeds,theyarealsorecognizedbythem ajorityofthescientificcommunityas a major contributor to global climate forms of energy are also available from a variety of chemical reactions other than combustion. For example,the energy produced by the batteries in a cell phone, car, or flashlight results from chemical reactions .

by this exothermic reaction heats and then melts the metal being cut. The sparks are tiny bits of the molten metal flying away. (b) A cold pack uses an endothermic process to create the sensation of cold. (credit a: modification of work by “Skatebiker”/Wikimedia commons)

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