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Chemical Thermodynamics by J. Rajaram

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Chapter 3

Thermochemistry

3.a.  Heat Changes in Chemical Reactions

Thermochemistry is the study of the measurement and interpretation of heat changes accompanying chemical and physical processes. Processes in which heat is evolved are called exothermic and those in which heat is absorbed are called endothermic. The heat changes accompanying a transformation depend on the path chosen, but if a process is carried out at constant pressure or at constant volume, the heat changes have definite values and are state functions. It is for this reason that the reactions are usually conducted at constant pressure or constant volume conditions. Such heat changes are measured by conducting the reaction in a calorimeter and noting the temperature change in ...

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