Thermochemistry Lecture 4 May 9th, 2024

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Last updated 8:45 PM on 5/13/24
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7 Terms

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Enthalpy

The sum of the internal energy of a system and the product of its pressure and volume:H = U + PV

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Qp

Heat transferred at constant pressure conditions, calculated as delta rH = q + w - w = Qp

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Endothermic Reactions

Chemical reactions that absorb heat from surroundings at constant pressure (delta rH > 0)

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Exothermic Reactions

Chemical reactions that release heat to surroundings at constant pressure (delta rH < 0)

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Coffee-cup Calorimeter

Device used to measure temperature changes due to reactions at constant pressure conditions, particularly suited for reactions in solutions

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Hess’ Law

States that the delta rH for an overall reaction is the sum of delta rH’s of the individual steps in the reaction sequence

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Standard Enthalpies of Formation

Tables used to predict the results of new reactions based on the results of others' measurements