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UI CHEM 1110 - Thermochemisty
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CHEM 1110 1st EditionLecture 11Outline of Last Lecture I. The Nature of Energy II. The 1st Law of ThermodynamicsIII. EnthalpyIV. Enthalpies of ReactionOutline of Current Lecture I. The 1st law of Thermodynamics II. Enthalpy III. Enthalpies of reactionCurrent LectureI. The 1st Law of Thermodynamics A. State Functions: a property of a system that depends only on its current states and not on the manner in which the state was achieved 1. Temperature, volume, pressure, internal energy 2. Heat and work are not state functions B. PV Work- Gas Expansion and Contraction 1. w= -P∆V2. SI Units of P∆Va. Force- Newton (1N)b. Pressure- Pascal (1 Pa) II. Enthalpy These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.A. Enthalpy, H = heat in processes occurring at constant pressure when the only work is PV work 1. Is an extensive property 2. H is a state function that can’t be measured directly a. H= E + PVi. ∆H= ∆E + P∆V [where ∆E= q+w and w=-P∆V]ii. ∆H= q + w – w = qIII. Enthalpies of Reaction A. ∆H = Hfinal/products – Hinitial/reactants B. Endothermic- heat required (from surroundings to system)1. Ex: Melting ice C. Exothermic – heat released (from system to surroundings)1. Ex: Combustion of


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