IIT-JEE · Chemistry

JEE Chemistry Notes – Chemical Thermodynamics, Enthalpy, Entropy and Gibbs Energy with Diagrams

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Class 11 Chemistry notes on Chemical Thermodynamics for JEE Main and JEE Advanced. Covers systems and state functions, work and heat, the first law, isothermal and adiabatic processes, enthalpy and heat capacities, Hess's law, bond enthalpy, entropy and the second law, Gibbs free energy and spontaneity, and the link with the equilibrium constant, with PV and energy diagrams, formula tables, solved examples and practice problems. Includes 5 labelled diagrams: Types of thermodynamic system; PV diagram: an adiabatic expansion curve falls more steeply than an isothermal one from the same point; Molar heat capacities of ideal gases, when vibration is ignored; Hess's law: the direct route equals the sum of the steps; ΔG against temperature for a reaction with positive ΔH and positive ΔS. It becomes spontaneous above T = ΔH/ΔS.