Thermochemistry Chapter 6.

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Presentation transcript:

Thermochemistry Chapter 6

Vocabulary Energy Law of conservation of energy Potential energy Kinetic energy Heat (q) Work (w) Pathway State function System Capacity (C) Specific heat capacity Molar heat capacity Constant-pressure calorimetry Surroundings Exothermic Endothermic Thermodynamics First law of thermodynamics Internal energy (E) Enthalpy (H) Calorimeter Calorimetry Constant volume Hess’s law Standard enthalpy of formation Standard state

6.1 The Nature of Energy Temperature vs. Heat: Temperature reflects the random motions of the particles in a particular substance Heat involves the transfer of energy between two objects due to a temperature difference Ways to transfer energy: Work Heat When energy is transferred, the total energy transferred is constant; however, the amount of heat and work involved depend upon the pathway. A change in a state function is independent of the pathway Energy is a state function Work and heat are NOT state functions

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