chapter 6 - Thermochemistry Energy is the capacity to do...

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Thermochemistry Energy is the capacity to do work or supply heat. System: refers to the substance or rxn mixture Surroundings: the container that hold the system and then everything outside the system Thermodynamic state in a macroscopic state that is defined by a set of state properties State properties are properties that are completely determined by the present state of the system (pressure, volume, temp, enthalpy, entropy, free energy) Thermodynamic process is a process that leads to the change in the thermodynamic state of a system ∆ = final – initial OR products-reactants ∆E =q+w (heat+work) Heat (q): the energy that is transferred as a result of a temperature difference between a system and its surroundings (from warmer to cooler) Higher temps have more vibration (in molecules) and this transfers from one body to another and eventually equilibrium will be achieved A rxn that releases heat to its surroundings is termed exothermic q=(-) A rxn that absorbs heat from its surrounds is termed endothermic q=(+) Joule, J is common energy value Calories or 1 cal = 4.184 J (cal we eat are kilocalories)
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This note was uploaded on 11/10/2010 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.

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chapter 6 - Thermochemistry Energy is the capacity to do...

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