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Chapter 10 Vocabulary: Thermochemistry

Calorie The quantity of heat raises the temperature of 1 g of pure water.
Calorimeter An apparatus for measuring heat changes.
Calorimetry The measurement of heat changes.
Chemical Potential Energy Energy stored within the structural units of units of chemical substances.
Energy The capacity for doing work; it exists in several forms, including chemical, nuclear, electrical, radiant, mechanical, and thermal energies.
Endothermic Process Heat absorbing process.
Exothermic Process A heating dissipating process.
Enthalpy The amount of heat that a substance has at a given temperature and pressure.
Heat The energy that is transferred from one body to another because of a temperature difference.
Heat Capacity The quantity of heat required to change an object's temperature by exactly 1 degree of C.
Heat of Combustion The heat absorbed or released during a chemical reaction in which one mole of a substance is completely burned.
Heat of Reaction The heat released or absorbed during a chemical reaction; equivalent to H, the change in enthalpy.
Hess's Law of Heat Summation In going from a particular set of reactants to a particular sec of products, the enthalpy change is the same whether the reaction takes place or in a series of steps.
Joule The SI unit of energy; 4.184 joules equal 1.000 calorie.
Law of Conservation of Energy Energy is neither created or destroyed in an ordinary chemical or physical process.
Molar Heat of Fusion The energy, in kilojoules, required to melt one mole of a solid.
Molar Heat of Vaporation The energy, in kilojoules, required to vaporize one mole of a liquid.
Specific Heat Capacity The amount of heat it takes to raise the temperature of 1g of the substance 1 degree C and is measured in J/(g x 6 degrees C)
Standard Heat of Formation The change in enthalpy (H) for a reaction in which one mole of a compound is formed from its constituent elements.
Surroundings The remainder of the universe that is outside the system.
System Any part of the universe that attention is focused on.
Thermochemical Equation A chemical equation that includes the amount of heat produced or absorbed during the reaction.
Thermochemistry The study of heat changes in chemical reactions.
Universe The totality of all existing things.
Created by: KellyBeck on 2009-01-09

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