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chapter 17 vocab
final vocab
22
Chemistry
10th Grade
05/19/2009

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Term
thermochemistry
Definition
the study of energy changes that occur during chemical reactions and changes in state
Term
chemical potential energy
Definition
the energy stored in the chemical bonds of a substance
Term
heat
Definition
energy that transfers from one object to another because of a temp difference between them, represented by q
Term
system
Definition
the part of the universe on which you focus your attention
Term
surroundings
Definition
include everything else in the universe
Term
law of conservation of energy
Definition
in any chemical or physical process, energy is neither created nor destroyed
Term
endothermic process
Definition
one that absorbs heat from the surroundings
Term
exothermic process
Definition
one that releases heat to its surroundings
Term
specific heat
Definition
the amount of heat it takes to raise the temperature of 1 g of the substance 1C
Term
calorimetry
Definition
the precise measurement of the heat flow into or out of a system for chemical and physical processes
Term
calorimeter
Definition
the insulated device used to measure the absorption of release of heat in chemical or physical processes
Term
enthalpy
Definition
the heat content of a system at constant pressure is the same as the property called this
Term
heat of reaction
Definition
the enthalpy change for the chemical equation exactly as it is written
Term
thermochemical equation
Definition
a chemical equation that includes the enthalpy change
Term
heat of combustion
Definition
the heat of reaction for the complete burning of one mole of a substance
Term
molar heat of fusion
Definition
the heat absorbed by one mole of a solid substance as it melts to a liquid at a constant temp
Term
molar heat of solidification
Definition
the heat lost when one mole of a liquid solidifies at a constant temp
Term
molar heat of vaporization
Definition
the amount of heat necessary to vaporize one mole of a given liquid
Term
molar heat of condensation
Definition
the amount of heat released when 1 mol of vapor condenses at the normal boiling point
Term
molar heat of solution
Definition
the enthalpy change caused by dissolution of one mole of substance
Term
Hess's law of heat summation
Definition
if you add 2 or more thermochemical equations to give a final equation, then you can also add the heats of reaction to give the final heat of reaction
Term
standard heat of formation
Definition
the change on enthalpy that accompanies the formation of one mole of a compound from its elements with all substances in their standard states at 25*C and 101.3 kPa
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