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Thermochemistry and Thermodynamics
Part of the Chemistry Review
13
Chemistry
Undergraduate 4
01/05/2017

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Term
thermochemical data
Definition
the amount of heat (energy) transferred to or from a reaction

this is equal to the enthalpy change (ΔH) of a reaction
Term
endothermic
Definition
ΔH is positive, heat is added to the reaction
Term
exothermic
Definition
ΔH is negative, heat is released by the reaction
Term
Hess's law
Definition
the statement that the enthalpy changes for reactions are additive
Term
equation for Hess's law
Definition
ΔHrxn = ΣνprodΔH°f(prod) – ΣνreactΔH°f(react) I think ν = stoichiometric coeffecients
Term
Hess's law for gases
Definition
ΔHrxn(gas) = (bonds broken) – (bonds formed)
Term
Gibbs free energy change (ΔG)
Definition
a measure of spontaneity for a reaction
Term
the equation for Gibbs free energy change (ΔG)
Definition
ΔG = ΔH – TΔS
Term
when ΔG = +, the rxn spontaneity of the rxn is...
Definition
non-spontaneous in forward direction

I think this means spontaneous in reverse direction
Term
when ΔG = -, the rxn spontaneity of the rxn is...
Definition
spontaneous in forward direction
Term
when ΔG = 0, the rxn spontaneity of the rxn is...
Definition
equilibrium (neither forward nor reverse reaction)
Term
thermodynamics of equilibrium
Definition
relationship between ΔG and Q and K
Term
equation for the thermodynamics of equilibrium
Definition
"ΔG = ΔG° + RTlnQ" where "ΔG° = –RTlnK"
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