THERMOCHEM Flashcards
a chemical equation that includes the amount of energy, in the form of heat
Thermochemical Equation
reaction that gives off heat is called
Exothermic
A reaction that absorbs heat is called
Endothermic
if heat is given off by the system, the heat flow is
Negative Sign
The heat change or change in the heat content, in a chemical reaction is often referred to as the change in
Enthalpy
if heat is absorbed by the system, it is
Positive
The energy change in a chemical reaction is designated by
∆E
If a reaction is carried out at a constant volume, this would be the measured amount of ________.
Energy
reaction at constant pressure is equal to the change in enthalpy for the reaction
Heat of Reaction (∆Hr) or Heat of Formation (∆Hf)
for the formation of 1 mole of the compound from the elements, in the standard state.
∆Hf
The heat content of a free element, in the standard state, is taken as
Zero
the total amount of energy changed in a reaction which is ∆Hf at constant pressure, is equal to the difference between the ∆Hf of products and ∆Hf of reactants
total heat content of the products minus the total heat content of the reactants is equal in the
Heat of Reaction
the ∆H of reaction for the combination of two or more reactions is equal to the sum of the ∆Hf values for each individual reaction.
Hess’ Law
a compound is the amount of energy necessary to break the bonds in the compound and form atoms.
Bond Energies
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