C5 - Thermochemistry (Gen. Chem 1)

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8 Terms

1

exothermic

heat transfers out of the system

2

endothermic

heat transfers into the system

3

state functions

property dependent upon a state, rather than an intrinsic property

4

enthalpy

total heat content of a system

  • H = U + PV

5

enthalpy of rxn

energy required for / released by a reaction

  • ∆Hrxn = Hproducts - Hreactants

6

calorimeter constant

Ccal = -qrxn/∆T

7

Hess’s law

total enthalpy in a string of reactions is the sum of each step’s enthalpy change

8

standard enthalpy of formation (∆Hº)

enthalpy associated w/ substance formation in their standard state