Thermochemistry - Enthalpy Flashcards
1
Q
Pressure-volume (PV) work
A
a volume change under constant pressure
2
Q
PV work
A
w = -P/\V
3
Q
what does P stand for in PV work
A
external opposing pressure
4
Q
what does /\V stand for in PV work
A
change in the volume of the container
5
Q
when a change occurs at constant volume…
A
/\V = 0 and no work is done
6
Q
enthalpy equation
A
H = U + PV
7
Q
enthalpy of reaction
A
the difference between the enthalpies of the products and the enthalpies of the reactants
8
Q
enthalpy of reaction formula
A
/\H = H(products) - H(reactants)
9
Q
when /\H > 0
A
endothermic process
10
Q
when /\H < 0
A
exothermic process
11
Q
enthalpy is a ____ property, which means…
A
extensive; properties are dependent on the amount of matter involved
