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Chemistry 1150 chapter 6
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Thermodynamics is the study of
heat and its
transformations
Thermochemistry is a branch of thermodynamics that deals with
the heat involved with chemical and
physical changes.
When energy is transferred from one object to another, it appears as
work (w) and/or as heat (q).
1 J (Joule)
= 1 kg*m2/s2
1 calorie (cal)=J
4.184J
1 Calorie (Cal)= c
1 kilocalorie
Delta Euniverse
Delta Esystem + Delta Esurroundings
Delta E
Efinal - Einitial = Eproducts - Ereactants
∆E = First Major Equation
q + w (heat +work)?
PV work
Pressure -Volume Work
•PV work:
created because of
volume change against an external pressure
Work = External Pressure x Change in
Volume
w = ─PDV
SOME IMPORTANT TYPES OF ENTHALPY CHANGE
C4H10(l) + 13/2O2(g) ----------------> 4CO2(g) + 5H2O(g)
heat of combustion (DHcomb)
SOME IMPORTANT TYPES OF ENTHALPY CHANGE
NaCl(s)------->NaCl(l)
heat of fusion (DHfus)
SOME IMPORTANT TYPES OF ENTHALPYCHANGE
C6H6(l)---------->C6H6(g)
heat of vaporization (DHvap)
SOME IMPORTANT TYPES OF ENTHALPY CHANGE
K(s) + 1/2Br2(l)--------> KBr(s)
heat of formation (DHf)
Second Major Equation
Heat Equation q = mass x cs x ∆T (Always
TF – TI!)
q = mass x cs x ∆T (Always TF – TI!)
AMOUNT (mol) of compound A
molar ratio from balanced equation
goes to
AMOUNT (mol) of compound B
AMOUNT (mol) of compound B goes to
DHrxn (kJ/mol)
HEAT (kJ) gained or lost
Third Major Equation
I don't get what its suppose to be exactly
since DE = q + w, we can determine DE (System) by...
measuring q and w
What do q and w stand for?
q -The heat transferred into/out of the system
w-The work done by/on the system.
A state function
Change in altitude depends only on the difference between the initial and final values, not on the path taken.
Hess's Law
The change in enthalpy for a stepwise process is the sum of the enthalpy changes of the steps. (Add up the changes for your total answer)
Fourth Major Equation!
DH0rxn = S mDH0f(products)- S nDH0f(reactants)
??? Study this outside the cards I don't get it, I think it has something to do with hess's law
Author
zzto
ID
135973
Card Set
Chemistry 1150 chapter 6
Description
Chemistry 1150 chapter 6 flashcards of important facts from power point slides.
Updated
2012-02-18T03:54:38Z
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