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Biochem thermo
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Enthalpy and units
tendency toward lowest energy state
j/mol or cal/mol
Entropy and units
tendency to maximize randomness
j/k
calories to joules
1 cal=4.18 j
what does a postitive delta H signify
rxn takes up heat
what does a postitive delta S signify
rxn becomes less ordered
what does a postitive delta G signify
rxn is unfavorable
1st law of thermodynamics
the total energy of a system remains constant
energy cannot be created or destroyed
2nd law of thermondynamics
in all spontaneous processes total entropy of the universe increases
thermo equation
G=H-TS
ΔG
0
standard free energy change
reactants and products at 1 M or 1 atm
T=298 K
ΔG
'
o
biochemist convention
rxn pH 7
[H+]=10^-7
equation with ΔG0 and ΔG'0
ΔG0=ΔG'0 + RTln [products]/[reactants]
relationship of Keq and ΔG'0 at equilibrium
ΔG'0=-RTlnKeq
difference between kinetics and thermodynamics
thermo-where is the eq. pointing
kinetics-how fast is the equilibrium approached
high energy compounds
large ΔG'0
ex
: ATP(bond strain), PEP(Product stabilized by isomerization), Phospocreatin (product resonance stabilized), Acyl Phosphates (product ionization stabilized)
release of Pi is favorable
bond stability between thiol ester and oxoesters
thiol ester less stable than oxoester because of poor overlap between 3p e- orbital of sulfur and sp orbital of carbon
more -ΔG'0 vs less- ΔG'0 in phosporylation
more - compounds can phosphorylate while less neg can be phosphorylated
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Author
Sheilaj
ID
336014
Card Set
Biochem thermo
Description
Stuff bro
Updated
2017-11-15T03:11:39Z
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