Thermodynamics Flashcards
1
Q
first law of thermodynamics
A
energy cannot be created or destroyed - only converted
2
Q
second law of thermodynamics
A
for a reaction to be spontaneous their must be an increase in entropy from reactants to products
3
Q
define Gibbs free energy
A
energy available to a compound
4
Q
features of a reaction with -ve delta G
A
- thermodynamically favourable, likely to be feasible, energy released to surroundings
5
Q
features of a reaction with +ve delta G
A
- thermodynamically unfavourable, unlikely to be spontaneous,
- energy impute required,
- likely to be part of a coupled reaction
6
Q
exergonic reaction
A
has a negative delta G
7
Q
endergonic reactions
A
has a positive delta G
8
Q
delta G naught prime
A
- Delta G of a reaction under normal physiological parameters
e. g. pH 7, temp 37 degrees
9
Q
features of a reaction with delta G of 0
A
- reaction is at equilibrium
10
Q
Features of coupling endergonic biochemical processes
A
- allows thermodynamically unfavourable reactions to occur
11
Q
metabolism reaction equation
A
metabolism = anabolism + catabolism
12
Q
anabolism
A
- synthesis of new compounds
- reduction reaction + endergonic
13
Q
catabolism
A
- degradation of compounds
- oxidation and exergonic
14
Q
delta g calculations
A
ΔG = (products ΔG) - (reactants ΔG) ΔG = ΔH - TΔS ΔG = ΔG°' + RTLnK(eq) ΔG°' = -RTLnK(eq)
