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38
Biochemistry
Undergraduate 4
12/10/2011

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Term
What does the symbol U represent?
Definition
Energy.
Term
What does the symbol H represent?
Definition
Enthalpy
Term
What does the symbol G represent?
Definition
Free Energy
Term
What does the symbol S represent?
Definition
Entropy
Term
What does the symbol q represent?
Definition
heat absorbed by a system from the surroundings
Term
What does the symbol W represent?
Definition
work done by a system on the surroundings
Term
What are the units on H, q, U, W, and G?
Definition
kJ/mol or J/mol
Term
What are the units of entropy?
Definition
J/(mol K)
Term
What is the relation between U, q, and W?
Definition
ΔU=q-W
Term
What is the equation for S?
Definition
S=kAlnW where W is the number of energetically equivalent ways to arrange a system.
Term
How are G, T, and S related?
Definition
ΔG=ΔH-TΔS
Term
If a process is enthalpically favored but entropically unfavored, will the ΔG be more positive or more negative at a higher temperature?
Definition
ΔG will be more positive at a higher temperature.
Term
For a process making a favorable bonding interaction, what is the sign of ΔH?
Definition
Negative
Term
Does cooked spaghetti have more or less entropy than uncooked spaghetti?
Definition
More entropy
Term
At equilibrium what is the difference in free energy between products and reactants?
Definition
ΔG=0
Term
What does Keq represent?
Definition
The ratio of products to reactants at equilibrium.
Term
What does Q represent?
Definition
The ratio of products to reactants at any point in the reaction.
Term
How are ΔG and Q related?
Definition
ΔG=ΔGo+RTlnQ
Term
What is ΔG at equilibrium?
Definition
ΔGo=-RTlnKeq
Term
If Q is greater than K, at what direction will a reaction proceed?
Definition
To the left (towards reactants).
Term
How can you predict whether products or reactants will be higher in concentration at equilibrium?
Definition
If Keq<0, then more(higher concentration) reactants. If Keq>0, then more(higher concentration) products
Term
What is ΔGo?
Definition
The free energy change of a reaction when all of the reactions and products are in the standard state.
Term
What is ΔGo'?
Definition
Free energy change at biochemistry standard state. T=25oC, P=1 atm, A=1.
Term
Does a carboxylic acid group accept/donate a hydrogen bond?
Definition
Both.
Term
Draw out carboxylic acid and indicate which atoms accept and donate hydrogen bonds.
Definition
[image]
Term
Is a C-H bond hydrophobic or hydrophilic?
Definition
Hydrophobic
Term
Which atom in an O-H bond is positive?
Definition
Hydrogen
Term
Which atom in an O-H bond is negative?
Definition
Oxygen
Term
What does the term amphiphilic mean?
Definition
A molecule is both hydrophobic and hydrophilic.
Term
Hydrophobic Effect
Definition
Description of how hydrophobic molecules interact and release water from clathrate cages increasing the entropy of water.
Term
Which force contributes more to the interaction of hydrophobic molecules in
water: enthalpic attractions, or entropy?
Definition
Entropy
Term
Which force contributes more to the interaction of hydrophobic molecules in
water: enthalpic attractions, or entropy?
Definition
Entropy
Term
Bond strength of a covalent bond?
Definition
460 kJ/mol
Term
Bond strength of ionic interaction?
Definition
86 kJ/mol
Term
Bond strength of Hydrogen Bond?
Definition
20 kJ/mol
Term
Bond strength for Dipole-dipole Interactions
Definition
9.3 kJ/mol
Term
Bond strength of London Dispersion forces?
Definition
0.3 kJ/mol
Term
Does methane make stronger enthalpic reactions with water or benzene?
Definition
Water
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