# Shared Flashcard Set

## Details

Week 1 Guide
N/A
38
Biochemistry
12/10/2011

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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