Lecture 2 Flashcards
what makes a biomolecule informational
sequence. direction
unusual prop of water
high bp, mp, heat of vap, surface tension. bent polar structure. non tetrahedral bonds, h bond donor and acceptor
H bond potential per molecule
4 h bonds
water bond angle
104.3
dipole of water
positive toward H
arrangement of H bonds in ice
4 bonds / molecule. linear arrangement makes strong
h bond lifetime in ice
10 usec
arrangment of h bonds in water
2.3 h bond avarage / molecule. some non linear makes weaker
h bond lifetime in water
10 psec
water dielectric constant
high. means has ionization properties. acts as very good solvent
hydration shell
ions are always hydrated in water
water forms ___ with polar solutes
h bonds
water + nonpolar solutes
hydrophobic interaction. resists
orientation of water in hydration shell
depends on charge of ion
type of interaction between water and ion
dipole-charge interaction
lifetime of water molecule in Na+ hydration shell
2-4 nsec
a ___ solute organizes water. decrease/increase entropy
nonpolar. decrease in entropy
effect of nonpolar solutes aggregating on water structure.
decrease organization. increased entropy
amphiphilic
attracted to polar and nonpolar environments
amphipathic
molecules that contain both polar and nonpolar groups
fatty acids are amphiphilic/amphipathic. they behave in a amphiphilic/amphipathic manner
amphipathic. amphiphilic manner
equilibrium constant (Keq) for dissociation of water
([H+]{OH-])/(H20)
concentration of water
(1000 g/L)/ (18g/mol) = 55.5 M
name for unprotonated weak acid
conjugate base
