Chapter 2: Water Flashcards
When is water most dense?
In its liquid state
Which atom is the acceptor in an H bond?
The more electronegative atom (bonded to H atoms)
Which atom is the donor in an H bond>
the H atom covalently bonded to another electronegative atom
Which atoms cannot form H bonds?
H atoms covalently bonded to C atoms
Dissociation energy of H bonds
~20 Kj/mol
Strength of H bonds depend on angle and distance between atoms, the strongest bonds are:
Linear and closer
The intermolecular bonds between bases in DNA are
H bonds
How to tell if a molecule dissolves in water?
polar, surrounded by OH’s, O’s, and NH’s
How to tell if a molecule is amphipathic?
has carbon groups and OH’s/ O’s/ NH’s
How to tell if a molecule will not dissolve in water?
Lack of dissolvable groups along w large carbon chains
How does water dissolve a compound?
surrounds the molecule and forms H bonds around it
How does water interact w a nonpolar molecule
surrounds the compound and creates one large clump to reduce surface are (does not form H bonds)
Energy of Hydrophobic interactions
~9 kj/mol
Hydrophobic reactions are unique to
water
one of the main factors behind protein folding
hydrophobic interactions
