7. Water Flashcards
1
Q
3 functions of water
A
- accounts for more than 70% of cell
- influenced shape and function of biomolecules
- acts as a medium for biochemical processes
2
Q
water is _____ and has what kind of bonds between O-H
A
water is polar
- has polar covalent bonds between O-H due to differences in electronegativity between O-H
3
Q
water molecules interact via _____ bonds
A
hydrogen bonds in a bent structure
4
Q
water is ___ dense when frozen and can form H bonds with as many as ___ neighbouring water molecules in ice
A
less dense
- 4 neighbouring molecules
5
Q
hydrogen bonding (2)
A
-5% of strength compared to C-C bonding
- formed between partly + and - atoms
6
Q
ionic interactions (2)
A
- 5-10% strength compared to C-C
- formed between oppositely charged ions
7
Q
van der waals interaction
A
- 0.4 to 4.0 kj/mol
- weak nonspecific force between two atoms
8
Q
hydrophobic interaction
A
- 2% of strength of C-C bond
- water is highly ordered around hydrophobic groups
9
Q
water as a good vs poor solvent
A
GOOD
- charged
- polar
- hydrophilic (AA, small alcohols)
POOR
- non polar
- hydrophobic (aliphatic chains)
10
Q
water is the universal solvent for ___ substances
A
ionic substances
