Properties of Biological Molecules

Question 1

Non-covalent bond

Answer 1

Electrostatic - Positive attracting negative
Hydrogen Bonds - Basically same only with hydrogen
Van Der Waals - Electronic charge around atom fluctuates creating areas capable of bonding

Question 2

Cuolomb’s Law

Answer 2

E = kq1q2 / Dr

Question 3

Free energy change (Delta G)

Answer 3

Delta G = -RTlnK
Delta G = Delta G (rxn) + RTlnK
(Normal Delta G comes from Table of rxn’s using 1M of both reactants

Question 4

Mass Action (Le chatliers principle)

Answer 4

Drive a reaction by increasing the concentration of the reactants or decreasing the concentration of the product.

Question 5

Oxidation-Reduction Reactions (ReDox)

Answer 5

Electron donor (i.e. reducing agent) will reduce (or be oxidized by) the electron receptor (i.e. oxidizing agent).

Question 6

Acid-Base Reactions

Answer 6

Weak acid dissociates in water, releasing proton and weak conjugate base
Weak base combines with protons in water, forming its conjugate acid

Question 7

pH = ????

Answer 7

-log [H+]

[H+] = molarity of solution

Question 8

Henderson-Hasselbalch Eq

Answer 8

pH = pKa + log([A-]/[HA])
pH = pKa + log (base/acid)

Question 9

Covalent Bond

Answer 9

Typical C-C Bond

1.54 A, 85 kcal/mol

Question 10

if pH > pKa then???

Answer 10

The substance will be deprotonated, meaning it will be basic