Intramolecular forces

Question 1

intremolecular forces

Answer 1

• electrostatic attractions between molecules

- are significantly weaker than covalent bonds (which are weaker than ionic bonds)

Question 2

london dispersion forces

Answer 2

• the weakest interactions
• are present in all atoms and molecules
• as the size of the atom or structure increases, the corresponding london dispersion force increases

Question 3

Dipole dipole interactions

Answer 3

• occur between the oppositely charged ends of polar molecule
• are stronger than london forces
• these interactions are evident for solid and liquid phases
• negligible in the gas phase due to distant between particles

Question 4

hydrogen bonds

Answer 4

• specialized subset of dipole dipole interactions involved in intra and intermolecular attraction
• this type of bonding occurs when hydrogen is bonded to one of three very electronegative atoms (Fluorine, oxygen or nitrogen)

Question 5

For what value of DeltaEN will a non polar covalent bond form?

Answer 5

0 - 0.5

Question 6

For what value of DeltaEN will a polar covalent bond form?

Answer 6

0.5 - 1.7

Question 7

For what value of DeltaEN will a ionic bond form?

Answer 7

1.7 or higher

Question 8

rank the major intermolecular forces from strongest to weakest

Answer 8

Hydrogen bonding > dipole - dipole interactions > dispersion (London) forces

Question 9

describe what occurs during dipole - dipole interactions

Answer 9

A dipole consist of a segment of a molecule with partial positive and partial negative regions. The positive end of one molecule is attracted to the negative end of another molecule, and vice - versa

Question 10

in order to exhibit hydrogen bonding, what must be true of a given molecule

Answer 10

To experience hydrogen bonding, a molecule must contain a hydrogen bonded to a very electronegative atom (nitrogen, oxygen or fluorine)

Question 11

formal charge equation

Answer 11

= V - N(nonbonding) - 1/2N(nonbonding