Intermolecular forces: Review

Main intermolecular forces

Water soluble compound (more complex)

Water soluble compound (biomolecule)

Boiling point

freezing point

vitamin B-12









































Intermolecular forces: Review

Pauling        Dipole-dipole

Dipole-dipole

 H-Bonding NOF        H-bonding

H-bonding

London       London gif

London dispersion


























Identify the main intermolecular force in each of the following compound

Compound

dipole-dipole

H-bonding

London dispersion forces

a)

CH3 – F

b)

CH3 – CH3

c)

CH3 – NH2

d)

H – O – H

e)

CH3 – O – CH3

f)

H – C ≡ N


























Identify the main intermolecular force in each of the following compound

Compound

dipole-dipole

H-bonding

London dispersion forces

a)

CH3 – F

b)

CH3 – CH3

c)

CH3 – NH2

d)

H – O – H

e)

CH3 – O – CH3

f)

H – C ≡ N


























Identify the water soluble compound(s): more complex


O = C = O

(a)

S = C = O

(b)

H – N = CH – NH2

(c)

O = S = O

(d)

SiCl4

(e)

H – I

(f)


























Identify the water soluble compound(s): more complex


O = C = O

oil / fat soluble

S = C = O

water soluble (dipole)

H – N = C – NH2

water soluble (H-bonding)

O = S = O

water soluble (bent - dipole)

SiCl4

oil / fat soluble (London)

H – I

water soluble (acid)


























Identify the water soluble compound(s): Biomolecules


Vitamin-A caffeine vitamin-C

A

B

C


























Identify the water soluble compound(s): Biomolecules


Vitamin-A caffeine vitamin-C

Vitamin-A: not soluble

Caffeine
partially soluble: 2 g/100 mL

Vitamin-C: water soluble


























Which compound has the highest boiling point


propane dimethyl ether ethanol

A (44.1 g/mol)

B (46.1 g/mol)

C (46.1 g/mol)


























Which compound has the highest boiling point


propane dimethyl ether ethanol

propane Tb = -42 °C

dimethyl ether Tb = -23 °C

ethanol Tb = 78.5 °C


























Select the substance with the highest melting point


propane dimethyl ether

31 g/mol

34 g/mol


























Select the substance with the highest melting point


propane dimethyl ether

Tf = −138 °C

Tf = −93 °C

Note: Freezing point and melting point have the same value.


























Is Vitamin-B12 water soluble?

vitamin-B12


























Is Vitamin-B12 water soluble?

vitamin-B12


























Is Vitamin-B12 water soluble?

vitamin-B12

YES! (H-bonding)