Package 4

Question 1

London Dispersion Force vs molecular size vs mass

Answer 1

Proportional

Question 2

Polarizability

Answer 2

How easily the electron distribution is distorted

Question 3

What is an alkane

Answer 3

Composed of hydrogen and carbon atoms when all the carbon atoms have only single bonds

Question 4

Polarity in alkanes

Answer 4

Non-polar since the electronegativity difference between carbon and hydrogen is so small

Question 5

Does straight or spherical isomers have a greater polarizability

Answer 5

Straight because it has a greater surface area and can make more connections with its neighbours

Question 6

Dipole induced dipole

Answer 6

Between a polar and non polar molecule
The dipole in the polar molecule creates a temporary dipole in the non polar molecule

Question 7

Dipole dipole

Answer 7

When two polar molecules opposite charged ends connect

Question 8

Hydrogen bonding

Answer 8

When H is covalently bonded with O, N, or F –> the bond is very polar
Creates a considerable partial positive charge on the hydrogen
H forms a strong electrostatic interaction with a lone pair

Question 9

Boiling points of group 14, 15, 16, and 17 hydrides

Answer 9

Much higher because they can form hydrogen bonds which make the molecules harder to remove

Question 10

Boiling and melting points of covalent bonds

Answer 10

Much lower than ionic because the intermolecular forces are weaker in covalent ones than the electrostatic attraction between ions in a crystal lattice
Therefore most covalent are gases or liquids at room temp