Bonding

Question 1

Rank the strength of the 3 IMFs (descending order)

Answer 1

1. H bonds (20-40kJ/mol)
2. Permanent dipole-dipole forces (10-20kJ/mol)
3. VdW forces (5-10kJ/mol)

Question 2

Outline what molecules H bonds exist in

Answer 2

Molecules with F-H, O-H or N-H bonds

Question 3

What is the angle in H-Bonds

Answer 3

180 degrees

Question 4

Why is there H bonding in H2O?

Answer 4

O2 is > electronegative > H+
Attraction between + dipole of H on 1 molecule & e- pair of O2 on other molecule

Question 5

Outline the molecules that have VdW forces

Answer 5

All molecules (only force in non-polar molecules)

Question 6

Outline how VdW forces arise

Answer 6

Temporary dipole (e- more on 1 side of molecule) causes induced dipole on other molecule (more e- = stronger VdW)

Question 7

Outline how Polar Bonds form

Answer 7

Polar molecules (one atom (-) > electronegative > other(+) ) attracts adjacent - dipole on molecule