Intermolecular Forces

Question 1

Chemical Bonds

Answer 1

• There are different bond types consisting of single, double and triple. Each bond has a specific number of electrons (single = 2) (double = 4)(triple = 6)
• Bond strength increases as the more bonds there are (single to triple)
• Bond length decreases the more bonds there are (single to triple)

Question 2

Linear

Answer 2

• 2 atoms attached to center atom (2 domains, both are bonding pairs)
• 0 unshared pairs (lone pairs)
• They push each other to opposite sides of the center
• Bond angle = 180o
• Example: BeF2

Question 3

Triangular Planar

Answer 3

• 3 atoms attached to center atom (3 domains, all are bonding pairs)
• 0 lone pairs
• They push each other apart equally
• Bond angle = 120o
• Example: BF3

Question 4

Tetrahedral

Answer 4

• 4 atoms attached to center atom
• 0 lone pairs
• Bond angle = 109.5o
• Example: CH4

Question 5

Pyramidal

Answer 5

• 3 atoms attached to centre atom
• 1 Ione pair
• Bond angle = <109.5° (107o)
• Example: NH3

Question 6

V-Shaped (Bent)

Answer 6

• 2 atoms attached to centre atom
• 2 lone pairs
• Bond angle = <109.5° (104.5o)
• Example: H2O