Effect of lone pairs on shape of the molecule

Question 1

How does lone pairs affect the shape of molecules?

Answer 1

= lone pairs repel more than bonding pairs
= extra repulsion: decreases other bond angles by 2.5 degrees
= the lone pairs count as a bonding pair in the total

Question 2

If there is 3 bonding pairs and 1 lone pair what does the shape look like?

Answer 2

= tetrahedral with lone pairs on the top
= degree is 109.5-2.5= 107 degrees

Question 3

If there is 2 bonding pairs and 2 lone pairs what does the shape look like?

Answer 3

= non linear
= v shaped molecule

Question 3

If there is 2 bonding pairs and 2 lone pairs what does the shape look like?

Answer 3

= non linear
= v shaped molecule

Question 4

If there is 2 bonding pairs and 2 lone pairs what does the shape look like?

Answer 4

= non linear
= v shaped molecule