VSPER / shapes of molecules

Question 1

shapes of molecules depend on the electron regions around the central atom. but what specific qualities of electron regions? (2)

Answer 1

1. bonding regions
2. lone pairs

Question 2

give the ideal (w/o lone pairs) bond angles for:
- linear
- trigonal planar
- tetrahedral
- trigonal bipyramid
- octaherdal

Answer 2

1. 180°
2. 120°
3. 109,5°
4. 90° or 120°
5. 90°

Question 3

give the distorted (w/ lone pairs) bond angles for:
1. bent
2. trigonal pyramidal

Answer 3

1. 118°
2. 107°

Question 4

what is the bond angle of:
- water (H20)
- ammonia (NH3)

Answer 4

• 104,5 ° (bent)
• 107 ° (trigonal pyramidal)