VSEPR

Question 1

linear

Answer 1

2 bonds - 180 degree

Question 2

trigonal planar

Answer 2

3 bonds - 120 degree

bent: 2 bonds 1 lone pair - 120 degree

Question 3

tetrahedral

Answer 3

4 bonds - 109
trigonal pyramidal: 3 bonds 1 lone pair (109 or slightly less)
bent: 2 bonds 2 lone pairs (109 or slightly less)

Question 4

trigonal bipyramidal

Answer 4

5 bonds - 90 and 120
see saw: 4 bonds 1 lone pair - 90, 120, 180
t shaped: 3 bonds 2 lone pairs - 90 and 180
linear : 2 bonds 3 lone pairs -180

Question 5

Octahedral

Answer 5

6 bonds- 90
square pyramidal: 5 bonds 1 lone pair 90 and 180
square planar: 4 bonds 2 lone pairs 90 and 180

Question 6

Why for tetrahedral the angle might be slightly less

Answer 6

lone pairs take up more space

Question 7

why are sigma and lone pairs considered molecular geometry

Answer 7

as VSEPR refers to the electron repulsion of atoms, only sigma and lone pairs around the central atom are considered structural pairs. Electrons in sigma and pi bonds do not repel each other because they are attracted by the same nuclei and the lone pairs around the central atom repeal each other resulting in a molecular geometry