VSPER Theory - Unit 2

Question 1

What does VSEPR stand for?

Answer 1

Valence Shell Electron Pair Repulsion

Question 2

What is VSEPR theory based on?

Answer 2

The principle that negatively charged electrons pairs in the outer shells of an atom repel each other
As a result these electron pair are arranged as far away from each other as possible

Question 3

What occurs for a LINEAR shape?

Answer 3

When the central atom forms 2 covalent bonds and there are NO lone pairs of electrons on the central atom

Question 4

What occurs for a TRIAGONAL PLANAR shape?

Answer 4

When the central atom forms THREE covalent bonds and there are no lone pairs of electrons on the central atom

Question 5

What is the bond angle in a triagonal planar shape?

Answer 5

120 degrees

Question 6

What occurs for a TETRAHEDRAL shape?

Answer 6

when the central atom forms FOUR covalent bonds and there are no lone pairs of electrons on the central atom

Question 7

What is the bond angle in a tetrahedral shape?

Answer 7

109.5 degrees

Question 8

What shape does Water create?

Answer 8

A water molecule has two bond pairs, and two lone pairs of electrons surrounding the central oxygen atom, creating a bent shape

Question 9

What bond degree do BENT shape have?

Answer 9

104.5 degrees

Question 10

Summary - Number of Bonds per shape?

Answer 10

Bent = 2 bonds
Pyramidal = 3 bonds
Tetrahedral = 4 bonds
Triagonal Planar = 3 bonds
Linear = 2 bonds

Question 11

Summary - Number bond angle per shape?

Answer 11

Bent = 104.5
Pyramidal = 107
Tetrahedral = 109.5
Triagonal Planar = 120
Linear = 180

Question 12

Summary - Number of lone pairs?

Answer 12

Bent = 2
Pyramidal = 1
Tetrahedral = 0
Triagonal Planar = 0
Linear = 0