Chapter 9

Question 1

Molecular Geometry

Answer 1

3-D arrangement of atoms in a molecule

Question 2

AX2

Answer 2

Linear

180

Question 3

AX3

Answer 3

Trigonal Planar

120

Question 4

AX4

Answer 4

Tetrahedral

109.5

Question 5

AX5

Answer 5

Trigonal Bipyramidal

90, 120, 180

Question 6

AX6

Answer 6

Octahedron

90, 180

Question 7

VSEPR Theory Meaning

Answer 7

Valence Shell Electron Pair Repulsion Theory

Question 8

VSEPR Theory

Answer 8

Valence electron pairs in a molecule repel each other, and so try to position themselves as far as possible away from each other

Question 9

What is the molecular geometry controlled by?

Answer 9

Repulsion between electron pairs

Question 10

Rules in VSEPR Model

Answer 10

When counting electron pairs around the central atom, lone pairs, double and triple bonds are all treated just like single bonds
If a molecules has more than one resonance structure, then the VSEPR model can be applied to any one of them

Question 11

Order of Repulsion Energies

Answer 11

LP/LP > LP/BP > BP/BP

Lone pairs are bigger and push the bond angles of the structures

Question 12

AX2E

Answer 12

Bent

Question 13

AX3E

Answer 13

Trigonal Pyramidal

Question 14

AX2E2

Answer 14

Bent

Question 15

AX4E

Answer 15

Seesaw

Question 16

AX3E2

Answer 16

T-Shaped

Question 17

AX2E3

Answer 17

Linear

180

Question 18

AX5E

Answer 18

Square Pyramidal

Question 19

AX4E2

Answer 19

Square Planar

Question 20

Dipole

Answer 20

The electron density is pulled more towards the more electronegative atom