[Unit 3.6] | Shapes Of Molecules & Ions

Question 1

• What do electrons pairs do to one another?

Answer 1

• They repel each other. To counteract this, they move to areas of electron density that minimise repulsion.

Question 2

What is the name and bond angle(s) of a molecule with 2 areas of electron density?

Answer 2

• Linear
• 180°

Question 3

What is the name and bond angle(s) of a molecule with 3 areas of electron density?

Answer 3

• Trigonal
• 120°

Question 4

What is the name and bond angle(s) of a molecule with 4 areas of electron density?

Answer 4

• Tetrahedral
• 109.5°

Question 5

What is the name and bond angle(s) of a molecule with 5 areas of electron density?

Answer 5

• Trigonal Bipyramidal
• 90°, 120°

Question 6

What is the name and bond angle(s) of a molecule with 6 areas of electron density?

Answer 6

• Octahedral
• 90°

Question 7

What effect do lone pairs have on bond angles?

Answer 7

Each lone pair reduces the angles by 2.5°

Question 8

What is the name and bond angle(s) of a molecule with 4 areas of electron density and 1 lone pair?

Answer 8

• Trigonal Pyramidal
• 107°

Question 9

What is the name and bond angle(s) of a molecule with 4 areas of electron density and 2 lone pairs?

Answer 9

• V-Shaped
• 104.5°

Question 10

What is the name and bond angle(s) of a molecule with 5 areas of electron density and 1 lone pair?

Answer 10

• Seasaw
• 87.5°, 117.5°

Question 11

What is the name and bond angle(s) of a molecule with 5 areas of electron density and 2 lone pairs?

Answer 11

• T-Shaped
• 85, 115

Question 12

What is the name and bond angle(s) of a molecule with 6 areas of electron density and 1 lone pair?

Answer 12

• Square Pyramidal
• 87.5°

Question 13

What is the name and bond angle(s) of a molecule with 6 areas of electron density and 2 lone pairs?

Answer 13

• Square Planar
• 85°