Complex Shapes of Molecules

Question 1

What effect does a lone pair have on bond angles?

Answer 1

Decreases bond angle by 2.5

Question 2

Order electron repulsion from strongest to weakest

Answer 2

lone pair - lone pair

lone pair - bonding pair

bonding pair - bonding pair

Question 3

why do lone pairs have a greater repulsion than bonding pairs?

Answer 3

the lone pairs are closer to the nucleus of the central atom, so their repulsion is greater

Question 4

describe a molecule with 2 bonding pairs and 1 lone pair

Answer 4

the shape is bent and bond angle is 117.5

Question 5

describe a molecule with 3 bonding pairs and 1 lone pair

Answer 5

the shape is trigonal pyramidal and bond angle is 107

Question 6

describe a molecule with 2 lone and 2 bonding pairs

Answer 6

the shape is bent and the bond angle 104.5

Question 7

describe a molecule with 4 bonding pairs and 1 lone pair

Answer 7

the shape is seesaw and the bond angle is 89 and 119

Question 8

describe a molecule with 3 bonding pairs and 2 lone pairs

Answer 8

the shape is T-shape and the bond angle is 89

Question 9

describe a molecule with 5 bonding pairs and 1 lone pair

Answer 9

the shape is square pyramidal and the bond angle is 89

Question 10

describe a molecule with 4 bonding pairs and 2 lone pairs

Answer 10

the shape is square planar and the bond angle is 90

Question 11

why does the bond angle of a square planar molecule not change from the octahedral bond angle, despite 2 lone pairs replacing 2 bonding pairs

Answer 11

each lone pair is at the end of the molecule, so their repulsion on the bonding pairs are balanced out, resulting in no net change in bond angle