Shapes Of Molecules

Question 1

What is a charge cloud

Answer 1

An area or space where electrons are whizzing around

Question 2

What is a lone pair

Answer 2

A pair of electrons that are non bonding

Question 3

What are the repulsion rules between bonding and lone pairs

Answer 3

Lone pairs have greater repulsion than bonding pairs
2 lone pairs repulsion is greater than a lone pair -bond pair repulsion which is greater than a bond pair -bond pair repulsion

Question 4

What shape and bond angle does 2 bonding pairs make

Answer 4

Linear shape
Bond angle 180

Question 5

What shape and bond angle does 3 bonding pairs make

Answer 5

Trigonal planar
120

Question 6

What shape and bond angle does 4 bonding pairs make

Answer 6

Tetrahedral
109.5

Question 7

What shape and bond angle does 5 bonding pairs make

Answer 7

Trigonal bipyramidal
90 and 120

Question 8

What shape and bond angle does 6 bonding pairs make

Answer 8

Octahedral
90

Question 9

What shape and bond angle does 3 bonding pairs and 1 lone pair make

Answer 9

Trigonal Pyramidal
107

Question 10

What shape and bond angle does 2 bonding pairs and 2 lone pairs make

Answer 10

Bent /V-shaped
104.5

Question 11

What shape and bond angle does 3bonding pairs and 2 lone pairs make

Answer 11

Trigonal planar
120
The 2 lone pairs revoke equally from opposite side

Question 12

What shape and bond angle does 4 bonding pairs and 2 lone pairs make

Answer 12

Square planar
109.5
The 2 lone repel equally from opposite sides

Question 13

What are the rules to find the shapes of molecules e.g NH3

Answer 13

1)count the no of electrons in
the outer shell of the central
Atom. 5
2)Add number of electrons that the
bonding atom brings. 5+(1X3)= 8
3)add/remove electrons for ions if present
4)divide the number by 2 to give the
number of electron pairs. 8/2 =4
5)look at the molecule to find how
many lone and bonding pairs