shapes of molecules

Question 1

What is VSEPR Theory?

Answer 1

Lone pairs and bonding pairs around the central atom arrange themselves in such a way that repulsion forces are least between them.

Question 2

What is the order of the force of repulsion between specific bonds?

Answer 2

lone pair - loan pair ( highest)
lone pair- bond pair (2nd highest)
bond pair - bond pair ( 3rd highest)

Question 3

What are some facts about shapes of molecules?

Answer 3

1) shape is always determined around central atom
2) a molecule should have at least two bonds for angle
3) The double and triple bonds are always considered as one bonding pair

Question 4

What is the shape of AB2 molecule with 2 bp and no lp ?

Answer 4

Linear planar ( 180°) 16e

Question 5

What is the shape of AB3 molecule with 3 bp and no lp?

Answer 5

Trigonal planar (120°) 24e

Question 6

What is the shape of AB3 molecule with 2bp and 1lp?

Answer 6

Bent planar (less than 120°) 18e

Question 7

What is the shape of the AB4 molecule with 4 bp and no lp?

Answer 7

Tetrahedral (109.5°) 32e

Question 8

What is the shape of AB4 molecule with 3bp and 1 lp?

Answer 8

Trigonal Pyramidal (non planar)( 107°) 26e

Question 9

What is the shape of AB4 molecule with 2bp and 2lp?

Answer 9

bent (planar) (104.5°) 20e

Question 10

What is the shape of AB5 molecule with 5bp?

Answer 10

Trigonal bipyramidal (equator= 120°) (axial=90°) 40e

Question 11

What is the shape of AB6 molecule with 6bp and no lp?

Answer 11

octahedral (90°) 48e

Question 12

What is the shape of AB6 molecule with 4bp and 2 lp ?

Answer 12

Square planar (90°) 36e