Shapes & Polarity (Test 2)

Question 1

Describe the properties of shapes & polarity

Answer 1

• COVALENT MOLECULAR ONLY
• Has VSPR (Valence Shell Electron Pair Repulsion) theory states that the electron pairs are arranged as far apart as possible.
• A lone pair has greater repulsion ability than a bonding pair.

Question 2

How many shapes are there & name them.

Answer 2

There are 5 shapes:

• Linear
• V-shape or Bent
• Trigonal Planar
• Pyramidal
• Tetrahedral

Question 3

Properties of linear

Answer 3

Molecules with only 2 areas of bonding pairs of electrons around the central atom will be linear.
E.g. O2, F2

Question 4

Properties of Trigonal Planar

Answer 4

3 pairs of electrons around the central atom.

E.g. BF3

Question 5

Properties of Pyramidal

Answer 5

4 pairs of electrons around the central atom BUT one pair is lone pair.
E.g. NH3

Question 6

Properties of Tetrahedral

Answer 6

4 bonding pairs of electrons around the central atom.

E.g. CH4

Question 7

Properties of V-shape or Bent

Answer 7

4 pairs of electrons around the central atom BUT 2 are lone pairs.
E.g. Water (H2O)