Shapes Of Molecules And Intermolecular Forces Ch. 7

Question 1

What happens to electron pairs in outer shells

Answer 1

They repel each other and end up as far apart as geometrically possible.

Question 2

Which are stronger lone or bond pairs

Answer 2

Lone pairs

Question 3

Rule for electron repulsion theory

Answer 3

Lone pair:lone pair repulsion > lone pair:bond pair repulsion> bond pair:bond pair repulsion

Question 4

Linear have a bond angle of

Answer 4

180°

Question 5

Trigonal planar have a bond angle of

Answer 5

120°

Question 6

Tetrahedral has a bond angle of

Answer 6

109.5°

Question 7

Pyramidal has a bond angle of

Answer 7

107°

Question 8

V-Shaped has a bond angle of

Answer 8

104.5°

Question 9

Two bond pairs, no lone pairs

Answer 9

Linear

Question 10

Three bond pairs, no lone pairs

Answer 10

Trigonal planar

Question 11

4 bond pairs, no lone pairs

Answer 11

Tetrahedral

Question 12

Three bond pairs, one lone pair

Answer 12

Pyramidal

Question 13

Two bond pairs, two lone pairs

Answer 13

V-Shaped

Question 14

What two criteria are there for a molecule to be polar

Answer 14

Polar covalent bonds, no symmetry

Question 15

Which shapes of molecules are described to be non-polar and why

Answer 15

Linear, trigonal planar, tetrahedral due to their symmetry

Question 16

What is intramolecular bonding

Answer 16

The forces within the molecule holding the atoms together

Question 17

What are intermolecular forces

Answer 17

Forces between molecules

Question 18

What are the three types of intermolecular forces from strongest to weakest

Answer 18

Hydrogen bonds, dipole dipole forces, van der Waals’ forces

Question 19

Define hydrogen bonding

Answer 19

special type of dipole dipole forces that only occurs between hydrogen and small, highly electronegative elements such as O, N and F.

Question 20

What is determined by the intermolecular forces

Answer 20

Boiling point (H-bonds = higher, van der Waals’ = Lower)