Chapter 5

Question 1

What are the 2 major problems with Lewis theory? How are these solved?

Answer 1

It cannot accurately predict the 3D
shapes of molecules (Solved by VSEPR theory)
It does not account for the role of orbitals
in covalent bonding
(Solved by
Hybrid Orbital
theory and
MO theory)

Question 2

Are electron pairs attracted to or repelled by each other?

Answer 2

Repelled

Question 3

How do we predict the shape of a molecule?

Answer 3

Assume valence electrons are as far apart as possible

Question 4

What are e- pairs also called?

Answer 4

e- domains

Question 5

How many e- pairs do double and triple bonds count as?

Answer 5

1

Question 6

What does e- domain geometry correspond to?

Answer 6

of e- domains in a lewis structure

Question 7

What does molecular geometry refer to?

Answer 7

Position of atoms only, not bonding pairs

Question 8

How do you tell the difference between trigonal planar and bent molecular geometry?

Answer 8

Bent has 1 lone pair, TP has all e- domains bonding

Question 9

TP bond angle

Answer 9

120

Question 10

Are nonbonding or bonding pairs larger?

Answer 10

Nonbonding

Question 11

How does having bonding electrons affect the charge of the central atom?

Answer 11

Bonding electrons are shared by two
atoms, so some of the negative charge
is removed from the central atom.

Question 12

How does having nonbonding electrons affect negative charge?

Answer 12

They’re localized
on the central atom, so the area of
negative charge takes more space.

Question 13

3 Electron domains

Answer 13

Trigonal planar

Question 14

4 Electron domains

Answer 14

Tetrahedral

Question 15

5 Electron domains

Answer 15

Trigonal bipyramidal

Question 16

6 Electron domains

Answer 16

Octahedral

Question 17

1 or 2 Electron domains

Answer 17

Linear molecular geometry

Question 18

2 bonding domains, 0 nonbonding

Answer 18

Linear molecular geometry

Question 19

3bonding domains, 0 nonbonding

Answer 19

Trigonal planar molecular geometry

Question 20

2 bonding domains, 1 nonbonding domain

Answer 20

Bent molecular geometry

Question 21

Bond angle for trigonal planar

Answer 21

120

Question 22

What do double and triple bonds do for electron density?

Answer 22

Make greater e- density on that side of the atom, affecting bond angles

Question 23

Do more electrons in a set of bonds increase or decrease e- angles?

Answer 23

Increase

Question 24

4 bonding domains, 0 nonbonding

Answer 24

Tetrahedral

Question 25

3 bonding domains, 1 nonbonding domain

Answer 25

Trigonal pyramidal

Question 26

2 bonding domains, 2 nonbonding domains

Answer 26

Bent

Question 27

Tetrahedral bond angle

Answer 27

109.5

Question 28

5 bonding domains, 0 nonbonding

Answer 28

Trigonal bipyramidal

Question 29

4 bonding domains, 1 nonbonding domains

Answer 29

Seesaw (Lone pair makes it look like stick figure on its side with balloon head with atoms as arms and legs)

Question 30

3 bonding domains, 2 nonbonding domains

Answer 30

T shaped (balloon man with 2 heads, 2 arms, and one leg on its side)

Question 31

2 bonding domains, 3 nonbonding domains

Answer 31

Linear (balloon man with 2 heads and abdomen, 2 arms as atoms on its side)

Question 32

Trigonal bipyramidal angles

Answer 32

90 and 120

Question 33

6 bonding pairs, 0 nonbonding pairs

Answer 33

Octahedral

Question 34

5 bonding domains, 1 nonbonding domains

Answer 34

Square pyramidal

Question 35

4 bonding domains, 2 nonbonding domains

Answer 35

Square planar

Question 36

Octahedral bonding angle

Answer 36

90

Question 37

START ON SLIDE 20

Question 38

Paramagnetic means it has

Answer 38

Unpaired electrons

Question 39

Diamagnetic means it has

Answer 39

all e- paired