CHEM 105 Chapter 5 Quiz 2

Question 1

VSEPR Theory

Answer 1

electron groups around the central atom will be most stable when they are as far apart as possible; the resulting geometric arrangement will allow us to predict the shapes and bond angles in the molecule

Question 2

electron groups

Answer 2

each lone pair of electrons = one electron group on a central atom
each bond = one electron group on a central atom, regardless of whether it is single, double, or triple

Question 3

two electron groups on the central atom

Answer 3

linear, 180*

Question 4

three electron groups on the central atom

Answer 4

trigonal planar, 120*

Question 5

four electron groups on the central atom

Answer 5

tetrahedral, 109.5*

Question 6

five electron groups on the central atom

Answer 6

trigonal bipyramidal, 90* and 120*

Question 7

six electron groups on the central atom

Answer 7

octahedral, 90*

Question 8

for a molecule to be polar, it must have

Answer 8

• polar bonds (EN difference, measured bond dipole moments)

- an unsymmetrical shape

Question 9

2 electron groups, 0 lone pairs

Answer 9

linear, 180*

Question 10

3 electron groups, 0 lone pairs

Answer 10

trigonal planar, 120*

Question 11

3 electron groups, 1 lone pair

Answer 11

bent, <120*

Question 12

4 electron groups, 0 lone pairs

Answer 12

tetrahedral, 109.5*

Question 13

4 electron groups, 1 lone pair

Answer 13

trigonal pyramidal, <109.5*

Question 14

4 electron groups, 2 lone pairs

Answer 14

bent, <109.5*

Question 15

5 electron groups, 0 lone pairs

Answer 15

trigonal bipyramidal, 120* equatorial and 90* axial

Question 16

5 electron groups, 1 lone pair

Answer 16

seesaw, <120* equatorial and <90* axial

Question 17

5 electron groups, 2 lone pairs

Answer 17

T-shaped, <90*

Question 18

5 electron groups, 3 lone pairs

Answer 18

linear, 180*

Question 19

6 electron groups, 0 lone pairs

Answer 19

octahedral, 90*

Question 20

6 electron groups, 1 lone pair

Answer 20

square pyramidal, <90*

Question 21

6 electron groups, 2 lone pairs

Answer 21

square planar, 90*