Ch 10 - Molecular Shape

Question 1

best lewis structure

Answer 1

minimal formal charge
negative charge on the most EN atom

Question 2

formal charge

Answer 2

box method

Question 3

bond order equation

Answer 3

bonding pairs/# atom pairs held together

Question 4

resonance structure

Answer 4

same placement of atoms, but different placement of bonding and nonbonding electrons

Question 5

exceptions to octet rule

Answer 5

electron deficient central atom: Be and B
odd electron molecules
expanded octet: period 3+

Question 6

electron geometry

Answer 6

linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral

Question 7

linear (2)

Answer 7

2 bonding
180

Question 8

trigonal planar

Answer 8

3 bonding
120

Question 9

bent (3)

Answer 9

2 bonding, 1 lone
< 120

Question 10

tetrahedral

Answer 10

4 bonding
109.5

Question 11

trigonal pyramidal

Answer 11

3 bonding, 1 lone
< 109.5

Question 12

bent (4)

Answer 12

2 bonding, 2 lone
«109.5

Question 13

trigonal bipyramidal

Answer 13

5 bonding
axial: 90
equatorial: 120
lone pairs go equatorial since longer bond angle decrease repulsions

Question 14

seesaw

Answer 14

4 bonding, 1 lone
axial: < 90
equatorial: < 120

Question 15

T shape

Answer 15

3 bonding, 2 lone
< 90

Question 16

linear (5)

Answer 16

2 bonding, 3 lone
180

Question 17

octahedral

Answer 17

6 bonding
90

Question 18

square pyramidal

Answer 18

5 bonding, 1 lone
< 90

Question 19

square planar

Answer 19

4 bonding 2 lone
90
lone pairs go opposite to decrease repulsions

Question 20

perspective drawing

Answer 20

wedge: towards
dash: away

Question 21

what happens with double and lone pairs in molecular shape

Answer 21

both squish other angles
double: electron dense, repulsion
lone: takes up more space