Chapter 2 - VESPR & Bonding

Question 1

Which atoms can satisfy octets with fewer than 8 electrons?

Answer 1

Carbon, boron, and berelliym

Question 2

What to look for to determine valid lewis structure

Answer 2

• Total electron count (check formal charges and see if sum on indv atoms adds to zero or not to determine e-)
• Violating octet rule

Question 3

VESPR Steric Number 2
(including degrees)

1) AX2
2) AXE

Answer 3

1) Linear
2) Linear

180 degrees

Question 4

VESPR Steric Number 3
(including degrees)

1) AX3
2) AX2E

Answer 4

1) Trigonal Planar
2) Bent

120 degrees

Question 5

VESPR Steric Number 4
(including degrees)

1) AX4
2) AX3E
3) AX2E2

Answer 5

1) Tetrahedral (109.7)
2) Trigonal pyrimdinal (106.7)
3) Bent (104.5)

Question 6

VESPR Steric Number 5

1) AX5
2) AX4E
3) AX3E2

Answer 6

1) Trigonal bipyrmidal
2) Seesaw
3) T-shaped

Question 7

VESPR Steric Number 6

1) AX6
2) AX5E
3) AX4E2

Answer 7

1) Octaheddral
2) Square pyramidal
3) Square planar

Question 8

Draw the two resonance structures for SCN- and the net molecular dipole vector

Answer 8

First one:
S=C=N

Second one
S-C=-N (triple bond)

Goes from netural Fc to negative Fc in both cases

So first one goes from left to right and second one goes from right to left