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Exam 3-Chem

front 1

electromagnetic trend down the groups and across the periods

back 1

Down: decrease

Left to right: increase

front 2

qualities of non polar compounds

back 2

symmetrical

AX__

front 3

qualities of polar compounds

back 3

asymmetrical

AX_E_

front 4

bond order trend

back 4

greater energy = shorter bond = stronger

front 5

hybridization of Cl in ClF5

back 5

sp3d

front 6

number of sigma and pi bonds in C2H4

back 6

5 sigma

1 pi

front 7

enthalpy change in H2 + Cl2 -> 2HCl

back 7

-186

front 8

Enthalpy change in Br2 + 3F2 -> 2BrF3

Br-Br 193

F-F 155

Br-F 249

back 8

-836

front 9

trigonal bipyramidal

back 9

5 bond 0 lone

90 120 180

sp3d

front 10

octahedral

back 10

6 bond 0 lone

90 180

sp3d2

front 11

linear

back 11

2 bond 0/3 lone

180

sp / sp3d

front 12

trigonal pyramidal

back 12

3 bond 0 lone

sp2

120

front 13

tetrahedral

back 13

4 bond 0 lone

sp3

109.5

front 14

bent

back 14

2 bond 1/2 lone

120/109.5

sp2 / sp3

front 15

trigonal planar

back 15

3 bond 1 lone

109.5

sp3

front 16

seesaw

back 16

4 bond 1 lone

90 120 180

sp3d

front 17

T shape

back 17

2 bond 3 lone

90 180

sp3d

front 18

square pyramidal

back 18

5 bond 1 lone

90 180

sp3d2

front 19

square planar

back 19

4 bond 2 lone

90 180

sp3d2

front 20

Which one of the following molecules is polar?

SO3 BCl3 Br2 CCl4 SF4

back 20

SF4

front 21

Polar vs Nonpolar

back 21

non polar is symmetrical, with the same X

AX2 AX3 AX4...

front 22

How many equivalent Lewis structures are needed to describe the bonding in the nitrite ion, NO2 - ?
What is the average N-O bond order?

back 22

2 3/2

front 23

Use VSEPR Theory to predict the molecular geometry around the central atom in each of the following molecules. Which of the following molecular geometries are correct?

1. NO3 -, trigonal pyramidal
2. CN-, linear
3. SO2, bent

back 23

2 3

front 24

How many sigma (σ) bonds and pi (π) bonds are in carbon dioxide?

back 24

2 2

front 25

Which combination of atoms is most likely to produce a compound with ionic bonds?

S and O
N and F
B and C
Mg and O
Si and Cl

back 25

Mg and O

front 26

Which molecules have sp3d hybridization?

1. SF4
2. XeF2

back 26

both

front 27

Which has the longest O-O bond? Which has the strongest?

1. H2O2
2. O2

back 27

1 2

front 28

One resonance structure for OCN– ion is drawn below. What is the formal charge on each atom?

back 28

O atom = –1, C atom = 0, and N atom = 0

front 29

Calculate the enthalpy change (Δ rH) for the reaction below,

N2(g) + 3 F2(g) → 2 NF3(g)

given the bond enthalpies of the reactants and products.

BondBond Enthalpy
(kJ/mol×rxn) N–N163 N=N418 N≡N945 F–F155 N–F283

back 29

-288

front 30

Which of the following characteristics apply to NCl3?

1.polar bonds 2.nonpolar molecule 3.triangular-planar molecular shape 4.sp 2 hybridized

back 30

1

front 31

Which of the following compounds has polar covalent bonds : CCl4, Cl2, HCl, and KCl?

back 31

Cl2

front 32

According to molecular orbital theory, which of the following species has the highest bond order?

Li2
F2
C22–
B22+
F22+

back 32

C2 2-

front 33

Bond order formula

back 33

(bonding-antibonding) / 2

front 34

Use VSEPR theory to predict the molecular geometry of BrO4–

back 34

tetrahedral

front 35

Which of the following molecules are nonpolar?

1. NH3
2. CO2
3. F2

back 35

2 3

front 36

Use VSEPR Theory to predict the molecular geometry around the central atom in each of the following molecules. Which of the following molecular geometries are correct?

1. CO2, bent
2. H2O, linear
3. BF3, trigonal planar

back 36

3

front 37

What is the molecular geometry around the central atom of ClF3?

back 37

T-Shape

front 38

formal charge formula

back 38

valence - lone pair electrons - 1/2 bonded electrons

front 39

What is the N–O bond order in NO3–?

back 39

1.33