Exam 3-Chem Flashcards

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1

electromagnetic trend down the groups and across the periods

Down: decrease

Left to right: increase

2

qualities of non polar compounds

symmetrical

AX__

3

qualities of polar compounds

asymmetrical

AX_E_

4

bond order trend

greater energy = shorter bond = stronger

5

hybridization of Cl in ClF5

sp3d

6

number of sigma and pi bonds in C2H4

5 sigma

1 pi

7

enthalpy change in H2 + Cl2 -> 2HCl

-186

8

Enthalpy change in Br2 + 3F2 -> 2BrF3

Br-Br 193

F-F 155

Br-F 249

-836

9

trigonal bipyramidal

5 bond 0 lone

90 120 180

sp3d

10

octahedral

6 bond 0 lone

90 180

sp3d2

11

linear

2 bond 0/3 lone

180

sp / sp3d

12

trigonal pyramidal

3 bond 0 lone

sp2

120

13

tetrahedral

4 bond 0 lone

sp3

109.5

14

bent

2 bond 1/2 lone

120/109.5

sp2 / sp3

15

trigonal planar

3 bond 1 lone

109.5

sp3

16

seesaw

4 bond 1 lone

90 120 180

sp3d

17

T shape

2 bond 3 lone

90 180

sp3d

18

square pyramidal

5 bond 1 lone

90 180

sp3d2

19

square planar

4 bond 2 lone

90 180

sp3d2

20

Which one of the following molecules is polar?

SO3 BCl3 Br2 CCl4 SF4

SF4

21

Polar vs Nonpolar

non polar is symmetrical, with the same X

AX2 AX3 AX4...

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?

2 3/2

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

2 3

24

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

2 2

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

Mg and O

26

Which molecules have sp3d hybridization?

1. SF4
2. XeF2

both

27

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

1. H2O2
2. O2

1 2

28

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

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

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

-288

30

Which of the following characteristics apply to NCl3?

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

1

31

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

Cl2

32

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

Li2
F2
C22–
B22+
F22+

C2 2-

33

Bond order formula

(bonding-antibonding) / 2

34

Use VSEPR theory to predict the molecular geometry of BrO4–

tetrahedral

35

Which of the following molecules are nonpolar?

1. NH3
2. CO2
3. F2

2 3

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

3

37

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

T-Shape

38

formal charge formula

valence - lone pair electrons - 1/2 bonded electrons

39

What is the N–O bond order in NO3–?

1.33