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CH301 - Unit 2 Exam 1 Review

Total questions: 56

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

What is the hybridization of the central atom of a bent molecule? (AB2E2)

a)

sp

b)

sp2

c)

sp3

d)

sp3d

2.

Rank the crystal lattice energy of the salts MgBr2, KNO3, SrS, LiF, CaI2 from least to greatest. a) b) c) d)

a)

SrS > CaI2 > MgBr2 > KNO3 > LiF

b)

SrS > MgBr2 > CaI2 > LiF > KNO3

c)

KNO3 > LiF > CaI2 > MgBr2 > SrS

d)

SrS > CaI2 > MgBr2 > LiF > KNO3

3.
How do the following two elements bond together?
Cr3+  O2-         
a)
CrO
b)
Cr3O2
c)
Cr2O3
d)
CrO3
4.

What is the molecular shape of a molecule with 5 bonded atoms and 1 lone pair?

a)

Octahedral

b)

Pentagon

c)

Square Pyramid

d)

Square Planar

5.
When metals bond with non-metals they form what type of bonds
a)
covalent
b)
ionic
c)
cooperative
d)
lewis
6.

What is the Electronic Geometry of NH3?

a)

Trigonal Planar

b)

Trigonal Bipyramid

c)

Tetrahedral

d)

Octahedral

7.

CHCl3 has how many double bonds?

a)

0

b)

1

c)

2

d)

3

8.

Which of the following compounds exhibits resonance?

a)

CO2

b)

CO32-

c)

CH3COOH

d)

CH4

9.

What is the Hybridization of ICl3?

a)

sp3d

b)

sp2

c)

sp3

d)

sp3d2

10.

Which of the following is NOT an exception to the octet rule?

a)

BeH2

b)

BF3

c)

SF6

d)

O3

11.

For which of the following compounds is the electronic geometry the same as the molecular geometry?

a)

NH3

b)

XeF4

c)

H2O

d)

CO2

12.
What are the hybridization and the approximate bond angles in CS2?
a)
sp2, 1070
b)
sp3, 1200
c)
sp2, 1200
d)
sp, 1800
13.

Draw the Lewis Dot structure for ICl2- and determine its predicted molecular geometry.

a)

see-saw

b)

trigonal bipyramidal

c)

linear

d)

bent

14.

Which of the following has 1 lone pair on the central atom?

a)

T-Shaped

b)

Trigonal Pyramid

c)

Linear

d)

Square Pyramid

e)

See-Saw

15.

Which of the following has the highest lattice energy?

a)

KI

b)

KCl

c)

LiCl

d)

KBr

16.

Rank the bonds H-F, B-N, N-O, Be-H, C-F From greatest to least difference in electronegativity (DEN)

a)

H-F> C-F > B-N > Be-H > N-O

b)

Be-H < N-O < B-N < H-F < C-F

c)

N-O < Be-H < B-N < H-F < C-F

d)

N-O < Be-H < B-N < C-F < H-F

17.

Bond polarity is always = to molecular polarity

a)

True

b)

False

18.

Which of the following bond type is incorrectly matched with its ΔEN range?

a)

Ionic Bonds ∆EN > 1.0

b)

Non-Polar Bonds ∆EN = 0

c)

Polar Bonds ∆EN > 0

19.

In ranking charge density you should...

a)

First rank total charge in each salt, then rank size for same charge.

b)

First rank size for same charge, then rank total charge in each salt.

c)

Smallest atoms always = highest charge density

d)

Largest atoms always = highest charge denstity

20.
The proper formula for magnesium hydroxide:
a)
MgOH
b)
Mg2OH
c)
Mg(OH)2
d)
Mg2OH2
21.
Which of the following is NOT an ionic compound:
a)
CaO
b)
NaOH
c)
BaCl2
d)
Br2
22.

PF3 has how many lone pairs total?

a)

1

b)

2

c)

10

d)

20

23.

How many total valence electrons are participating in bonding in the molecule above?

a)

8

b)

4

c)

2

d)

3

24.

Carbonate (CO32-) has how many double bonds?

a)

0

b)

1

c)

2

d)

3

25.

What is the hybridization of the nitrogen atom?

a)
sp hybridization
b)
sp2 hybridization
c)
sp3 hybridization
d)
dsp3 hybridization
26.

What is the hybridization of the carbon atom?

a)
sp hybridization
b)
sp2 hybridization
c)
sp3 hybridization
d)
dsp3 hybridization
27.

Which of the following compounds has unpaired electrons on the central atom?

a)

CH4

b)

NBr3

c)

BH3

d)

SF6

28.

Draw the Lewis structure for Ethanol, C2H5OH. How many bonds exist between the two carbons?

a)

one

b)

two

c)

three

29.

Draw the Lewis structure for Ethanol, C2H5OH. How many unshared pairs of electrons are on the oxygen atom?

a)

0

b)

1

c)

2

d)

3

30.

Which of the following does NOT exhibit resonance?

a)

C6H6

b)

NO2-

c)

O3

d)

C2H4

31.

Which of the following is NOT a radical?

a)

NO

b)

NO2

c)

CH3

d)

NO2-

32.

Which of the following molecular geometries is not associated with an expanded valence?

a)

Seesaw

b)

Octahedral

c)

square pyramidal

d)

trigonal pyramidal

33.

What is the number of electrons around the central atom in I3-?

a)

6

b)

8

c)

10

d)

12

34.

In which of the following are the bond angles least distorted by unbonded electron pairs?

a)

CF4

b)

O3

c)

SCl4

d)

H2O

35.

Which of the following has the smallest bond angle?

a)

H2S

b)

CO2

c)

CH4

d)

NH3

36.

What is the Hybridization of XeF4?

a)

sp3d

b)

sp2

c)

sp3

d)

sp3d2

37.

What is the Molecular Shape of ICl3?

a)

Square Planar

b)

See-Saw

c)

T-Shape

d)

Square Pyramid

38.
This structure is called...
a)
tetrahedral
b)
Trigonal pyramidal
c)
Seesaw
d)
Bent/Angular
39.

Which of the following images represents a Trigonal Planar molecular geometry?

a)
b)
c)
d)
40.

Which molecule would have this molecular geometry?

a)

BF3

b)

CH4

c)

PCl5

d)

CO2

41.

What molecular geometry would PH3 have?

a)

Trigonal Pyramidal

b)

Trigonal Bipyramidal

c)

Linear

d)

Bent

42.

A molecular geometry with 2 lone pairs and 4 bonding pairs is

a)

Tetrahedral

b)

Trigonal Bipyramidal

c)

Square Planar

d)

Square Pyramidal

43.
What is the VSEPR theory used to predict?
a)
Bond Strength
b)
Polarity
c)
Molecular Shape
d)
Electronegativity
44.

Classify the above molecule.

a)

Polar

b)

Non polar

45.

Which of the following pairs has the same molecular geometry?

a)

BF3 and PCl3

b)

PCl3 and NBr3

c)

NBr3 and AlCl3

d)

BeCl2 and O3

46.

For CS2, determine its shape and polarity

a)

Linear, Polar molecule

b)

Linear, Non polar molecule

c)

V-shaped, Polar molecule

d)

V-shaped, Non polar molecule

47.

The PCl3 molecule is trigonal pyramidal while the BCl3 molecule is trigonal planar. This is because

a)

the atomic size of phosphorus is bigger than boron

b)

the presence of a lone pair electrons in the PCl3 molecule

c)

the boron atom has d orbitals in its valence shell

d)

the boron-chlorine bond is stronger than the phosphorus-chlorine bond

48.
Choose the correct shape for this molecule:
a)
Trigonal planar
b)
Trigonal pyramidal
c)
Bent
d)
Tetrahedral
49.
Choose the correct shape for this molecule:
a)
linear
b)
Trigonal pyramidal
c)
Bent
d)
Tetrahedral
50.

Is this molecule polar or non-polar?

a)

Polar

b)

Non-polar

51.

Is this molecule polar or non-polar?

a)

Non-polar

b)

Polar

52.

Is this molecule polar or non-polar?

a)

Non-polar

b)

Polar

53.
In a polar covalent bond, electrons are shared ___________.
a)
equally
b)
unequally
c)
between non-metals with similar electronegativities
d)
between a metal and a non-metal
54.
This is an example of a __________ bond.
a)
non-polar covalent
b)
polar covalent
c)
ionic
d)
metallic
55.
What geometry will this molecular structure have?: H2S
a)
bent
b)
tetrahedral
c)
linear
d)
trigonal pyramidal
56.
Will this molecule be polar or nonpolar? H2S
a)
polar
b)
nonpolar

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