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Learning Module 21-22 Review

Total questions: 73

Worksheet time: 4hrs 30mins

Name
Class
Date
1.
Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?
a)
A
b)
B
c)
C
d)
D
2.
How many electrons can be used in the Lewis Structure for : NO3 -
a)
23
b)
20
c)
18
d)
24
3.
How many valence electrons are in Phosphorus?
a)
15
b)
4
c)
5
d)
31
4.
How many electrons does each line indicate are shared?
a)
1
b)
2
c)
3
d)
4
5.
What is the correct formula for this molecule?
a)
NH
b)
N3H
c)
NH3
d)
NH4
6.
Which of the following is the correct Lewis structure for the compound PBr3?
a)
structure A
b)
structure B
c)
structure C
d)
structure D
7.
In CO2, how many UNSHARED pairs of electrons does each oxygen have?
a)
2
b)
1
c)
4
d)
6
8.

What is the correct Lewis Dot Structure for ammonia NH3

a)
b)
c)
d)
9.

Which is the correct molecular structure for carbon dioxide?

a)
b)
c)
d)
10.

CCl4 has how many double bonds?

a)

0

b)

1

c)

2

d)

3

11.

In HCN (Carbon is usually the central atom) what kind of bond is between the C and N

a)

Single

b)

Double

c)

Triple

12.

Why is this Lewis Structure incorrect? Select all that apply.

a)

H atoms can only form single bonds before their octet is fulfilled.

b)

There must be a triple bond between C and N to fulfill the octet of all atoms.

c)

Not enough valence are pictured in the diagram.

d)

Hydrogen needs more electrons.

e)

Carbon is missing a lone pair in order to satisfy it's octet.

13.

Why is this Lewis Structure incorrect? Choose all that apply.

a)

There are too many bonds around the Si atom.

b)

The structure only required two double bonds to fulfill the octet.

c)

The Structure is missing a triple bond.

d)

Each chlorine only has 6 electrons surrounding it.

14.

How many total valence electrons were used in creating this lewis structure?

(a)  

15.

Reorder the following steps for drawing lewis structures

a)

Count the Total Valence electrons

(add/subtract if there is a charge)

b)

Draw the skeleton for the lewis structure using only single bonds

c)

Add remaining electrons as Lone pairs (peripheral atoms first).

d)

Check for octet.

e)

Slide in double bonds where needed.

1)
2)
3)
4)
5)
16.

Click on the portion of this image that shows a lone pair of electrons.

A
B
C
D
E
17.

Click on the portion of this image that shows a double bond.

A
B
C
D
E
18.

Click on the portion of this image that shows a single bond.

A
B
C
D
E
19.

How many valence electrons does an Oxygen atom have?

(a)  

20.

How many total valence electrons does NF3 have?

(a)  

21.

Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?

With only 2 elements there is no real central atom.

a)

A

b)

B

c)

C

d)

D

22.

How many total valence electrons does phosphate PO43- have?

(a)  

23.

Draw the Lewis Dot structure for SiBr4 and determine how many lone pair electrons it has?

(a)  

24.

Draw the Lewis Dot structure for NF3 and determine how many lone pair electrons it has?

(a)  

25.

What are valence electrons?

a)

The innermost electrons

b)

The outermost electrons

26.
This is a correct dot diagram for fluorine (F)
a)
true
b)
false
27.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
28.

What is the correct Lewis Dot Structure for ammonia NH3

a)
b)
c)
d)
29.

Which is the correct Lewis structure for carbon dioxide?

a)
b)
c)
d)
30.

How many total electrons are participating in bonding in the molecule CH2O?

a)

8

b)

4

c)

2

d)

3

31.
 A lone pair is defined as
a)
A pair of bonding electrons
b)
One non-bonding electron
c)
A pair of non-bonding electrons
d)
A pair of electrons on the central atom
32.

NH3 has how many lone pairs?

a)

0

b)

1

c)

2

d)

3

33.
This is the correct dot diagram for sodium (Na)
a)
true
b)
false
34.
This is a correct dot diagram for oxygen (O)
a)
true
b)
false
35.

How many valence electrons does Carbon have

a)

1

b)

4

36.

Why does the Lithium have a 2 in front of it

a)

It has a charge of 2

b)

You need 2 lithium to balance out the charge from the oxygen

c)

Lithium had 2 electrons to begin with

d)

There are still 2 electrons left in the valence shell

37.

Why doesn't lithium have any dots around it?

a)

It no longer has any electrons

b)

The electrons are not important in Lithium

c)

Lithium lost all of the electrons in its valence shell

d)

The electrons are represented by the +1 (It has 1 electron)

38.

Which version of carbon is the anion?

a)
b)
c)
39.
For carbonate ions, how many resonance structures can be drawn ?
a)
2
b)
3
c)
4
d)
5
40.

What is the formal charge on the oxygen atom at the top of this Lewis dot structure?

a)

0

b)

-1

c)

+1

d)

-3

41.

What is the formal charge on the phosphorus atom in this Lewis dot structure?

a)

0

b)

-1

c)

+1

d)

-3

42.

What is the formal charge on the oxygen atom at the top of this Lewis dot structure?

a)

0

b)

+1

c)

-1

d)

-2

43.

What is the picture showing?

a)

All of the resonance structures for carbonate.

b)

The formal charge on each atom in carbonate.

c)

The electronegativity for carbonate.

d)

The ionization energy for carbonate.

44.

What is the name for when more than one valid Lewis structure can be drawn for a molecule?

a)

coordinate covalent bond

b)

resonance

c)

endothermic

d)

structural formula

45.

Lewis dot diagrams for sodium (Na) and chlorine (Cl) are shown in the attached diagram. Which of the following best describes what will happen with these two elements forming a bond?

a)

Sodium and chlorine will share their valence electrons

b)

Sodium gains seven electrons and chlorine will gain one electron

c)

Sodium will lose one electron and chlorine will gain one electron

d)

Sodium will gain seven electrons and chlorine will lose one electron

46.

What is the Lewis electron dot structure for the covalent compound sulfur dioxide (SO ₂)?

a)
b)
c)
d)
47.

Which of these is the correct electron dot formula for nitrogen trichloride (NCl₃)?

a)
b)
c)
d)
48.

What is the correct Lewis electron-dot structure for the compound magnesium fluoride, (MgF₂)?

a)
b)
c)
d)
49.

Another name for an ionic compound is a

a)

covalent compound

b)

molecular compound

c)

metallic compound

d)

salt

50.
How many resonance structure for SO2 ?
a)
1
b)
2
c)
3
d)
4
51.
How many resonance structures for CH3COO- ion?
a)
1
b)
2
c)
3
d)
4
52.

Molecule that has less than 8 electrons surrounding the central atom is classified as

a)

even number electron

b)

odd number electron

c)

expanded octet

d)

incomplete octet

53.

Which of the following is true about expanded octets? (Check all that apply.)

a)

Any element can have an expanded octet.

b)

Elements in row 3 and lower on the periodic table can have expanded octets.

c)

An expanded octet is when an element has less than 8 electrons.

d)

An expanded octet is when an element has more than 8 electrons.

e)

An expanded octet is when an atom has an unpaired set of electrons in its outer shell.

54.

Do you think Nitrogen at the central already achieved an octet?

a)

Yes

b)

No

55.

What type of octet has SF6 got?

a)

Achieved octet.

b)

Incomplete octet.

c)

Expanded octet.

d)

Odd number electrons.

56.

Draw the Lewis structure for BH3 on your own. Then compare your drawing to the answer choices, and select the correct drawing for BH3.

a)
b)
c)
d)
57.

Draw the Lewis structure for BeI2. Then compare your drawing to the answer choices, and select the correct answer choice.

a)
b)
c)
d)
58.

This Lewis structure ________________________.

a)

follows the octet rule.

b)

is an incomplete octet.

c)

is an expanded octet.

d)

is a free radical.

59.

What is the name for when more than one valid Lewis structure can be drawn for a molecule?

a)

coordinate covalent bond

b)

resonance

c)

endothermic

d)

structural formula

60.

The correct resonance structure for CO3 2- is _____

a)

structure 1

b)

structure 2

c)

structure 3

d)

all structures are correct

61.

which of the following structures is correct for NO3- ion?

a)

only structure 1

b)

only structure 2

c)

only structure 3

d)

all three structures are correct

62.

Polarity of a molecule is determined by

a)

shape and charge

b)

symmetry/asymmetry of molecule and difference in EN value

c)

difference in EN value and size

d)

difference in EN value and charges

63.

CO2 has polar bonds but is a NON POLAR molecule. Why?

a)

it has an asymmetrical shape

b)

bond polarity or dipole moment between C and O atoms cancel

c)

there is net dipole moment between C and O atoms in molecule

d)

bond polarity does not exist between C+ and O- atoms

64.

Does the following reference Polar, Nonpolar, or both:

"electronegativity values are the same"?

a)

Polar

b)

Nonpolar

c)

Both

65.
Which of the following is an acceptable Lewis structure for CH3Cl?
a)
Option A
b)
Option B
c)
Option C
d)
Option D
66.
Will this molecule be polar or nonpolar? PH3
a)
polar
b)
nonpolar
67.
Which of the following is the correct Lewis structure for CH2O?
a)
Option A
b)
Option B
c)
Option C
d)
Option D
68.

Determine Polarity:

a)

Polar

b)

Nonpolar

69.

2. Which of the following molecules is the least polar?

a)

H − N

b)

H − Si

c)

H − O

d)

H − C

70.
Calculate the Formal Charge for the Oxygen Labeled 1 
a)
-1
b)
+1
c)
0
d)
-2
71.
Calculate the Formal Charge for the Nitrogen
a)
-1
b)
+1
c)
0
d)
-2
72.
What is the formal charge for Selenium
a)
+1
b)
-1
c)
0
d)
-2
73.
How many resonance structure can you draw for benzene?
a)
1
b)
2
c)
3
d)
4

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