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C09 Covalent Bonding

Total questions: 81

Worksheet time: 1hrs 26mins

Name
Class
Date
1.

A covalent bond forms when atoms ___________ electrons.

a)

gain

b)

share

c)

increase

d)

transfer

2.

What is the number of valence electrons for Oxygen?

a)

8

b)

6

c)

5

d)

1

e)

7

3.

Which of the following is the best representation of a molecule of fluorine (F2)?

a)

A

b)

B

c)

C

d)

D

4.

What is it called if there are three-pairs of electrons being shared between two atoms?

a)

Triple Bond

b)

Three Single Bonds

c)

Tribond

d)

Double and Single Bond Combo

5.

Carbon is in 4A, so how many bonds can it form based on electrons needed to fill its outer shell?

a)

1

b)

3

c)

4

d)

5

e)

6

6.

The number of bonds an element will form in a covalent compound will usually be equal to:

(Mark all that apply.)

a)

the number of valence electrons

b)

the number of single electrons in the Lewis structure of the element

c)

the number of electrons needed to fill its outer shell

d)

the "A" group number on the periodic table.

e)

the number of paired electrons in the Lewis structure of the element

7.

What kind of bond does this show?

a)

Ionic

b)

Covalent

8.

What kind of bonds are shown here?

a)

Covalent

b)

Ionic

9.

What type of bonding does this picture show?

a)

Ionic

b)

Covalent

10.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
11.
How many electrons should Lithium have around its Lewis dot model?
a)
1
b)
2
c)
3
d)
4
12.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
13.

Which is the correct structure for NH3?

Pictures correspond with a-d.

a)

Option A.

b)

Option B.

c)

Option C.

d)

Option D.

14.
How many covalent bonds does carbon need to form in order to have a full octet?
a)
2
b)
3
c)
4
d)
5
15.
Which LD Diagram is correct for chloromethane (CH3Cl)
a)
A
b)
B
c)
C
d)
D
16.

What is the correct Lewis Dot Structure for NH3?

a)
b)
c)
d)
17.

H2O has how many lone pairs in the molecule?

a)

0

b)

1

c)

2

d)

3

e)

4

18.

When new chemical bonds form, energy ____________.

a)

is taken into the system.

b)

is released from the system.

c)

stays the same in the system.

19.

Does breaking bonds require energy, release energy, or not involve energy at all?

a)

requires energy to break

b)

releases energy when broken

c)

No energy involved

20.

According to this PE diagram, which element's bond length is longest?

a)

hydrogen

b)

oxygen

c)

nitrogen

21.

According to this PE diagram, which element requires the most energy to break the chemical bond?

a)

hydrogen

b)

oxygen

c)

nitrogen

22.

According to this PE diagram, which element has the weakest chemical bond?

a)

hydrogen

b)

oxygen

c)

nitrogen

23.

According to this PE diagram, which element's bond length is shortest?

a)

hydrogen

b)

oxygen

c)

nitrogen

24.

What type of bond is this?

a)

ionic

b)

covalent

25.

Using the PE diagram, what is the bond length of H2?

a)

74

b)

150

c)

45

d)

-432

e)

0

26.

Using this PE diagram, what is the bond energy for the H-H bond in H2?

a)

74

b)

150

c)

45

d)

-432

e)

0

27.

For this PE diagram, what are the units used for bond length?

a)

picometers

b)

angstrom, Å

c)

kilojoules

d)

kilojoules per mole

e)

electron volts

28.

For this PE diagram, what are the units used for bond enthalpy (bond energy)?

a)

picometers

b)

angstrom, Å

c)

kilojoules

d)

kilojoules per mole

e)

electron volts

29.

Bond enthalpy (bond energy) is

(Mark all that apply)

a)

amount of energy released when a bond is formed

b)

amount of energy needed to form a bond

c)

amount of energy needed to break a bond

d)

amount of energy released when a bond breaks

30.

Nitrogen is in 5A, so how many bonds can it form based on electrons needed to fill its outer shell?

a)

1

b)

3

c)

4

d)

5

e)

2

31.

Hydrogen is in 1A, so how many bonds can it form based on electrons needed to fill its outer shell?

a)

1

b)

3

c)

4

d)

5

e)

2

32.

Oxygen is in 6A, so how many bonds can it form based on electrons needed to fill its outer shell?

a)

1

b)

3

c)

4

d)

5

e)

2

33.

Fluorine is in 7A, so how many bonds can it form based on electrons needed to fill its outer shell?

a)

1

b)

3

c)

4

d)

5

e)

2

34.

The number of valence electrons an element is equal to

a)

"A" group number

b)

IUPAC group number

c)

period number

d)

atomic number

e)

(atomic number) - (mass number)

35.

H2O has how many bonding pairs?

a)

0

b)

1

c)

2

d)

3

36.

What is the number of valence electrons for bromine?

a)

8

b)

6

c)

5

d)

1

e)

7

37.

What is the number of valence electrons for nitrogen?

a)

4

b)

6

c)

5

d)

1

e)

7

38.

What is the number of valence electrons for carbon?

a)

4

b)

6

c)

5

d)

1

e)

7

39.

According to this PE diagram, which element has the strongest chemical bond?

a)

hydrogen

b)

oxygen

c)

nitrogen

40.

According to this PE diagram, which element requires the least amount of energy to break its chemical bond?

a)

hydrogen

b)

oxygen

c)

nitrogen

41.

H2O has how many nonbonding electrons in the molecule?

a)

0

b)

1

c)

2

d)

3

e)

4

42.

NCl3 has how many bonding pairs around the central atom?

a)

0

b)

1

c)

2

d)

3

e)

4

43.

NCl3 has how many lone pairs around the central atom?

a)

10

b)

1

c)

6

d)

9

e)

4

44.

NCl3 has how many lone pairs in the molecule?

a)

10

b)

1

c)

6

d)

9

e)

4

45.

SF2 has how many lone pairs in the molecule?

a)

8

b)

2

c)

6

d)

7

e)

4

46.

SF2 has how many lone pairs around the central atom?

a)

8

b)

2

c)

6

d)

7

e)

4

47.

SF2 has how many bonding electrons around the central atom?

a)

8

b)

2

c)

6

d)

7

e)

4

48.

SF2 has how many nonbonding electrons in the molecule?

a)

10

b)

8

c)

16

d)

12

e)

4

49.

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

50.

Which of these is the correct Lewis structure for SiBr4?

a)

A

b)

B

c)

C

d)

D

51.

What is the correct structure for BF3?

IMPORTANT NOTE: Boron is an exception to the octet rule. B only needs to have a total of 6 electrons in its outer shell for it to be full.

a)
Option A.
b)
Option C.
c)
Option D.
52.

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

a)

There are too many bonds around Si.

b)

There should only be single bonds in this Lewis Structure.

c)

The Structure is missing a triple bond.

d)

Chlorine only has 6 electrons surrounding it.

53.
Which of the following is an acceptable Lewis structure for CH3Cl?
a)
Option A
b)
Option B
c)
Option C
d)
Option D
54.

Which is the correct molecular structure for carbon dioxide, CO2?

a)

b)

c)

d)

55.

Why is this the INCORRECT Lewis structure for carbon dioxide, CO2?

a)

Not enough valence electrons around the carbon atom

b)

too many valence electrons around the left (←) oxygen

c)

not enough valence electrons around the right (→) oxygen

d)

too many bonds attached to the carbon atom

e)

too many bonds attached to the oxygen atom

56.

Which of these is the correct Lewis structure for ethanol, CH3CH2OH?

a)

b)

c)

d)

57.

What kind of bond is between a carbon atom and an oxygen atom in this structure?

a)

single bond

b)

double bond

c)

triple bond

d)

quadruple bond

e)

octuple bond

58.

What kind of bond is between a carbon atom and an oxygen atom in this structure?

a)

single bond

b)

double bond

c)

triple bond

d)

quadruple bond

e)

octuple bond

59.

In a molecule of nitrogen, N2 what kind of bond holds the two nitrogen atoms together?

a)

single bond

b)

double bond

c)

triple bond

d)

quadruple bond

e)

octuple bond

60.

Match the structure with the type of chemical bond.

a)

1.

Single bond

b)

2.

Double bond

c)

3.

Triple bond

d)

No such beast.

4.

Quadruple bond

61.

Which of these is a valid Lewis structure for dichloromethane, CH2Cl2?

a)

b)

c)

d)

e)

62.

Which of these is the valid Lewis structure?

a)

b)

c)

d)

e)

63.

Which of these is the valid Lewis structure?

a)

b)

c)

d)

64.

Which of these is the valid Lewis structure?

a)

b)

c)

d)

65.

Which of these is the valid Lewis structure?

a)

b)

c)

d)

e)

66.

Which of these is the valid Lewis structure?

a)

b)

c)

d)

e)

67.

What is WRONG with this Lewis Structure?

a)

Hydrogen is full with two electrons. The structure shows the hydrogens having 8.

b)

Sulfur normally forms three covalent bonds. The structure shows the sulfur having two bonds.

c)

Sulfur can never be in the middle of the molecule.

d)

Sulfur does NOT have eight electrons in its outer shell

e)

Hydrogen normally forms two bonds. The structure shows only one bond.

68.

What is WRONG with this Lewis Structure?

a)

Nitrogen has TOO MANY electrons in its outer shell.

b)

Nitrogen has TOO FEW electrons in its outer shell.

c)

Iodine has TOO MANY electrons in its outer shell.

d)

Iodine has TOO FEW electrons in its outer shell

e)

Nitrogen has TOO many BONDS

69.
Question Image

The solid blue line represents the potential energy (PE) diagram of the O-H bond. Match the PE diagram with its change of bond length and bond energy with respect to the O-H bond.

a)

higher bond energy and longer bond length than O-H

1.

PE diagram iv

b)

lower bond energy but longer bond length than O-H

2.

PE diagram ii

c)

lower bond energy and shorter bond length

3.

PE diagram i

d)

higher bond energy but shorter bond length

4.

PE diagram iii

e)

O - H bond

5.

PE diagram with the solid blue line

70.

The solid blue line represents the F-F bond in F2. Which of these PE diagrams demonstrates a bond with a LONGER bond length than F2 (solid blue line)? (pick two)

A
B
C
D
71.

The solid blue line represents the F-F bond in F2. Which of these PE diagrams demonstrates a bond with a SHORTER bond length than F2 (solid blue line)? (pick two)

A
B
C
D
72.

The solid blue line represents the F-F bond in F2. Which of these PE diagrams demonstrates a bond with a LOWER bond energy than F2 (solid blue line)? (pick two)

A
B
C
D
73.

The solid blue line represents the F-F bond in F2. Which of these PE diagrams demonstrates a bond with a HIGHER bond energy than F2 (solid blue line)? (pick two)

A
B
C
D
74.

Of the four dashed PE diagrams, which one has a LONG bond length and a HIGH bond energy?

A
B
C
D
75.

Of the four dashed PE diagrams, which one has a LONG bond length but a LOW bond energy?

A
B
C
D
76.

Of the four dashed PE diagrams, which one has a SHORT bond length but a HIGH bond energy?

A
B
C
D
77.

Of the four dashed PE diagrams, which one has a SHORT bond length and a LOW bond energy?

A
B
C
D
78.

The amount of energy needed to (a)   a chemical bond is known as bond energy.

79.

To break a chemical bond, energy is ________ ___.

(a)  

80.

When a chemical bond forms, energy is ________ ___.

(a)  

81.

Bond energy is also the amount of energy given off when a chemical bond (a)   .

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