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Unit 3 Exam Review: Bonding

Total questions: 43

Worksheet time: 2hrs 51mins

Name
Class
Date
1.

How many VALENCE ELECTRONS does Chlorine have?

a)

2

b)

7

c)

8

d)

10

e)

17

2.

Ionic bonds are formed when electrons get

a)

Shared between two atoms

b)

Removed from both atoms

c)

Transferred from one atom to another

d)

Added to both atoms

3.

How many valence electrons does Mg have? (use the PTable)

a)

1

b)

2

c)

3

d)

4

e)

5

4.

Ionic bonds typically form between

a)

A metal and a nonmetal

b)

Two nonmetals

c)

Two metals

d)

A metalloid and a metal

5.

Atoms are most stable when their outer shell is complete.

a)

True

b)

False

6.

Why do elements form chemical bonds?

a)

Because they're friendly

b)

To create a new element

c)

To become stable

d)

Because they all need to gain more electrons

7.

What is the correct formula for Sodium Chloride?

a)

SCl

b)

NaCl

c)

SC

d)

NaCl2

8.

Cations _______ electrons, becoming _______ charged.

a)

Gain; positively (+)

b)

Gain; negatively (-)

c)

Lose; positively (+)

d)

Lose; negatively (-)

9.

Anions ____ electrons, becoming _____ charged.

a)

Gain; positively (+)

b)

Gain; negatively (-)

c)

Lose; positively (+)

d)

Lose; negatively (-)

10.

Write the chemical formula for K and Br (potassium bromide).

a)

KBr

b)

K2Br

c)

KBr3

d)

KBr2

11.

Metals (like Na) typically _____ electrons in the formation of ionic bonds.

a)

Gain

b)

Lose

c)

Keep the same

12.

Nonmetals (like Cl) typically ____ electrons when they form ionic bonds.

a)

Gain

b)

Lose

c)

Keep the same

13.

Why are there two sodiums (Na), in the formation of this ionic compound?

a)

There always has to be 2 metals

b)

The overall charge needs to add up to 4

c)

The overall charge has to be 0

d)

It needs to have more metal atoms than nonmetal

14.
Nitrogen will form which of the following ions?
a)
N
b)
N-3
c)
N-5
d)
N+5
15.
In the compound aluminum oxide, which is the cation?
a)
Al+3
b)
Al
c)
O-2
d)
O
16.

According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.

a)

2

b)

4

c)

6

d)

8

e)

10

17.
Covalent compounds
a)
Share electrons
b)
transfer electrons
c)
contain a sea of electrons
d)
conduct electricity
18.

What 2 types of atoms make a covalent bond?

a)

2 metals

b)

2 noble gases

c)

2 nonmetals

d)

1 metal & 1 nonmetal

19.

How many connection points does carbon have to bond?

a)

2

b)

4

c)

6

d)

8

20.

By replacing the element symbol, this could be a diagram of which element?

a)

Li

b)

Al

c)

C

d)

Be

21.

What is the molar mass of Cl2?

a)

17 g/mol

b)

35.5 g/mo;

c)

71.0 g/mol

d)

89 g/mol

22.

Calculate the molar mass of KOH.

a)

28 g/mol

b)

56 g/mol

c)

84 g/mol

d)

112 g/mol

23.

Calculate the molar mass of CO2.

a)

14 g/mol

b)

28 g/mol

c)

36 g/mol

d)

44 g/mol

24.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
25.
Three pairs of electrons are shared in a
a)
Single bond
b)
Double bond
c)
Triple bond
26.

Draw the lewis dot structure for F2. Which of the following is the correct Lewis dot structure for the molecule F2?

a)

A

b)

B

c)

C

d)

D

27.

How many electrons are shared in each bonding line?

a)

1

b)

2

c)

3

d)

4

28.

Which of these is the correct Lewis structure for NH3?

a)
b)
c)
d)
29.
Which of the following is the correct Lewis structure for CH2O?
a)
Option A
b)
Option B
c)
Option C
d)
Option D
30.
Calculate the Formal Charge for the Oxygen Labeled 1 
a)
-1
b)
+1
c)
0
d)
-2
31.
Calculate the Formal Charge for the Oxygen Labeled 2 
a)
-1
b)
+1
c)
0
d)
-2
32.
Calculate the Formal Charge for the Nitrogen
a)
-1
b)
+1
c)
0
d)
-2
33.
What is the formal charge for Xenon
a)
-1
b)
+1
c)
0
d)
+2
34.

Given the formula representing a compound:


Which formula represents an isomer of this compound?

a)
b)
c)
d)
35.

Which formulas represent compounds that are isomers of each other?

a)
b)
c)
d)
36.
Which of the following is true about structural isomers?
a)
Have the same molecular formula
b)

Have different arrangements of elements

c)
Have the same number of elements
d)
all of the above
37.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

a)

29%

b)

43%

c)

57%

d)

73%

38.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

a)

29%

b)

43%

c)

57%

d)

73%

39.

Identify the substance in box W.

a)

element

b)

compound

c)

mixture

40.

Identify the substance in box Y.

a)

element

b)

compound

c)

mixture

41.

Identify the substance in box D.

a)

element

b)

compound

c)

mixture

42.

Identify the substance in box B.

a)

element

b)

compund

c)

mixture

43.

What type of substance is pictured?

a)

element

b)

compound

c)

mixture

d)

solution

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