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Unit 5 Review

Total questions: 50

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

Carbon has four electrons in its valence shell. How many more electrons does carbon need to have a full valence shell?

a)

2 more

b)

4 more

c)

8 more

d)

0 more, it is already full

2.

Which compound would share its valence electrons?

a)
NaI
b)
K2O
c)
N2O3
d)
BeO
3.
Which two elements would form an ionic bond?
a)
carbon and hydrogen
b)
oxygen and silicon
c)
cesium and iodine
d)
potassium and calcium
4.
Which of the following is a property of all covalent compounds?
a)
They are formed froma metal and a nonmetal.
b)
They are solids.
c)
They share electrons.
d)
They conduct electricity.
5.

Hydrogen has one electron in its valence shell. How many more electrons does hydrogen need to have a full valence shell?

a)

2 more

b)

7 more

c)

1 more

d)

0 more, it is already full

6.
Atoms want _____ electrons in their valence (outermost) shell. 
a)
1
b)
2
c)
6
d)
8
7.

This could be the lewis dot structure of which element?

a)

Mg

b)

Cl

c)

C

d)

O

8.

This is a correct dot diagram for neon (#10).

a)

true

b)

false

9.

This is the correct dot diagram for nitrogen.

a)

true

b)

false

10.

How many valence electrons should sodium (#11) have?

a)

1

b)

2

c)

3

d)

4

11.

How would you draw a Lewis dot diagram for Magnesium?

a)
b)
c)
d)
12.

What are valence electrons?

a)

The innermost electrons

b)

The outermost electrons

13.

Which is the correct molecular structure for carbon dioxide CO2?

a)
b)
c)
d)
14.

The total valence electrons for (NO3) -1 would be...?

a)

23

b)

24

c)

22

15.

The total valence electrons for (NH4)+1 would be...?

a)

10

b)

9

c)

8

16.
How many valence electrons does a Sulfur atom have?
a)
2
b)
4
c)
6
d)
7
17.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
18.

What is it called if there are three pairs of electrons being shared?

a)

Triple bond

b)

Bond length

c)

Tribond

d)

Chocolate Mousse

19.
What is it called when atoms share one pair of electrons?
a)
A double bond
b)
A triple bond
c)
A quadruple bond
d)
A single bond
20.
What is it called when atoms share two pairs of electrons?
a)
A double bond
b)
A single bond
c)
A triple bond
d)
A quadruple bond
21.

When drawing Lewis dot structures, your central atom will be the one with the MOST unpaired electrons.

a)

true

b)

false

22.

The electrons in the outermost orbit of an atom.

a)

Electrons

b)

Valence Electrons

c)

Valence Nuetrons

d)

Valence Protons

23.

Atoms of elements gain, lose, or share electrons to have eight electrons in their outermost shells (their valence shells are completely full).

a)

Octet Rule

b)

Valence Electrons

c)

Ion

d)

Diatomic Molecules

24.

 A representation of an atom, ion, or molecule that uses the chemical symbol of an element to represent one atom and dots representing valence electrons.

a)

Atomic Structure

b)

Resonance Structure

c)

Diatomic Molecules

d)

Lewis Dot Structure

25.

A covalent bond in which one pair of electrons are shared by two atoms.

a)

Single Bond

b)

Double Bond

c)

Triple Bond

d)

Lone Pair

26.

A covalent bond in which two pairs of electrons are shared by two atoms.

a)

Single Bond

b)

Double Bond

c)

Triple Bond

d)

Lone Pair

27.

A covalent bond in which three pairs of electrons are shared by two atoms.

a)

Single Bond

b)

Double Bond

c)

Triple Bond

d)

Lone Pair

28.

A pair of valence electrons that are not shared with another atom in a covalent bond.

a)

Ionic Bond

b)

Octet Rule

c)

Valence Electrons

d)

Lone Pair

29.
How many resonance structures for NO3- ion?
a)
1
b)
2
c)
3
d)
4
30.

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.

31.

Structures that have two or more possible electron structures.

a)

Structures

b)

Compounds

c)

Resonance Structures

d)

Single Bond

32.

Which Lewis Dot Diagram would represent Chlorine?

a)
b)
c)
d)
33.

What is the correct Lewis Dot Structure for ammonia NH3

a)
b)
c)
d)
34.

How many total valence electrons are participating in bonding with this compound?

a)

8

b)

4

c)

2

d)

3

35.

How many lone pairs are in this compound?

a)

4

b)

2

c)

1

d)

3

36.

How many BONDS are in this compound?

a)

4

b)

8

c)

2

d)

3

37.

NH3 has how many lone pairs?

a)

0

b)

1

c)

2

d)

3

38.
Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?
a)
A
b)
B
c)
C
d)
D
39.
Which of the following is an acceptable Lewis structure for CH3Cl?
a)
Option A
b)
Option B
c)
Option C
d)
Option D
40.

Which of the following is the correct Lewis structure for water?

a)
A
b)
B
c)
C
41.
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
42.

Which of the following compounds has only single bonds?

a)

I only

b)

II only

c)

III only

d)

I and III

e)

III and IV

43.

What is the correct structure for BF3?

a)

Option A.

b)

Option B.

c)

Option C.

d)

Option D.

44.

CCl4 has how many double bonds?

a)

0

b)

1

c)

2

d)

3

45.

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

a)

Single

b)

Double

c)

Triple

46.

Which of the following IS a diatomic molecule?

a)

Be2

b)

Br2

c)

B2

d)

Ba2

47.

Which of the following is NOT a diatomic molecule?

a)

O2

b)

H2

c)

I2

d)

P2

48.

Which element will be central in SO2?

a)

S

b)

O2

c)

O

d)

SO2

49.

Which element will be central in HCN?

a)

H

b)

C

c)

N

d)

C or N

50.

To check if you have drawn the lewis dot structure correctly, you should ONLY count the total valence electrons.

a)

True

b)

False

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