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practice exam ii

Total questions: 100

Worksheet time: 2hrs 38mins

Name
Class
Date
1.

What are valence electrons?

a)

The innermost electrons

b)

The outermost electrons

2.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
3.

Determine the molecular geometry of the given structure.

a)

Trigonal Pyramidal

b)

Trigonal Bipyramidal

c)

Trigonal Planar

d)

Tetrahedral

4.

What two types of atoms make a covalent bond?

a)

2 Nonmetals

b)

1 Nonmetal and 1 Metal

c)

2 Metals

d)

2 Noble Gases

5.
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
6.
In covalent bonds, electrons are ___________.
a)
transferred
b)
gained
c)
lost
d)
shared
7.

Is this molecule polar or non-polar?

a)

Non-polar

b)

Polar

8.

Is this molecule polar or non-polar?

a)

Non-polar

b)

Polar

9.

Is this molecule polar or non-polar?

a)

Polar

b)

Non-polar

10.

Is this molecule polar or non-polar?

a)

Polar

b)

Non-polar

11.

What is the molecules molecular geometry name?

a)

Bent 1

b)

Bent 2

c)

Trigonal Pyramidal

d)

Trigonal Planar

12.

What is the molecules molecular geometry name?

a)

Bent 1

b)

Bent 2

c)

Trigonal Pyramidal

d)

Trigonal Planar

13.
What geometry will this molecular structure have?: H2S
a)
bent
b)
tetrahedral
c)
linear
d)
trigonal pyramidal
14.
Choose the correct shape for this molecule:
a)
linear
b)
Trigonal pyramidal
c)
Bent
d)
Tetrahedral
15.
Choose the correct shape for this molecule:
a)
Bent
b)
Trigonal pyramidal
c)
Trigonal planar
d)
Linear
16.
Choose the correct shape for this molecule:
a)
Trigonal planar
b)
Trigonal pyramidal
c)
Bent
d)
Linear
17.
Choose the correct shape for this molecule:
a)
Trigonal planar
b)
Trigonal pyramidal
c)
Tetrahedral
d)
Linear
18.

Describe the shape of the molecule.

a)

linear

b)

bent

c)

trigonal pyramidal

d)

tetrahedral

19.

Describe the shape of the molecule.

a)

linear

b)

bent

c)

trigonal pyramidal

d)

tetrahedral

20.

Describe the shape of the molecule.

a)

linear

b)

bent

c)

trigonal pyramidal

d)

tetrahedral

21.
Choose the correct shape for this molecule:
a)
linear
b)
Trigonal pyramidal
c)
Bent
d)
Tetrahedral
22.
What geometry will this molecular structure have?: H2S
a)
bent
b)
tetrahedral
c)
linear
d)
trigonal pyramidal
23.

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

a)

-1

b)

+1

c)

-2

d)

+2

24.

How many resonance structures can be drawn for nitrate?

a)

0

b)

1

c)

2

d)

3

25.

How many resonance structures can be drawn for NOCl?

a)

0

b)

1

c)

2

d)

3

26.

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

a)

0

b)

-1

c)

+1

d)

-3

27.

What is the formal charge on the oxygen at the the bottom left in this Lewis dot structure?

a)

0

b)

+1

c)

-1

d)

-2

28.

Which of the following applies to IF41+

a)

incomplete octet

b)

follows the octet rules

c)

free radical

d)

expanded octet

29.

Which of the following forms an incomplete octet?

a)

CO2

b)

BrCl2

c)

H2O

d)

BeCl2

30.

Which element should be used as the central atom of a Lewis structure?

a)

The least electronegative element will be the central atom.

b)

The most electronegative will be the central atom.

c)

The largest atomic radius will be the central atom.

d)

The smallest atomic radius will be the central atom.

31.

What is the molecular geometry of SO2?

a)

bent <120°

b)

bent <109.5°

c)

linear

d)

trigonal planar

32.

What is the molecular geometry of BF3?

a)

bent

b)

trigonal planar

c)

tetrahedral

d)

trigonal pyramidal

33.

What statement describes the below equation?

a)

The iodine molecule transfers two protons to magnesium.

b)

Magnesium shares two electrons with the iodine molecule.

c)

Magnesium transfers an electron to each atom of the iodine molecule.

d)

Iodine becomes a free monatomic element, while magnesium becomes an anion.

34.

Consider the following ball and stick diagrams.

Which of the following diagrams represent a tetrahedral shape?

a)

Figure 1

b)

Figure 2

c)

Figure 3

d)

Figure 4

e)

Figure 5

35.

Based on the VSEPR theory, what is the molecular geometry of NF3?

(Draw it first!)

a)

Linear

b)

Bent

c)

Trigonal Planar

d)

Trigonal Pyramidal

e)

Tetrahedral

36.
How many electrons does each line indicate are shared?
a)
1
b)
2
c)
3
d)
4
37.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
38.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
39.

This is a correct dot diagram for neon (Ne)

a)

true

b)

false

40.

This is a correct dot diagram for nitrogen (N)

a)

true

b)

false

41.

How many valence electrons should Lithium have in its Lewis dot model?

a)

1

b)

2

c)

3

d)

4

42.

What is the goal of the Lewis Dot Structure?

a)

To determine the electron position.

b)

To show the element's valence electrons & bonding capabilities.

c)

To find the atomic mass of an element.

d)

To search for the number of electrons in an individual atom.

43.
Hydrogen needs _____ electrons in its valence shell to be stable.
a)
4
b)
6
c)
8
d)
2
44.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
45.

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.

46.

What is the correct Lewis structure for NH3?

a)
b)
c)
d)
47.
How many electrons does each line indicate are shared?
a)
1
b)
2
c)
3
d)
4
48.
How many valence electrons are in Phosphorus?
a)
15
b)
4
c)
5
d)
31
49.
How many valence electrons are available for bonding in the sulfate ion (SO4-2)?
a)
30 electrons
b)
32 electrons
c)
28 electrons
d)
impossible to tell
50.
What is the correct structure for BF3?
a)
Option A.
b)
Option B. 
c)
Option C.
d)
Option D.
51.
How many electrons can be used in the Lewis Structure for : NO3 -
a)
23
b)
20
c)
18
d)
24
52.
Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?
a)
A
b)
B
c)
C
d)
D
53.
A covalent bond is
a)
a bond that shares electrons metallicaly
b)
A bond that shares electrons with non metals
c)
Metalloids bonding
d)
metals and nonmetals bonding
54.
Three pairs of electrons are shared in a
a)
Single bond
b)
Double bond
c)
Triple bond
55.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
56.

What is your favorite class (in this case, give me the answer I want to hear). :)

a)

Algebra

b)

Geometry

c)

History

d)

Chemistry

57.

Determine if this is ionic or compound, then write the formula: Tin (IV) sulfate

a)

Covalent: SnSO4

b)

Covalent: SnSO

c)

Ionic: Sn2(SO4)4

d)

Ionic: Sn(SO4)2

58.

Which of the following is a polyatomic anion?

a)

Cl-

b)

S2O32-

c)

NH4+

d)

Ca2+

59.

Which of the following is a monatomic cation?

a)

OH-

b)

NH4+

c)

Fe3+

d)

S2-

60.

Determine if this is ionic or compound, then write the formula: tetraphosphorus decoxide

a)

Covalent: PO

b)

Covalent: P4O10

c)

Ionic: PO

d)

Ionic: P10O4

61.

Determine if this is ionic or compound, then write the formula: Sulfur hexafluoride

a)

Covalent: S6F

b)

Covalent: SF6

c)

Ionic: SF6

d)

Ionic: SF

62.

Determine if this is ionic or compound, then write the formula: Aluminum hydroxide

a)

Covalent: AlOH

b)

Covalent: Al(OH)3

c)

Ionic: Al(OH)3

d)

Ionic: AlOH

63.

Determine if this is ionic or compound, then write the formula: sodium phosphate

a)

Covalent: NaPO4

b)

Covalent: Na3PO4

c)

Ionic: Na3PO4

d)

Ionic: Na3P

64.

Determine if this is ionic or compound, then name it.

P3Cl7

a)

Covalent; Phosphorus chloride

b)

Covalent; Triphosphorus heptachloride

c)

Ionic; Triphosphorus heptachloride

d)

Ionic; Phosphorus chloride

65.

Determine if this is ionic or compound, then name it.

N2O4

a)

Ionic; Dinitrogen tetroxide

b)

Ionic; Nitrogen oxide

c)

Covalent; Dinitrogen tetroxide

d)

Covalent; Tetranitrogen dioxide

66.

Determine if this is ionic or compound, then name it.

Fe(OH)3

a)

Covalent; Iron hydroxide

b)

Ionic; Iron (III) hydroxide

c)

Ionic; Iron hydroxide

d)

Covalent; Iron oxide trihydride

67.

Determine if this is ionic or compound, then name it.

MgCl2

a)

Ionic; Magnesium (II) chloride

b)

Covalent; Magnesium dichloride

c)

Covalent; Dimagnesium chloride

d)

Ionic; Magnesium chloride

68.

Determine if this is ionic or compound, then name it.

Silicon tetrafluoride

a)

Covalent; SiF4

b)

Ionic; SiF4

c)

Covalent; Si4F

d)

Ionic; Si4F

69.

Which type of compound forms between two nonmetals?

a)

Ionic

b)

Covalent

70.

What type of compound forms between a metal and a nonmetal?

a)

Ionic

b)

Covalent

71.

What is the oxidation number for Hydrogen in NH3

a)

4+

b)

4-

c)

3-

d)

3+

72.

The oxidation number for Fluorine is

a)

Always 0

b)

-1 in all compounds

c)

+1 in all compounds

d)

Equal to the negative charge of all the metal ions in a compound

73.

What is the formula for the covalent compound Sulfur dioxide?

a)

SiO2

b)

SO2

c)

S2O

d)

S2O2

74.

Name the covalent compound SO3

a)

Monosulfur Trioxide

b)

Silver Trioxide

c)

Sulfur Trioxide

d)

Sulfur Oxide

75.

What is the name for the ionic compound Ni(ClO4)2?

a)

Nickel (II) Perchlorate

b)

Nickel (II) Perchloride

c)

Nickel (II) Perchlorite

d)

Nickel Perchlorate

76.

What is the formula for the ionic compound Strontium Hypochlorite?

a)

SrClO

b)

SrClO2

c)

Sr(ClO)2

d)

Sr(ClO)

77.

What is the formula for the ionic compound formed by Copper (II) and chromate?

a)

CuCrO4

b)

Cu2CrO4

c)

Cr2(CrO4)3

d)

Cu(CrO4)2

78.

What is the chemical name for (CrO4)2-

a)

Chromite

b)

Chromium Oxide

c)

Chromium Tetraoxide

d)

Chromate

79.

What is the charge of a Chromate Ion?

a)

+/-4

b)

-2

c)

-3

d)

+2

80.

What is the chemical formula for iron(III) oxide?

a)

Fe2O3

b)

FeO

c)

Fe3O2

d)

FeO3

81.

What is the chemical formula for sodium hydroxide?

a)

NaOH

b)

NaH

c)

NaO

d)

Na2O

82.

What is the chemical formula for copper(II) sulfate?

a)

CuSO4

b)

Cu2SO4

c)

Cu(SO4)2

d)

SO4Cu

83.

What is the chemical formula for calcium carbonate?

a)

CaCO3

b)

Ca2CO3

c)

Ca(CO3)2

d)

CaCO2

84.

What is the chemical formula for aluminum oxide?

a)

Al2O3

b)

AlO

c)

Al3O2

d)

AlO2

85.

What is the chemical formula for potassium iodide?

a)

KI2

b)

KIO

c)

K2I

d)

KI

86.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

NaPO4

87.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

88.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)
K8SO16
c)
K8S4O8 
d)
K8S4O16 
89.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
 NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
90.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
91.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
92.

How many Carbons "C" are in C18H34O3

a)

18

b)

34

c)

3

d)

37

93.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
94.

What is the percent composition by mass of sulfur (S) in the compound MgSO4?

a)

20.22%

b)

19.85%

c)

26.64%

d)

28.64%

95.

How many grams are in 1.2 x 1024 atoms of C?

a)

29.34 grams

b)

23.94 grams

c)

6.02 grams

d)

1.21 grams

96.

How many moles are in 3.01 x 1022 atoms of magnesium?

a)

0.05 moles

b)

1.81 x 1046 moles

c)

5.00 x 1021 moles

d)

5.00 moles

97.

How many moles are in 19.82 g Mg?

a)

1.23 mol Mg

b)

481.70 mol Mg

c)

1.00 mol Mg

d)

0.82 mol Mg

98.

How many molecules are in 2.5 mol of NaCl?

a)

1.5 x 1024 molecules

b)

1.5 molecules

c)

4.15 molecules

d)

1.5 x 1023 molecules

99.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
100.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)

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