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WorksheetsChemistry Semester Exam
Total questions: 75
Worksheet time: 4hrs 27mins
Name
Class
Date
1.
Ionic compounds are written with
a)
cation (+ ion) first then anion (- ion)
b)
anion (- ion) first then cation (+ ion)
c)
either way is fine
d)
polyatomic ions first
2.
Ba+2, Br-1
a)
BrBa
b)
Br2Ba2
c)
BaBr2
d)
Br2Ba
3.
The name of FeCl₂ is
a)
iron chloride
b)
iron (II) chloride
c)
iron (I) chloride
d)
iron dichloride
4.
What is the correct name for HBr?
a)
Bromic acid
b)
Hydrobromic acid
c)
Hydrogen bromate
d)
Hypobromic acid
5.
When adding a subscript to a polyatomic ion, you should...
a)
multiply any subscripts on the polyatomic ion by the subscript you are adding
b)
put parentheses around the polyatomic ion before adding a subscript
c)
write the new subscript next to any subscripts on the polyatomic ion
d)
put the polyatomic ion in square brackets before adding the subscript
6.
What is the correct formula for dinitrogen tetroxide?
a)
N₃O₃
b)
(N₂)₂(O₄)₃
c)
N₂O₄
d)
N₄O₂
7.
What is the correct formula for carbon dioxide?
a)
C2O2
b)
C20
c)
CO
d)
CO2
8.
What is the correct name for CCl4?
a)
carbon tetrachloride
b)
monocarbon tetrachloride
c)
tetracarbon monochloride
d)
carbon chloride
9.
Ionic compounds must have...
a)
a metal and a polyatomic ion
b)
a cation and an anion
c)
only nonmetals
d)
only metals
10.
What is the name of " NO21- "?
a)
nitrogen dioxide
b)
nitrate
c)
nitrite
d)
nitrogen (II) oxide
11.
An element plus additional element reacts to form one product is an example of which type of chemical reaction?
a)
combustion
b)
decomposition
c)
synthesis
d)
single replacement
12.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement
b)
decomposition
c)
combustion
d)
single replacement
13.
What kind of reaction is this:
4Fe + 3O2 → 2Fe2O3
4Fe + 3O2 → 2Fe2O3
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
14.
What kind of reaction is this:
4Fe + 3O2 → 2Fe2O3
4Fe + 3O2 → 2Fe2O3
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
15.
What kind of reaction is this:
2C3H7OH +9O2 -> 6CO2 + 8H2O
2C3H7OH +9O2 -> 6CO2 + 8H2O
a)
Double Replacement
b)
Combustion
c)
Single Replacement
d)
Decomposition
16.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
17.
The reaction below is an example of?
AgNO3 + NaCl → AgCl + NaNO3
AgNO3 + NaCl → AgCl + NaNO3
a)
Single Replacement
b)
Double Replacement
c)
Decomposition
d)
Combustion
18.
What kind of reaction is this:
CaCO3 + Ag2SO4 → CaSO4 + Ag2CO3
CaCO3 + Ag2SO4 → CaSO4 + Ag2CO3
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
19.
Which type of reaction can be recognized by the general pattern?
A + BC--> AC + B
A + BC--> AC + B
a)
Decomposition
b)
Combustion
c)
Single Replacement
d)
Double Replacement
20.
What type of reaction is illustrated below?
2HI --> H2 + I2
2HI --> H2 + I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
21.
Classify
Fe + O2 → Fe2O3
Fe + O2 → Fe2O3
a)
synthesis
b)
decomposition
c)
double replacement
d)
single replacement
22.
Which of the following general formulas represents a single-displacement reaction?
a)
AB → A + B
b)
A + B → AB
c)
A + BC → AC + B
d)
AB + CD → AD + CB
23.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
24.
Si + S8 →Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
25.
AB + CD →AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
26.
Which reaction type is the following: C5H10O4 + O2 --> CO2 + H2O
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Double Replacement
27.
When balancing equations a ____ can be placed or changed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
28.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
29.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
30.
What coefficient goes in the missing blanks? There is only one answer.
SnO2 + __ H2 → Sn + __ H2O
SnO2 + __ H2 → Sn + __ H2O
a)
5
b)
1
c)
3
d)
2
31.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
32.
Balance this equation:
__Li + __Cl2 -> __LiCl
__Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
33.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
34.
Fill in the missing coefficient to balance the equation: Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
35.
Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C6H12O6?
a)
1 mole = 78.12 g
b)
1 mole = 22.4 L
c)
1 mol = 6.02x 1023 particles
d)
more than one
36.
Which conversion factor should be used to solve the following, "How many moles in 28 grams of CO2?"
a)
1 mol = 22.4 L
b)
1 mol = 44.01 g
c)
1 mol = 6.02x1023 atoms
d)
more than one
37.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)
48 g/mole
b)
34.02 g/mole
c)
36.5 g/mole
d)
35.5 g/mole
38.
How many molecules of sugar (C6H12O6) are in a mole?
a)
24 molecules
b)
180 molecules
c)
180 g
d)
6.02 x 1023 molecules
39.
How many molecules are in 2.5 mol of NaCl?
a)
1.51x1023
b)
146
c)
4.15
d)
1.51x1024
40.
Which of the following dimensional analysis setups will correctly convert 2.50 moles of sodium to grams of sodium?
a)
A
b)
B
c)
C
d)
D
41.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
42.
How many grams of Hydrogen are there in 25 moles of water?
a)
25 g
b)
450 g
c)
18 g
d)
50 g
43.
How many particles are in 13.5 grams of Beryllium?
a)
1.5 particles
b)
9 particles
c)
4x1023 particles
d)
9x1023 particles
44.
A three (3.00) mole sample of K2S would have how many atoms of potassium? (only potassium!! Hint a 2 mole sample of H2O would have 4 moles of H's and only 2 moles of O)
a)
2.01 x 1023 atoms
b)
1.21 x 1024 atoms
c)
1.81 x 1024 atoms
d)
3.61 x 1024 atoms
45.
A molecule of glucose is comprised of 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen. According to the above information, what is the molecular mass of glucose?
a)
30.026 g/mol
b)
137.49 g/mol
c)
180.16 g/mol
d)
231.37 g/mol
46.
How many grams of silicon would there be in a sample that contained 9.99 x 1052 atoms?
a)
1.69 x 1028
b)
4.66 x 1030
c)
1.66 x 1073
d)
1.69 x 1078
47.
How many atoms are in 6.3 mol Zn?
a)
6.0x1023atoms Zn
b)
3.8x1024atoms Zn
c)
1.0x10-23atoms Zn
d)
410atoms Zn
48.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
49.
C2H6
a)
Empirical
b)
Molecular
50.
KMnO4
a)
Empirical
b)
Molecular
51.
H2S
a)
Empirical
b)
Molecular
52.
What is the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?
a)
CO2Li3
b)
Li2CO3
c)
Li3CO2
d)
LiCO5
53.
What is the empirical formula for the following molecular formula: C6H14
a)
C6H14
b)
C3H7
c)
CH2
d)
CH3
54.
What is the molecular formula of a compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole?
a)
C2O4H8
b)
C8O2H4
c)
C4O2H8
d)
C4O8H2
55.
Find the percent composition of N2S2.
a)
N: 69.6% S: 30.4%
b)
N:36% S: 75.6%
c)
N: 96.6% S: 3.4%
d)
N: 30.4% S: 69.6%
56.
Find the percent composition of Cu in CuBr2 .
a)
28.45%
b)
32.85%
c)
17.78%
d)
68.10%
57.
What is the percent composition in NaOH of Na?
a)
57.5%
b)
40.00%
c)
25.00%
d)
2.50%
58.
What is the percent composition of S in the formula (NH4)2S ?
a)
12.05%
b)
19.30%
c)
47.11%
d)
56.18%
59.
222.6 g of Sodium combine completely with 77.4 g of Oxygen. What is percent composition of Sodium and Oxygen?
a)
25% Sodium, 74.2% Oxygen
b)
15% Sodium, 85% Oxygen
c)
74.2% Sodium, 25.8% Oxygen
d)
90% Sodium, 10% Oxygen
60.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
61.
Balance this equation
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
62.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
63.
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)
64.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
65.
What is the molar mass of B2(CO3)3?
a)
81.632 g/mol
b)
94.842 g/mol
c)
38.822 g/mol
d)
201.648 g/mol
66.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
67.
What percent of Zn3(PO4)2 is zinc?
a)
33.15%
b)
16.04%
c)
50.81%
d)
19.68%
68.
How many moles are found in 740g of Ca(OH)2
a)
1
b)
10
c)
0.1
d)
74
69.
Mass of one mole of Mg(OH)2
a)
58g
b)
42g
c)
82g
d)
41g
70.
Which compound has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
71.
The best definition for a mole provided below is
a)
The SI unit for the mass of something
b)
The SI unit for the amount of a substance
c)
The SI unit for the volume of something
d)
The SI unit for the area of a substance
72.
Identify the type of chemical reaction being represented in the following equation:
Ca + AlPO4 --> Al + Ca3(PO4)2
Ca + AlPO4 --> Al + Ca3(PO4)2
a)
combustion
b)
synthesis
c)
single
d)
double
73.
Determine the correct name for the following compound: Cr2(SO4)3
a)
chromium sulfate
b)
chromium (III) sulfate
c)
chromium sulfide
d)
chromium (III) sulfide
74.
What is the formula for magnesium chloride?
a)
MgCl
b)
Mg2Cl
c)
MgCl2
d)
Mg(ClO3)2
75.
Sr(OH)2
a)
Strontium Hydroxide
b)
Strontium Hydride
c)
Strontium Dihydroxide
d)
Strontium Dioxygen Dihydride
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