WorksheetsStoichiometry Unit Test
Total questions: 45
Worksheet time: 1hrs 19mins
Name
Class
Date
1.
Metallic sodium reacts violently with water to form hydrogen and sodium hydroxide according to the following equation.
2Na + 2H2O→2NaOH + H2
How many moles of hydrogen gas are generated when 4.0 moles of sodium react with excess water?
2Na + 2H2O→2NaOH + H2
How many moles of hydrogen gas are generated when 4.0 moles of sodium react with excess water?
a)
1 mole H2
b)
2 moles H2
c)
3 moles H2
d)
4 moles H2
2.
Consider this reaction:
3Ca(s) + 2H3PO4 (aq) → Ca3(PO4)2 (s) + 3H2 (g)
How many moles of calcium are required to produce 60.0 g of calcium phosphate?
3Ca(s) + 2H3PO4 (aq) → Ca3(PO4)2 (s) + 3H2 (g)
How many moles of calcium are required to produce 60.0 g of calcium phosphate?
a)
0.145 mole
b)
0.194 mole
c)
0.387 mole
d)
0.581 mole
3.
According to the equation:
2 H2O (l) → 2H2(g) + O2 (g)
What mass of H2O is required to yield 22.4 L of O2 at STP?
2 H2O (l) → 2H2(g) + O2 (g)
What mass of H2O is required to yield 22.4 L of O2 at STP?
a)
12g
b)
18g
c)
24g
d)
36g
4.
Consider this reaction:
3 Mg (s) + 2 H3PO4 (aq)
→ Mg3(PO4)2 (s) + 3H2 (g).
How many grams of magnesium phosphate should be produced if 5.40 grams of magnesium react with excess phosphoric acid?
3 Mg (s) + 2 H3PO4 (aq)
→ Mg3(PO4)2 (s) + 3H2 (g).
How many grams of magnesium phosphate should be produced if 5.40 grams of magnesium react with excess phosphoric acid?
a)
1.80 grams
b)
19.5 grams
c)
58.4 grams
d)
175 grams
5.
Methane (CH4) is burned in oxygen according to this balanced chemical equation:
CH4(g) + 2 O2 (g) → CO2 (g) + 2H2O (g)
What volume of carbon dioxide is formed when 9.36 liters of methane are burned in excess oxygen at STP?
CH4(g) + 2 O2 (g) → CO2 (g) + 2H2O (g)
What volume of carbon dioxide is formed when 9.36 liters of methane are burned in excess oxygen at STP?
a)
9.36 L
b)
15.0L
c)
18.7 L
d)
22.4 L
6.
What is the volume of 2.00 moles of nitrogen gas (N2 ) at STP?
a)
11.2 L
b)
28.0 L
c)
44.8 L
d)
56.0 L
7.
In an experiment, 2.62 g of iron react completely with 1.50 g of sulfur. What is the empirical formula for the compound produced?
a)
FeS
b)
FeS2
c)
Fe2S
d)
Fe2S3
8.
Which compound contains the greatest percent of oxygen by mass?
a)
CO2
b)
NO2
c)
SO2
d)
SiO2
9.
How many moles are in 325 g of (NH4)2Cr2O7?
a)
0.732 mole
b)
0.776 mole
c)
1.29 moles
d)
1.37 moles
10.
How many formula units are in 2.5 mol of NaCl?
a)
1.51x1023
b)
146
c)
4.15
d)
1.51x1024
11.
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
12.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 40.13% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C3H6O3
b)
CH3O
c)
C2H4O2
d)
C3H9O3
13.
What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?
a)
C2H5
b)
C4H10
c)
C1H2.5
d)
C4H8
14.
C4H10
a)
Empirical
b)
Molecular
15.
Fluorine is diatomic. What is the molar mass of fluorine gas?
a)
18.998 g/mol
b)
37.996 g/mol
c)
9 g/mol
d)
18 g/mol
16.
T/F
Two compounds with different molecular formulas can have the same empirical formula.
Two compounds with different molecular formulas can have the same empirical formula.
a)
True
b)
False
17.
What is the percent water in hydrated calcium chloride...CaCl2⋅2H2O?
a)
66.67%
b)
32.47%
c)
24.51%
d)
12.26%
18.
CH4 + 2 O2 → CO2 + 2H2O
In this equation, CH4 is a
a)
product
b)
reactant
c)
replacement
19.
Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
20.
What kind of reaction is this:
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
21.
What kind of reaction is this:
2H2O2 →2 H2O + O2
2H2O2 →2 H2O + O2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Combustion
22.
What kind of reaction is this:
2C3H7OH +9O2 -> 6CO2 + 8H2O
2C3H7OH +9O2 -> 6CO2 + 8H2O
a)
Double Replacement
b)
Combustion
c)
Single Replacement
d)
Decomposition
23.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
24.
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
25.
___C3H8 +___O2 --> ___CO2 + ___H2O
a)
1,5,3,4
b)
2,10,6,8
c)
already balanced
d)
1,5,5,4
26.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
27.
__H2O2 --> __H2O + __O2
a)
already balanced
b)
2,1,1
c)
2,2,1
d)
2,1,2
28.
__(NH4)3PO4 + __Pb(NO3)4 --> __Pb3(PO4)4 + __NH4NO3
a)
2,1,1,6
b)
1,2,2,3
c)
4,3,1,12
d)
4,2,1,12
29.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
30.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
31.
As a product:
Ba(OH)2
Ba(OH)2
a)
soluble
b)
insoluble
32.
As a product:
BaSO4
BaSO4
a)
soluble
b)
insoluble
33.
The atom that serves as the relative standard for determining mass and the number of particles in a mole is:
a)
lead-206
b)
oxygen-16
c)
carbon-12
d)
hydrogen-1
34.
In the equation: Na + H2O → NaOH + H2
The coefficient of water is
a)
2
b)
1
c)
4
d)
3
35.
Based on the activity series, will this reaction occur?
Ni (s) + H2O (l) →
Ni (s) + H2O (l) →
a)
Yes
b)
No
36.
What will be the result of the following:
Br2 + NaF ->
Br2 + NaF ->
a)
bromine will replace Na
b)
Na will replace Br
c)
Br will replace F
d)
no reaction will occur
37.
What will be the result of the following:
Li + NaF ->
Li + NaF ->
a)
Li will replace F
b)
Na will replace Li
c)
Li will replace Na
d)
no reaction will occur
38.
Predict the product(s) of this reaction (Don't worry about balancing)
Pb(NO3)2 + KI →
Pb(NO3)2 + KI →
a)
PbK + I NO3
b)
not possible
c)
PbI2 + KNO3
d)
PbI + KNO3
39.
What will be the result of the following:
K + H2CO3 ->
a)
No Reaction
b)
H + KCO3
c)
KOH + H2O
d)
H2 + K2CO3
40.
What is the generic equation for a double replacement reaction?
a)
AB + CD ---> AD + CB
b)
AB + CD ---> DA + CB
c)
AB + CD ---> A + BC
d)
AB + CD ---> D + CBA
41.
Predict the product(s) of the following reaction
CaCO3 + AgNO3 -->
a)
Ag2CO3 + CaNO3
b)
CaNO3
c)
AgCa
d)
CO3NO3
42.
Which of the following ions will NOT form a precipitate according to the solubility rules?
a)
ammonium phosphate
b)
barium phosphate
c)
beryllium phosphate
d)
magnessium phosphate
43.
Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?
a)
Ca2+(aq) + 2Cl1- (aq) → CaCl(s)
b)
Ag+(aq) + Cl1- (aq) → AgCl(s)
c)
Ag + Cl → AgCl
d)
Ag+ + Ca2+ →Ag2Ca (s)
44.
Which of the following does NOT form a precipitate?
a)
AgNO3(aq) + 2KBr(aq) →
b)
LiNO3 (aq) + NaC2H3O2(aq) →
c)
Ca(NO3)2(aq) + K2CO3(aq) →
d)
Ba(NO3)2 (aq) + Na2SO4(aq) →
45.
How many atoms are in a 3.56 g sample of Cu?
a)
3.37 x 1022 Cu atoms
b)
6.02 x 1023 Cu atoms
c)
0.056 Cu atoms
d)
1 Cu atom
100 %
