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WorksheetsMonache Stoichiometry Test Review
Total questions: 39
Worksheet time: 1hrs 17mins
Name
Class
Date
1.
Balance this reaction: ____ HCN + ____ CuSO4 ---->____ H2SO4 + ____ Cu(CN)2
a)
2,1,1,2
b)
2,1,1,1
c)
1,2,2,1
d)
1,2,1,1
2.
If the equation is balanced, what will the coefficient on Oxygen gas?
Al + O2 → Al2O3
Al + O2 → Al2O3
a)
2
b)
3
c)
1
d)
4
3.
Which satement is true?
a)
When balancing a reaction, change the subscripts as needed.
b)
Chemical reactions do not follow the law of conservation of matter.
c)
Products are written to the left of the arrow.
d)
The coefficient represents the number of molecules present.
4.
In the following chemical reaction, how many hydroxide (OH) molecules are represented?
CoBr3+3CsOH--> Co(OH)3+3CsBr
CoBr3+3CsOH--> Co(OH)3+3CsBr
a)
3
b)
6
c)
1
d)
2
5.
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
6.
When converting from the mass of a product to the mass of a reactant, the mass of the product is first converted to
a)
the mass of the reactant
b)
moles of the reactant
c)
moles of the product
d)
mass of the product
7.
If 4.0 moles of AgNO3 are used up, how many moles of Pb(NO3)2 are produced?
PbCl2 + 2AgNO3 → Pb(NO3)2 + 2AgCl
PbCl2 + 2AgNO3 → Pb(NO3)2 + 2AgCl
a)
8.0 moles
b)
2.0 moles
c)
1.0 moles
d)
4.0 moles
8.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
9.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
10.
What is the molar mass of CH4?
a)
16.05
b)
16.04
c)
16.03
d)
16.02
11.
How many moles is 4 grams of Calcium?
a)
0.10 moles
b)
10 moles
c)
44 moles
d)
160 moles
12.
In chemistry, a "mole" is:
a)
6.02x1022 particles
b)
3.01x1022 particles
c)
6.02x1023 particles
d)
12.02x1023 particles
13.
How many molecules are there in 5.9 moles of NaCl?
a)
3.5x1024molecules
b)
9.79x10-24molecules
c)
1.02x1023molecules
14.
A mole of Neon contains
6.02 x 1023 _____.
6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
15.
How many grams are in 1.2 x 1024 molecules of CO?
a)
28 grams
b)
56 grams
c)
6.02 grams
d)
1.2 grams
16.
How many molecules are in 2.5 mol of NaCl?
a)
1.51x1023
b)
146
c)
4.15
d)
1.51x1024
17.
How many Hydrogen atoms are in 2 moles of H2O?
a)
2.4 x 1024 atoms
b)
2.4 x 1023 atoms
c)
3.01 x1023 atoms
d)
1.5 x 1023 atoms
18.
A container with a volume of 893 L contains how many moles of air at STP?
a)
20003.2 L
b)
39.9 L
c)
22.4 L
d)
none of the choices
19.
N2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
20.
2Al + 6HCl --> 2AlCl3 + H2
What type of reation is this?
What type of reation is this?
a)
Single Displacement
b)
Double Displacement
c)
Combustion
d)
Synthesis
21.
What type of chemical reaction is this one?
C2H2 + O2 → CO2 + H2O
C2H2 + O2 → CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
22.
Zn + S8 → ZnS
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Combustion
23.
Al2S3 → Al + S8
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
Double Replacement
24.
What are always the product(s) for the combustion of a hydrocarbon?
a)
O2
b)
Acids and Bases
c)
H2O and CO2
d)
H2 and C
25.
Which of the following is an example of synthesis?
a)
Na + Br2 → NaBr
b)
KClO3 → KCl + O2
c)
HgO + Cl2 → HgCl + O2
d)
Cl2 + NaBr → NaCl + Br2
26.
Balance this equation:
__Li + __Cl2 → __LiCl
__Li + __Cl2 → __LiCl
a)
2Li + Cl2 → 4LiCl2
b)
2Li + Cl2 → LiCl2
c)
2Li + 1Cl2 → 2LiCl
27.
Write a Balanced Equation for this reaction:
C2H4 + 2 O2 → ____________
C2H4 + 2 O2 → ____________
a)
C2O2 + H4
b)
CO2 + HOH
c)
NR
d)
2 CO2 + 2H2O
28.
How many grams are in 7.8 moles of NaCl?
a)
476grams
b)
460 grams
c)
452 grams
d)
462 grams
29.
WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
What coefficient goes in front of H2?
a)
1
b)
2
c)
3
d)
4
30.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
31.
In the reaction 2 H2 + O2 → 2 H2O what is the mole ratio of oxygen to water
a)
1:2
b)
2:1
c)
3:4
d)
4:3
32.
What is the molar mass of CH4
a)
16.05 g/mol
b)
16.04 g
c)
16.03 g/molecule
d)
16.02 atoms/gram
33.
In order for a reation to take place,
a)
chemical bonds must remain in place
b)
chemical bonds must be broken
c)
nothing happens to the bonds
34.
Which letter corresponds to the activation energy of the forward reaction?
a)
A
b)
B
c)
C
d)
D
35.
The required energy to make a reaction start-
a)
initiation energy
b)
starting energy
c)
activation energy
d)
key energy
36.
If the theoretical yield is 2.0 g and you get 1.5 grams, what is your percent yield?
a)
15%
b)
20%
c)
50%
d)
75%
37.
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
a)
theoretical yield
b)
mole ratio
c)
actual yield
d)
percentage yield
38.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
39.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
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