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Worksheetsstoichiometry quiz
Total questions: 20
Worksheet time: 59mins
Name
Class
Date
1.
In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?
a)
10:6
b)
3:4
c)
4:3
d)
2:3
2.
N2 + 3F2 ----> 2NF3
Given the equation above, use_______to calculate how many moles of NF3 is produced from 5.65 moles of F2
Given the equation above, use_______to calculate how many moles of NF3 is produced from 5.65 moles of F2
a)
3 and 2
b)
6 and 6
c)
6 and 2
d)
1 and 3
3.
How many moles of H2O are produced by 4.8 moles of O2?
2H2 +O2 -----> 2H2O
2H2 +O2 -----> 2H2O
a)
9.6 mol H2O
b)
317 mol H2O
c)
906 mol H2O
d)
3.7 mol H2O
4.
How many moles of KOH are required to make 3.0 moles of K2SO4?
H2SO4 + 2KOH -----> 2H2O + K2SO4
H2SO4 + 2KOH -----> 2H2O + K2SO4
a)
3 mol KOH
b)
6 mol KOH
c)
18 mol KOH
d)
24 mol KOH
5.
Balance this equation
Zn+HCl-->ZnCl2 +H2
Zn+HCl-->ZnCl2 +H2
a)
Zn+HCl-->2ZnCl2 +H2
b)
Zn+HCl-->ZnCl2 +2H2
c)
Zn+2HCl-->ZnCl2 +H2
d)
2Zn+HCl-->ZnCl2 +H2
6.
WO3 + H2 --> W + H2O
What coefficient goes in front of H2 after you balance it?
What coefficient goes in front of H2 after you balance it?
a)
1
b)
2
c)
3
d)
4
7.
In the reaction 2 H2 + O2 → 2 H2O what is the coefficient of oxygen?
a)
1
b)
2
c)
4
d)
3
8.
Stoichiometry is based on the law of conservation of
a)
charge
b)
mass
c)
reactants
d)
volume
9.
How many molecules are in 1 mole of CO2?
a)
4.6 molecules
b)
4.6 grams
c)
6.02 x 10 23 molecules
d)
1.806x 10 24 atoms
10.
How many molecules are in 1 mole of O2?
a)
32 molecules
b)
32 grams
c)
6.02 x 10 23 molecules
d)
.036 atoms
11.
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
12.
2CO + O2 −-> 2CO2
What is the coefficient of carbon dioxide?
What is the coefficient of carbon dioxide?
a)
2
b)
4
c)
1
d)
5
13.
The first step in stoichiometry is to
a)
Determine a balanced equation
b)
convert grams to moles
c)
convert grams to liters
d)
use the mole ratio
14.
What is stoichiometry?
a)
The study of how the quantities of reactants and products are related in chemical reactions
b)
The study of the speed of reactions
c)
The study of how chemical reactions occur
d)
The study of types of reactions
15.
N2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 5 moles of nitrogen?
How many moles of hydrogen are needed to react with 5 moles of nitrogen?
a)
6 mol H2
b)
2 mol H2
c)
3 mol H2
d)
15 mol H2
16.
N2 + 3H2 → 2NH3
What is the mole ratio between Nitrogen and Ammonia in the above reaction?
What is the mole ratio between Nitrogen and Ammonia in the above reaction?
a)
1 moles NH3 / 2 moles N2
b)
2 moles NH3 / 1 moles N2
c)
2 moles N2 / 3 moles NH3
d)
1 moles N2 / 3 moles NH3
17.
N2 + H2 → NH3
Balance the equation above
Balance the equation above
a)
N2 + 3H2 → NH3
b)
N2 + 3H2 → 2NH3
c)
N2 + 3H2 → N2H6
d)
N2 + 2H2 → 2NH3
18.
3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe
What is the Ratio of moles of MgO to moles Fe?
What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
19.
In a Chemical Reaction, the Law of Conservation of Mass states?
a)
Matter is present.
b)
Matter can NOT be created or destroyed.
c)
Matter is created and destroyed.
d)
Mass is always changing
20.
Calculate the molar mass of Mg(OH)2.
a)
33 g/mol
b)
41 g/mol
c)
87 g/mol
d)
58 g/mol
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