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WorksheetsStoichiometry Quiz
Total questions: 20
Worksheet time: 2hrs 44mins
Name
Class
Date
1.
Molar masses are determined from
a)
the mole ratio of a given amount of reactant to an unknown amount of product
b)
the periodic table
c)
any mole ratio in the equation
d)
a conversion factor
2.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
3.
What is the theoretical yield?
a)
the maximum amount of product from a reaction
b)
the amount of product recovered from a lab experiment
c)
amount of product that causes the reaction to stop
d)
the amount of product needed to reverse the reaction
4.
N2 + 3H2 −-> 2NH3
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
a)
6 moles Ammonium
b)
1.5 moles ammonium
c)
9 moles ammonium
d)
9 moles hydrogen
5.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
6.
Considering the UNBALANCED reaction:
Fe2O3(s) + CO(g) --> Fe(m) + CO2(g)
If 32 moles of iron metal was produced during the reaction, how many moles of carbon monoxide were consumed?
Fe2O3(s) + CO(g) --> Fe(m) + CO2(g)
If 32 moles of iron metal was produced during the reaction, how many moles of carbon monoxide were consumed?
a)
21 moles
b)
21.3 moles
c)
48 moles
d)
64 moles
7.
How many grams are in 1.5 moles of O?
a)
9.03 x 1023 grams
b)
16 grams
c)
24 grams
d)
6.02 x 1023 grams
8.
How many moles is 4 grams of Calcium?
a)
0.10 moles
b)
10 moles
c)
44 moles
d)
160 moles
9.
How many moles are in 6x1022 particles of CO2?
a)
0.1 moles
b)
4.4 moles
c)
10 moles
d)
264 moles
10.
2CO + O2 −-> 2CO2
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
a)
10
b)
20
c)
1
d)
5
11.
What is stoichiometry?
a)
Math of Chemistry
b)
Something I will NEVER use
c)
Way to balance equations
d)
way to calculate atomic mass
12.
How many particles are in 13.5 grams of Beryllium?
a)
1.5 particles
b)
9 particles
c)
4x1023 particles
d)
9x1023 particles
13.
B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
14.
4 Al + 3 O2 –> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
15.
What is the percent yield of the following reaction if 145g of P2O5 reacts with 40 grams of water, but you only collected 112 grams of phosphoric acid? 3 H2O + P2O5 -> 2H3PO4
a)
80%
b)
85%
c)
77%
d)
58%
16.
How many liters of NH3 are needed to react completely with 30.0L of NO?
4NH3+6NO --> 5N2 + 6H2O
4NH3+6NO --> 5N2 + 6H2O
a)
5.0 L
b)
20.0 L
c)
7.5 L
d)
120.0 L
17.
Use the equation
2Al + 3Cl2 ---> 2AlCl3.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
2Al + 3Cl2 ---> 2AlCl3.
If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
18.
In most chemical reactions the amount of product obtained is
a)
equal to the theoretical yield.
b)
less than the theoretical yield.
c)
more than the theoretical yield
d)
more than the percentage yield
19.
Balance the equation below.
(CH3)2N2H2(l) + N2O4(l)--> N2(g) + H2O(g) + CO2(g)
(CH3)2N2H2(l) + N2O4(l)--> N2(g) + H2O(g) + CO2(g)
a)
1,2,3,4,2
b)
1,3,5,7,9
c)
1,2,3,4,5
d)
2,4,1,6,2
20.
What is Avogadro's number?
a)
6.02×1023
b)
6.02×1024
c)
6.02×1027
d)
6.02×1020
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