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WorksheetsStoichiometry Quick Review
Total questions: 10
Worksheet time: 9mins
Name
Class
Date
1.
In the reaction represented by the equation N2 + 3H2 --> 2NH3, what is the mole ratio of nitrogen to ammonia?
a)
1:1
b)
1:2
c)
1:3
d)
2:3
2.
The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) --> 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
a)
1.0 mol
b)
2.0 mol
c)
3.0 mol
d)
6.0 mol
3.
For the reaction represented by the equation
2Na + 2H2O --> 2NaOH + H2, how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?
2Na + 2H2O --> 2NaOH + H2, how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?
a)
4.5 g
b)
45 g
c)
80. g
d)
200. g
4.
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
5.
For the reaction represented by the equation Cl2 + 2KBr --> 2KCl + Br2, calculate the percentage yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine.
a)
73.4%
b)
82.1%
c)
91.0%
d)
98.9%
6.
Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
a)
qualitative analysis
b)
stoichiometry
c)
entropy
d)
chemical kinetics
7.
In a chemical reaction
a)
the mass of the reactants equals the mass of the products.
b)
the mass of the products is greater than the mass of reactants.
c)
the number of atoms in the reactants and products must change.
d)
energy as heat must be added to the reactants.
8.
Which observation does not indicate that a chemical reaction has occurred?
a)
formation of a precipitate
b)
production of a gas
c)
evolution of heat and light
d)
change in total mass of substances
9.
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
a)
oxygen
b)
O
c)
O2
d)
O3
10.
When the equation Fe3O4 + Al --> Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
a)
3
b)
4
c)
6
d)
9
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