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Stoichiometry Mini-Review

Total questions: 32

Worksheet time: 2hrs 36mins

Name
Class
Date
1.
2CO  +  O2  −-> 2CO2
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
a)
10
b)
20
c)
1
d)
5
2.
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
a)
82%
b)
0.82%
c)
10.1 %
d)
100%
3.

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

a)

10/6

b)

3/4

c)

4/3

d)

2/3

4.

What is the molar mass of table salt (NaCl)?

a)

116.89 g/mol

b)

35.45 g/mol

c)

22.99 g/mol

d)

58.44 g/mol

5.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
6.
How many moles are in 19.82 g Mg? 
a)
1.226mol Mg
b)
481.7mol Mg
c)
1.000mol Mg
d)
 0.82 mol Mg
7.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
8.
1 mole of any gas at STP has a volume of ______________________. 
a)
22.4 liters
b)
44.2 liters
c)
6.02 x 1023 liters
d)
2.4 liters
9.
Balance this reaction: ____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
a)
1,1,1,1
b)
1,2,1,1
c)
2,1,1,2
d)
2,1,2,1
10.

In a chemical reaction, the mass of reactants ___.

a)

is less than the mass of products

b)

is greater than the mass of products

c)

has no relationship to the mass of products

d)

is equal to the mass of products

11.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
12.
 The equation for Percent Yield:
a)
(predicted/experimental) X 100
b)
(experimental/predicted) X 100
c)
(experimental - predicted)/ Predicted X 100
13.
True or False. You must convert grams to moles to do stoichiometry.
a)
True
b)
False
14.
What is a Limiting Reagent?
a)
speeds up a reaction
b)
what you run out of first
c)
what you have left over
d)
slows down a reaction
15.
What is a Excess Reagent?
a)
amount you end with
b)
what you run out of first
c)
what you have left over
d)
what you start with
16.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
17.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
18.
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
19.
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
20.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
21.
9. Complete the equation for the percent yield of a chemical reaction:
Percent yield=(________)÷(________)×100%
a)
actual yield; theoretical yield
b)
theoretical yield; actual yield
22.

Mole Ratios used for conversions are derived from:

a)

the molar mass of the reactants in the balanced chemical equation

b)

the coefficients of the balanced chemical equation

c)

the subscripts of the products in the balanced chemical equation

d)

the group number of each element in the balanced chemical equation

23.

What is the mole ratio of Ba(OH)2 to AlPO4?

AlPO4 + Ba(OH)2 → Al(OH)3 + Ba3(PO4)2

a)

3 mol Ba(OH)2 / 2 mol AlPO4

b)

1 mol Ba(OH)2/ 1 mol AlPO4

c)

2 mol Ba(OH)2/ 3 mol AlPO4

d)

1 mol Ba(OH)2/ 3 mol AlPO4

24.

What is the mole ratio of Mg to MgCl2?

Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)

a)

2 mol Mg/ 1 mol MgCl2

b)

1 mol Mg/ 2 mol MgCl2

c)

1 mol Mg/ 1 mol MgCl2

d)

2 mol Mg/ 2 mol MgCl2

25.

If there are 2 moles of oxygen available, which mole ratio will tells how much water is produced?


C3H8 +5O2 → 3CO2 + 4H2O

a)

4 mol H2O/ 5 mol O2

b)

5 mol O2/ 4 mol H2O

c)

2 mol O2/ 4 mol H2O

d)

4 mol O2/ 2 mol H2O

26.

If there are 10 moles of propane, C3H8, which mole ratio will tells how much oxygen is required for the reaction to take place?


C3H8 + 5O2 → 3CO2 + 4H2O

a)

1 mol C3H8/ 5 mol O2

b)

5 mol O2/ 1 mol C3H8

c)

5 mol O2/ 10 mol C3H8

d)

10 mol C3H8/ 5 mol O2

27.

Which mole ratio tells how much aluminum oxide is produced from 3 moles of aluminum?


4Al + 3O2 → 2Al2O3

a)

3 mol Al/ 2 mol Al2O3

b)

2 mol Al2O3/ 4 mol Al

c)

4 mol Al/ 2 mol Al2O3

d)

2 mol Al2O3/ 3 mol Al

28.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

a)
b)
c)
d)
29.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?

a)
b)
c)
d)
30.
What can be determined from a balanced chemical equation?
a)
Mole ratio of any two substances in the reaction
b)
Energy released in the reaction.
c)
Electron configuration of all elements in the reaction. 
d)
Mechanism involved in the reaction. 
31.
If there are 5 boys and 7 girls, write the ratio of girls to boys.
a)
5 to 7
b)
7 to 5
c)
5 to 12
d)
7 to 12
32.

What is the ratio of red apples to green apples

a)

7 apples to 3 green

b)

4 red apples to 7 apples

c)

4 red apples to 3 green apples

d)

3 green apples to 4 red apples

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