WorksheetsUnit 8 Review
Total questions: 21
Worksheet time: 1hrs 5mins
Name
Class
Date
1.
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
How many moles of oxygen are consumed if 8 moles H2 are used?
a)
2
b)
4
c)
6
d)
8
2.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 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
3.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
4.
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
5.
SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
a)
96 g
b)
0.67 g
c)
2.67 g
d)
48 g
6.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
7.
Which of the following is not conserved in a chemical reaction?
a)
Number of grams
b)
Number of compounds
c)
Number of atoms
d)
All of them answers are correct
8.
The calculated amount of product that should ideally be produced in a chemical reaction is called the
a)
Percent yield
b)
Actual Yield
c)
Theoretical Yield
d)
Hypothetical Yield
9.
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
10.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
11.
O2 + CS2 --> CO2 + SO2
What coefficient would go in front of the O2?
What coefficient would go in front of the O2?
a)
1
b)
2
c)
3
d)
4
12.
The equation for Percent Yield:
a)
(predicted/experimental) X 100
b)
(experimental/predicted) X 100
c)
(experimental - theoretical)/ Predicted X 100
13.
True or False. You must convert grams to moles to do stoichiometry.
a)
True
b)
False
14.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
15.
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
16.
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
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.
What's the correct formula for titanium (II) nitrate?
a)
Ti(NO3)2
b)
Ti(NO3)
c)
(NO3)Ti
d)
none of the above
19.
What's the formula for iron(II) sulfide?
a)
FeS
b)
Fe2S
c)
SFe
d)
S2Fe
20.
What's the formula for silver chloride?
a)
AgCl
b)
ClAg
c)
AgCl2
d)
Cl2Ag
21.
What's the name for CuSO3?
a)
Copper Sulfate
b)
Copper Sulfite
c)
Copper (II) Sulfate
d)
Copper (II) Sulfite
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