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Stoichiometry

Total questions: 56

Worksheet time: 2hrs 39mins

Name
Class
Date
1.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
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
2.

In a lab, a scientist calculates that 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.

When 12 moles of O2 reacts with 1.1 mole of C10H8, what is the limiting reactant?  C10H8 + 12 O2 --> 10 CO2 + 4 H2O

a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
4.
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
5.
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
6.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
7.
For the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?
a)
749 g
b)
225 g
c)
479 g
d)
814 g
8.
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
9.
How many grams are in 7.8 moles of NaCl?
a)

476grams

b)

456 grams

c)

452 grams

d)

462 grams

10.
Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)
a)
1,2,2,2
b)
1,2,1,1
c)
2,1,1,1
d)
2,1,2,1
11.

11. LiOH + KCl → LiCl + KOH  b)  I actually produced 6 grams of lithium chloride and I began this reaction with 20.0 grams of lithium hydroxide. What is my percent yield?

a)

16.9%

b)

5.91%

c)

1.88%

d)

12.3%

12.
Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
a)
14.8 g
b)
12.2 g
c)
13.7 g
d)
19.9 g
13.
O2 + CS2 --> CO2 + SO2
What coefficient would go in front of the O2?
a)
1
b)
2
c)
3
d)
4
14.
WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
a)
1
b)
2
c)
3
d)
4
15.
 The equation for Percent Yield:
a)

(theoretical/experimental) X 100

b)

(experimental/theoretical) X 100

c)

(experimental - theoretical)/ theoretical X 100

16.
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
17.
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
18.
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
19.
Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
d)
Gary Busey
20.
If you predicted that 1.5 moles of Magnessium are used in a reaction, and you have 2.0 moles of Magnessium, what type of reactant is Magnessium?
a)
Limiting Reactant
b)
Excess Reactant
c)
Fast Reacter
d)
Non-Reactant
21.
The Formula to make S'mores is:
2C + 1M + G2 → C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?
a)
5
b)
4
c)
8
d)
42
22.
What is the molar mass of C6H12O6?
a)

180.18

b)

190.12

c)

185.2

d)

175.13

23.
Use the following equation:
NaIO3(aq) + 6HI(aq) --> 3I2(s) + NaI(aq) + 3H2O(l)
How many moles of iodine can be made from 6.55 moles of NaIO3?
a)
4.55 moles I2
b)
23.18 moles I2
c)
19.65 moles I2
d)
34.99 moles I2
24.
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. 
25.

I use molar mass when the problem gives me grams?

a)

False

b)

True

26.

I use 6.02 x 1023 when the problem gives me molecules?

a)

True

b)

False

27.

I use mole ratio (coefficients) from balanced chemical equation?

a)

True

b)

False

28.
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
29.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 3 moles Fe2O3 and 6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
30.
How do you determine the limiting reactant?
a)
Find the amount of product produced by each amount of reactant. The reactant that makes the most is the limiting reactant.
b)
Find the amount of product produced by each amount of reactant. The reactant that makes the least is the limiting reactant.
c)
The reactant with the least amount of mass (grams) present is the limiting reactant.
d)
Cannot be determined.
31.

P4 + 3O2 --> P4O6  What is the limiting reactant when 12 moles of P4 react with 15 moles of O2?

a)
P4
b)
O2
c)
P4O6 
d)
none of the above
32.

1 Cheese + 2 Bread --> 1 grilled cheese

How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

a)

14

b)

13

c)

26

d)

28

33.

Use the following reaction:

Mg + 2 HCl → MgCl2 + H2


What is the theoretical yield of hydrogen gas in a mixture of 15.0 g Mg and excess HCl?

a)

1.23g H2

b)

0.617g H2

34.

What is the correct name for this compound:  K3N

a)

Potassium Nitrogen

b)

Potassium Nitride

c)

Tripotassium Nitrogen

d)

Tripotassium Nitride

35.

What is the correct formula for the compound:  Aluminum Sulfide

a)

AlS

b)

Al3S2

c)

Al2S3

d)

Al+3S-2

36.

What is the correct name of this compound:  Au2O3

a)

Gold Oxide

b)

Gold (II) Oxide

c)

Gold (II) Oxide (III)

d)

Gold (III) Oxide

37.

What is the formula for this compound:  Mercury (II) Nitride

a)

HgN

b)

Hg2N3

c)

Hg3N2

d)

Hg80N14

38.

Which of the following would create an ion with a -3 charge?

a)

Nitrogen

b)

Aluminum

c)

Sulfur

d)

Potassium

39.

What is the charge of Iron in the following compound?


FeCl3

a)

+1

b)

-1

c)

+3

d)

-3

40.

What is the charge of tin in Tin (IV) Oxide?

a)

+4

b)

-4

c)

+2

d)

-2

41.

Why is it so important to specify the charge of a transition metal?

a)

Because you have to for any metal

b)

Because transition metals can make ions of different charges

c)

Because transition metals start with one charge and end with another, so you have to write both charges

d)

None of these are correct.

42.

Group 1 has a

a)

1+ charge.

b)

1- charge.

c)

has no charge at all.

43.

Balance this equation. _CH4 + _O2  → _CO2 + _H2O

a)

1,2,1,1

b)

2,1,2,1

c)

1,2,1,2

d)

0,2,0,2

44.

Which equation is correctly written and balanced?

a)

PbO2 + 2H2  → H2SO4

b)

SO2 + H20  → H2SO4

c)

2Na + 2H2O  → 2NaOH + H2

d)

2Na + 2H2O  → 2NaOH + H

45.

In a chemical formula, the total positive charge and negative charge must add up to equal _____.

a)

0

b)

1

c)

2

d)

3

46.
What is the formula for iron(II) carbonate?
a)
Fe2CO3
b)
FeCO3
c)
Fe2CO2
d)
FeCO4
47.
Ionic compounds are written with
a)
cation (+ ion) first then anion (- ion)
b)
anion (- ion) first then cation (+ ion)
c)
either way is fine
d)
polyatomic ions first
48.

Antoine Lavoisier is credited with the discovery of the law of conservation of mass. This law states that in a chemical reaction, matter is not created or destroyed,but preserved. Which of the following equations correctly models this law?

a)

A

b)

B

c)

C

d)

D

49.
Name the ionic compound SnSe2
a)
Tin diselenide
b)
Tin (IV) Selenide
c)
Tin selenide
d)
Tin (II) triselenide
50.

K+1F-1 --> These ions would have what formula?

a)

K1F1

b)

K1Ff

c)

KF

d)

All of the above

51.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
52.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
53.

In a double displacement reaction, the _________.

a)

products are always two negatives

b)

reactants are two ionic compounds (+ and -)

c)

reactants are two elements (zero charge)

d)

products are a new element and new compound

54.

What is the balanced equation that takes place between bromine and sodium iodide?

a)

Br2 + NaI --> NaBr2 + I

b)

Br2 + 2 NaI --> 2 NaBr + I2

c)

Br2 + NaI2 --> NaBrI2

d)

No reaction

55.
What will be the chemical formula for 
K and N
a)
K3N
b)
KN
c)
KN3
d)
K2N
56.

Predict the products (no need to balance): ZnS + O2 -->

a)

ZnO2 + S2

b)

Zn2O + S

c)

ZnO + S

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