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Chemistry Stoichiometry Review

Total questions: 12

Worksheet time: 57mins

Name
Class
Date
1.
2H2  +   O2  →  2H2O
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?
a)
6.7 mol
b)
1.0 mol
c)

10.05 mol

d)
4.5 mol
4.

2Na + 2H2O → 2NaOH+ H2 How many grams of hydrogen are produced if

120 g of Na are available?

a)

5.27 g

b)

2.63 g

c)

690 g

d)

45 g

5.

Stoichiometry is -

a)

a balanced reaction with the same number of elements on both sides of the reaction

b)

Calculating moles

c)

using the balanced reaction and moles to calculate amounts needed and used

d)

percentage yield

6.

What are the coefficients to balance the following:

Fe + CuCl2 --> Cu + FeCl3

a)

1,1,1,1

b)

2,3,3,2

c)

3,2,3,2

d)

4,6,6,4

7.

What is the mole ratio of HCl to CaCl2 in this reaction:

Ca(OH)2 + 2 HCl --> CaCl2 + 2 H2O

a)

2:2

b)

1:1

c)

1:2

d)

2:1

8.
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
9.
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
10.
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
11.

 To make a sandwich you need:

2 slices of bread + 1 lunchmeat --> 1 sandwich

How many sandwiches can be made with

8 slices of bread and 8 slices of meat?

a)

4 sandwiches

with 4 slices of meat left over

b)

2 sandwiches with bread and lunchmeat left over

c)

6 sandwiches with nothing left over

12.
2H2   +   O2  →  2H2O
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