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Limiting Reactant Practice

Total questions: 20

Worksheet time: 26mins

Name
Class
Date
1.
What is a limiting reactant?
a)
the reactant that determines how much product can be made
b)
the reactant that is in excess
c)
the product that you can make the most of
d)
the amount of reactants that react with each other
2.
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
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.
What is the molar mass of sodium?
a)
11
b)
23
c)
45.98
d)
3
5.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Yield
6.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
d)
2
7.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
d)
there are no coefficients
8.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
9.
CH4 + 2H2O --> CO2 + 4H2
What is the limiting reactant when 20g CH4 react with 15g H2O?
a)
CH4
b)
H2O
c)
CO2
d)
H2
10.
Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?
a)
Fe
b)
S
c)
FeS
d)
none 
11.

Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 2 moles of aluminum and 3 moles of chlorine are reacted, how much AlCl3 can be made?

a)

1 mole

b)

2 moles

c)

4 moles

d)

0 moles

12.

How much water can be made if 8 moles of NH3 react with 6 moles of NO?

4NH3+6NO --> 5N2 + 6H2O

a)

5 moles

b)

6 moles

c)

12 moles

d)

18 moles

13.

P4 + 3O2 --> P4O6

How many moles of P4O6 can be made if 3 moles of P4 react with 6 moles of O2?

a)

1 mole

b)

2 moles

c)

4 moles

d)

0 moles

14.
P4 + 3O2 --> P4O6 
What is the limiting reactant is 12 moles of P4 react with 15 moles of O2?
a)
P4
b)
O2
c)
P4O6 
d)
none of the above
15.
What is the limiting reactant if 10 moles of NH3  react  with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
16.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
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.
Al + HBr --> AlBr3 + H2
Balance the following equation. What is the coefficient for HBr?
a)
2
b)
6
c)
3
d)
1
19.

Identify the limiting and excess reactants in the reaction shown.

a)

N2 is limiting and H2 is excess. 

b)

H2 is limiting and N2 is excess. 

c)

NH3 is both limiting and excess.

d)

There is no limiting reactant. 

20.

Hydrogen and oxygen molecules combine to form water molecules as shown in the reaction below. Given the molecules provided, which of the following is true about the products of this reaction? 

a)

2 H2O molecules are produced, O2 is the limiting reactant

b)

4 H2O molecules are produced, H2 is the limiting reactant

c)

4 H2O molecules are produced, O2 is the limiting reactant

d)

6 H2O molecules are produced, H2 is the limiting reactant