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WorksheetsLIMITING REACTANT & PERCENTAGE YIELD
Total questions: 25
Worksheet time: 56mins
The limiting reactant is the reactant that __________ .
slows down the reaction
used up first
left over at the end of reaction
controls the speed of the reaction
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
17.7%
117.7%
84.9%
15.1%
What is a limiting reactant?
The reactant that determines how much product can be made
The reactant that is in excess
The product that you can make the most of
The amount of reactants that react with each other
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of starwberry jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 15 tablespoons of jelly, what is the limiting reactant?
bread
strawberry jelly
peanut butter
How many moles of water can be produced if 8 moles H2 are used?
This is what you call a reactant that you have enough of. The one that DOES NOT run out.
Limiting Reactant
Excess Reactant
Highly Reactant
Super Reactant
1 Body + 4 Tires → 1 Car
How many cars can you make with 92 tires and 34 bodies?
23
34
68
46
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
theoretical yield
limiting reactant
actual yield
percentage yield
excess reactant
In a lab, a scientist calculated 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?
82.1%
22.8%
18.7%
12.2%
In a balanced equation, the ratio between the coefficient of any two substances is called the _______.
mole ratio
stoichiometry
limiting reactant
excess reactant
Calculate the theoretical yield if given the actual yield and percent yield are 51.4g and 77.0% respectively.
25.6g
1.5g
15g
66.8g
What is the actual yield?
the maximum amount of product from a reaction
the amount of product recovered from a lab experiment
amount of product that causes the reaction to stop
the amount of product needed to reverse the reaction
Some product may be lost during filtering causing your actual yield to be less than your theoretical yield.
true
false
In the image, which reactant is limiting?
The white molecules, because there are extra.
The black atoms, because they are completely used up.
The white molecules, because they are completely used up.
The black atoms, because there are extra.
If a chemist calculates the maximum amount of product that could be obtained from a chemical reaction, he or she is calculating the
Theoretical yield
Mole ratio
Actual yield
Percentage yield
What is the measured amount of a product obtained from a chemical reaction?
Mole ratio
Theoretical yield
Percentage yield
Actual yield
In a lab, a scientist calculated 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?
82.1%
0.82%
10.1%
122%
A chemist interested in the efficiency of a chemical reaction would calculate the
Mole ratio
Rate of reaction
Percent yield
Energy released
What is an excess reactant?
Substance you end with
Substance that determines the rate of reaction
Substance that is not used up completely
Substance that is used up completely
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
90.4%
104%
96.15%
1.04%
Reactant and products might adhere to containers causing actual yield to be less than theoretical yield.
true
false
Percent yield=(________)÷(________)×100%
