Free Printable Limited Reagent

Worksheets

Limited Reagent

Total questions: 20

Worksheet time: 1hrs 23mins

Name

Class

Date

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?

bread

jelly

peanut butter

sandwich

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl₂.

1 Mg + 2 HCl --> 1 MgCl₂ + 1 H₂

H₂

MgCl₂

HCl

The limiting reactant . . .

slows the reaction down.

is used up first.

is the reactant that is left over.

controls the speed of the reaction.

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.

AlCl₃

Cl₂

None

When does a chemical reaction stop?

When the lab is finished.

When the excess reactant is used. up

When the limiting reactant is used up.

Chemical reactions never stop.

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

Oxygen

C₁₀H₈

Water

Carbon Dioxide

Theoretical yield = 73g

Actual yield = 62g

Calculate the percent yield.

116%

85%

1.16%

76%

3. The reactant that is not completely used up in a chemical reaction is called the __________ .

spectator reagent

limiting reagent

excess reagent

catalyst

4. If the quantities of reactants are given in units other than moles, what is the first step for determining the amount of product?

Determine the amount of product from the given amount of limiting reagent.

Convert each given quantity of reactant to moles.

Identify the limiting reagent.

10.

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.

Mg + 2HCl --> MgCl₂ + H₂

H₂

MgCl₂

HCl

11.

When you use a balanced chemical equation to calculate the amount of a product on paper it is referred to as the

experimental value

theoretical value

true amount

percent yield

12.

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?

80.6%

6.3%

24.1%

58.5%

13.

Cl₂ + 2 KBr → Br₂ + 2 KCl

How many grams of potassium chloride can be produced from 356 g of Cl₂ and 356 g of potassium bromide?

749 g

223 g

479 g

814 g

14.

Silver nitrate and sodium phosphate are reacted in equal amounts of 200 g each. How many grams of silver phosphate are produced?
3AgNO₃+ Na₃(PO₄) ---> Ag₃(PO₄) + 3NaNO₃

164 g

64 g

146 g

164 moles

15.

4NH₃+ 5O₂--> 4NO + 6H₂O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?

0.37g

0.045g

1.35g

11.1g

16.

P₄+ 6Cl₂--> 4PCl₃The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃in lab. Find the theoretical yield and calculate percent yield for the reaction.

78%

64%

27%

33%

17.

Why is it important to identify the limiting reagent?

The limiting reagent speeds up the reaction.

The limiting reagent controls the amount of product formed.

If there is no limiting reagent, the reaction will not occur.

No stoichiometry calculations can be done without a limiting reagent.

18.

0.666 g of Al reacts with 2.53 g of CuCl₂. How many grams of Al are left over after the reaction is complete?

0.328 g Al

0.338 g Al

0.666 g Al

4.98 g Al

19.

If 0.666 g Al reacts with 2.53 g CuCl₂, what is the theoretical yield of Cu?

3.21 g Cu

0.338 g Cu

1.20 g Cu

2.35 g Cu

20.

If 0.666 g Al reacts with 2.53 g CuCl₂, and 1.01 g Cu are formed in the lab, what is the percent yield of Cu?

15.8 %

84.2 %

98.4 %

100.0 %

100 %

Limited Reagent

Total questions: 20

Worksheet time: 1hrs 23mins

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