Question 1

The limiting reactant is the reactant that produces the maximum amount of product.

Accepted Answer

A) True 
 B)False

Question 2

Global warming is due to the greenhouse gases preventing heat from Earth escaping into space.

Accepted Answer

A) True 
 B)False

Question 3

How many moles of water are needed to react with 2.2 moles of Li2O? 
Given: Li2O + H2O → 2 LiOH

Accepted Answer

A)  4.4
B)  1.1
C)  1.5
D)  2.2
E)  none of the above

Question 4

Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and  12.1 g CuSO4? 
Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A)  Na2S
B)  CuSO4
C)  Na2SO4
D)  CuS
E)  not enough information

Question 5

What is the excess reactant for the reaction below given that you start with 10.0 grams of Al and  19.0  grams of O2? 
Reaction: 4Al + 3O2 → 2Al2O3

Accepted Answer

A)  Al
B)  O2
C)  Al2O3
D)  both Al and O2
E)  not enough information

Question 6

If the theoretical yield of the reaction below corresponds to 25.3 g and the percent yield of the reaction is known to be reproducibly 81.1%,calculate the actual yield. 
Given: Li2O + H2O → 2 LiOH

Accepted Answer

A)  20.5 g
B)  48.9 g
C)  45.8 g
D)  81.1 g
E)  none of the above

Question 7

The conversion factor for moles of carbon dioxide to mass of carbon dioxide is:
1 mole CO2 ≡ 44.01 g.

Accepted Answer

A) True 
 B)False

Question 8

Determine the theoretical yield of C when 3 units of A and 10 units of B are reacted in the following generic chemical equation: 2A + 5B → 4C.

Accepted Answer

A)  3
B)  4
C)  6
D)  8
E)  none of the above

Question 9

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g.What is the percent yield?

Accepted Answer

A)  75.0
B)  56.0
C)  31.5
D)  178
E)  none of the above

Question 10

Given that 4 NH3 + 5 O2 → 4 NO + 6 H2O,when 4.50 mol of H2O are formed,the amount of NO formed is:

Accepted Answer

A)  1.50 mol.
B)  3.00 mol.
C)  4.50 mol.
D)  6.75 mol.
E)  none of the above

Question 11

If the theoretical yield of the reaction below corresponds to 2O + H2O → 2 LiOH A) 16.0 % B) 71.8 % C) 38.0 % D) 61.4 % E) none of the above" class="answers-bank-image d-inline" rel="preload" > and the actual yield was 60.9 g,calculate the percent yield. 
Given: Li2O + H2O → 2 LiOH

Accepted Answer

A)  16.0 %
B)  71.8 %
C)  38.0 %
D)  61.4 %
E)  none of the above

Question 12

Which of the following statements is false?

Accepted Answer

A)  The limiting reactant is completely consumed in a chemical reaction.
B)  The theoretical yield is the amount of product that can be made based on the amount of limiting reagent.
C)  The actual yield is the amount of product actually produced by a chemical reaction.
D)  The percent yield =  × 100%.
E)  All of the above are true statements.

Question 13

How many grams of NO2 are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO3? 
Reaction: S + 6HNO3 → H2SO4 + 6NO2 + 2H2O

Accepted Answer

A)  7.20
B)  331
C)  455
D)  786
E)  not enough information

Question 14

What is the theoretical yield of waffles if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A)  10
B)  12
C)  8
D)  4
E)  not enough information

Question 15

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 2S and   CuSO4?  Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 0.05 B) 15.45 C) 9.58 D) 5.92 E) not enough information" class="answers-bank-image d-inline" rel="preload" > of Na2S and 2S and   CuSO4?  Reaction: Na2S + CuSO4 → Na2SO4 + CuS A) 0.05 B) 15.45 C) 9.58 D) 5.92 E) not enough information" class="answers-bank-image d-inline" rel="preload" > CuSO4? 
Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A)  0.05
B)  15.45
C)  9.58
D)  5.92
E)  not enough information

Question 16

Given the balanced equation CO2 + Si → SiO2 + C,if you were to react 1 mole of CO2 with 1 mole of Si,which statement is TRUE?

Accepted Answer

A)  The CO2 is the limiting reactant.
B)  The Si is the limiting reactant.
C)  The SiO2 is the limiting reactant.
D)  You have equal stoichiometric amounts of reactants.
E)  none of the above

Question 17

How many moles of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas? 
Given the reaction: 
2H2 + O2 → 2H2O

Accepted Answer

A)  4.4
B)  1.1
C)  2.2
D)  3.3
E)  not enough information

Question 18

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and  1.4  moles of Ca(OH) 2? 
Reaction: 2HCl + Ca(OH) 2 → 2H2O + CaCl2

Accepted Answer

A)  Ca(OH) 2
B)  HCl
C)  H2O
D)  CaCl2
E)  not enough information

Question 19

What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

Accepted Answer

A)  28.4
B)  22.0
C)  3.52
D)  352
E)  none of the above

Question 20

Since heat must be supplied to melt ice,the melting of ice is an endothermic process and so has a positive enthalpy value.

Accepted Answer

A) True 
 B)False

Exam 8: Quantities in Chemical Reactions

The limiting reactant is the reactant that produces the maximum amount of product.

Correct AnswerverifiedShow Answer

Determine the theoretical yield of C when 3 units of A and 10 units of B are reacted in the following generic chemical equation: 2A + 5B → 4C.

Correct AnswerverifiedShow Answer

What is the theoretical yield of waffles if you have 6 cups of flour,9 eggs and 2 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Correct AnswerverifiedShow Answer

The conversion factor for moles of carbon dioxide to mass of carbon dioxide is: 1 mole CO2 ≡ 44.01 g.

Correct AnswerverifiedShow Answer

Given that 4 NH3 + 5 O2 → 4 NO + 6 H2O,when 4.50 mol of H2O are formed,the amount of NO formed is:

Correct AnswerverifiedShow Answer

How many grams of NO2 are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO3? Reaction: S + 6HNO3 → H2SO4 + 6NO2 + 2H2O

Correct AnswerverifiedShow Answer

Which of the following statements is false?

Correct AnswerverifiedShow Answer

Given the balanced equation CO2 + Si → SiO2 + C,if you were to react 1 mole of CO2 with 1 mole of Si,which statement is TRUE?

Correct AnswerverifiedShow Answer

What is the theoretical yield of a reaction if 25.0 grams of product were actually produced from a reaction that has a 88% yield?

Correct AnswerverifiedShow Answer

Since heat must be supplied to melt ice,the melting of ice is an endothermic process and so has a positive enthalpy value.

Correct AnswerverifiedShow Answer

Which is the excess reactant in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Correct AnswerverifiedShow Answer

How many moles of water are needed to react with 2.2 moles of Li2O? Given: Li2O + H2O → 2 LiOH

Correct AnswerverifiedShow Answer

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with of Na2S and CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Correct AnswerverifiedShow Answer

What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) 2? Reaction: 2HCl + Ca(OH) 2 → 2H2O + CaCl2

Correct AnswerverifiedShow Answer

Global warming is due to the greenhouse gases preventing heat from Earth escaping into space.

Correct AnswerverifiedShow Answer

What is the excess reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3

Correct AnswerverifiedShow Answer

If the theoretical yield of the reaction below corresponds to 25.3 g and the percent yield of the reaction is known to be reproducibly 81.1%,calculate the actual yield. Given: Li2O + H2O → 2 LiOH

Correct AnswerverifiedShow Answer

How many moles of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O

Correct AnswerverifiedShow Answer

If the theoretical yield of the reaction below corresponds to and the actual yield was 60.9 g,calculate the percent yield. Given: Li2O + H2O → 2 LiOH

Correct AnswerverifiedShow Answer

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g.What is the percent yield?

Correct AnswerverifiedShow Answer

Correct Answer
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The conversion factor for moles of carbon dioxide to mass of carbon dioxide is: 1 mole CO₂ ≡ 44.01 g.

Correct Answer
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Given that 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O,when 4.50 mol of H₂O are formed,the amount of NO formed is:

Correct Answer
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How many grams of NO₂ are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO₃? Reaction: S+ 6HNO₃→ H₂SO₄ + 6NO₂ + 2H₂O

Correct Answer
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Correct Answer
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Given the balanced equation CO₂ + Si → SiO₂ + C,if you were to react 1 mole of CO₂ with 1 mole of Si,which statement is TRUE?

Correct Answer
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Which is the excess reactant in the following reaction given that you start with 15.5 g of Na₂S and 12.1 g CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

Correct Answer
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How many moles of water are needed to react with 2.2 moles of Li₂O? Given: Li₂O + H₂O → 2 LiOH

Correct Answer
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How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with of Na₂S and CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

Correct Answer
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What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH) ₂? Reaction: 2HCl + Ca(OH) ₂→ 2H₂O+ CaCl₂

Correct Answer
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Correct Answer
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What is the excess reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Correct Answer
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If the theoretical yield of the reaction below corresponds to 25.3 g and the percent yield of the reaction is known to be reproducibly 81.1%,calculate the actual yield. Given: Li₂O + H₂O → 2 LiOH

Correct Answer
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How many moles of water are made from complete reaction of 2.2 moles of oxygen gas with hydrogen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

Correct Answer
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If the theoretical yield of the reaction below corresponds to and the actual yield was 60.9 g,calculate the percent yield. Given: Li₂O + H₂O → 2 LiOH

Correct Answer
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Correct Answer
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