Question 1

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

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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 
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 4

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

Question 5

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. 
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 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Accepted Answer

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Accepted Answer

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

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

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

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?

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

Which of the following statements is false?

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

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

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

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

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

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

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

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

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

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?

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

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

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.

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

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

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Exam 8: Quantities in Chemical Reactions

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

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

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?

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

Which of the following statements is false?

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

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

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

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

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

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

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

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

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

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?

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

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

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.

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

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

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Composition

Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

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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

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?

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

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

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

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

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

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

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

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

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

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