Question 1

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 2

The theoretical yield is the amount of each reactant needed in order to make the maximum amount of product.

Accepted Answer

A) True 
 B)False

Question 3

Iron metal reacts with oxygen to produce iron(III)oxide.If you have 12.0 moles of iron for complete reaction,you need

Accepted Answer

A) 9.0 moles of O2 and produce 3.0 moles of Fe2O3. 
B) 12.0 moles of O2 and produce 24.0 moles of Fe2O3. 
C) 9.0 moles of O2 and produce 6.0 moles of Fe2O3. 
D) 4.5 moles of O2 and produce 3.0 moles of Fe2O3. 
E) none of the above

Question 4

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 5

How many grams of water are made from the reaction of 16.0 grams of oxygen gas?
Given the reaction: 2H2 + O2 → 2H2O

Accepted Answer

A) 18 
B) 9 
C) 36 
D) 16 
E) not enough information

Question 6

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas?
Given the reaction: 2H2 + O2 → 2H2O

Accepted Answer

A) 18 
B) 72 
C) 36 
D) 4.5 
E) not enough information

Question 7

Thermal energy flows into the reaction and out of the surroundings in an endothermic reaction.

Accepted Answer

A) True 
 B)False

Question 8

Consider the following generic chemical equation: 2W + 3X → 3Y + Z
When 5 units of W and 6 units of X are allowed to react,the limiting reactant would be:

Accepted Answer

A) W 
B) X 
C) Y 
D) Z 
E) There is no limiting reactant in this situation.

Question 9

The enthalpy of reaction,△H rxn,is the amount of thermal energy that flows when a reaction occurs at constant temperature.

Accepted Answer

A) True 
 B)False

Question 10

If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.How many grams were actually produced?

Accepted Answer

A) 5400 
B) 56 
C) 32 
D) 1.8 
E) none of the above

Question 11

If the theoretical yield of the reaction below corresponds to 99.2 g 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

The limiting reactant is the product that is completely consumed in a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 13

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen.
2H2 + O2 → 2H2O
The limiting reagent is the oxygen.

Accepted Answer

A) True 
 B)False

Question 14

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 15

How many moles of calcium chloride are theoretically produced 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) 0.7 
B) 1.0 
C) 1.4 
D) 1.3 
E) not enough information

Question 16

How many moles of H2 can be made from complete reaction of 3.0 moles of Al?
Given: 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Accepted Answer

A) 3 moles 
B) 3.0 moles 
C) 4.5 moles 
D) 9.0 moles 
E) none of the above

Question 17

Given the balanced equation CH4 + 2 O2 → CO2 + 2 H2O,which of the following is NOT a correct conversion factor?

Accepted Answer

A) 2 mole H2O = 18.02 g 
B) 1 mole O2 = 32.00 g 
C) 1 mole CH4  2 mole H2O 
D) 2 mole O2  1 mole CO2 
E) none of the above

Question 18

Calculate the maximum number of grams of NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g H2.
Reaction: N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A) 0.964 
B) 2.43 
C) 4.00 
D) 17.0 
E) none of the above

Question 19

How many eggs are needed to make 1 dozen waffles,assuming you have enough of all other ingredients?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A) 48 
B) 9 
C) 12 
D) 16 
E) not enough information

Question 20

How many waffles can be made from 1 dozen eggs,assuming you have enough of all other ingredients?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A) 48 
B) 12 
C) 4 
D) 16 
E) not enough information

Exam 8: Quantities in Chemical Reactions

Which of the following statements is false?

The theoretical yield is the amount of each reactant needed in order to make the maximum amount of product.

Iron metal reacts with oxygen to produce iron(III) oxide.If you have 12.0 moles of iron for complete reaction,you need

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

How many grams of water are made from the reaction of 16.0 grams of oxygen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

Thermal energy flows into the reaction and out of the surroundings in an endothermic reaction.

Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react,the limiting reactant would be:

The enthalpy of reaction,△H _rxn,is the amount of thermal energy that flows when a reaction occurs at constant temperature.

If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.How many grams were actually produced?

If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g,calculate the percent yield. Given: Li₂O + H₂O → 2 LiOH

The limiting reactant is the product that is completely consumed in a chemical reaction.

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The limiting reagent is the oxygen.

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

How many moles of calcium chloride are theoretically produced 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

How many moles of H₂ can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Given the balanced equation CH₄ + 2 O₂ → CO₂ + 2 H₂O,which of the following is NOT a correct conversion factor?

Calculate the maximum number of grams of NH₃ that can be produced by the reaction of 2.00 g of N₂ with 3.00 g H₂. Reaction: N₂(g) + 3 H₂(g) → 2 NH₃(g)

How many eggs are needed to make 1 dozen waffles,assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many waffles can be made from 1 dozen eggs,assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Exam 8: Quantities in Chemical Reactions

Which of the following statements is false?

The theoretical yield is the amount of each reactant needed in order to make the maximum amount of product.

Iron metal reacts with oxygen to produce iron(III) oxide.If you have 12.0 moles of iron for complete reaction,you need

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

How many grams of water are made from the reaction of 16.0 grams of oxygen gas? Given the reaction: 2H2 + O2 → 2H2O

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction: 2H2 + O2 → 2H2O

Thermal energy flows into the reaction and out of the surroundings in an endothermic reaction.

Consider the following generic chemical equation: 2W + 3X → 3Y + Z When 5 units of W and 6 units of X are allowed to react,the limiting reactant would be:

The enthalpy of reaction,△H rxn,is the amount of thermal energy that flows when a reaction occurs at constant temperature.

If the theoretical yield of a reaction is 42.0 grams of product and the percent yield is 75%.How many grams were actually produced?

If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g,calculate the percent yield. Given: Li2O + H2O → 2 LiOH

The limiting reactant is the product that is completely consumed in a chemical reaction.

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The limiting reagent is the oxygen.

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

How many moles of calcium chloride are theoretically produced 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

How many moles of H2 can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Given the balanced equation CH4 + 2 O2 → CO2 + 2 H2O,which of the following is NOT a correct conversion factor?

Calculate the maximum number of grams of NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g H2. Reaction: N2(g) + 3 H2(g) → 2 NH3(g)

How many eggs are needed to make 1 dozen waffles,assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many waffles can be made from 1 dozen eggs,assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

How many grams of water are made from the reaction of 16.0 grams of oxygen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction: 2H₂ + O₂ → 2H₂O

The enthalpy of reaction,△H _rxn,is the amount of thermal energy that flows when a reaction occurs at constant temperature.

If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g,calculate the percent yield. Given: Li₂O + H₂O → 2 LiOH

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The limiting reagent is the oxygen.

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

How many moles of calcium chloride are theoretically produced 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

How many moles of H₂ can be made from complete reaction of 3.0 moles of Al? Given: 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Given the balanced equation CH₄ + 2 O₂ → CO₂ + 2 H₂O,which of the following is NOT a correct conversion factor?

Calculate the maximum number of grams of NH₃ that can be produced by the reaction of 2.00 g of N₂ with 3.00 g H₂. Reaction: N₂(g) + 3 H₂(g) → 2 NH₃(g)