Question 1

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

Question 2

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Accepted Answer

A) 10 
B) 12 
C) 6 
D) 4 
E) not enough information

Question 3

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins.
You can make 1 dozen muffins from 3 eggs.

Accepted Answer

A) True 
 B)False

Question 4

How many moles of aluminum oxide are produced according to 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) 0.396 
B) 0.185 
C) 0.741 
D) 5.00 
E) not enough information

Question 5

How many grams of water 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) 25.2 
B) 50.4 
C) 46.8 
D) 103.6 
E) not enough information

Question 6

What is the limiting 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 7

Which is the limiting 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 8

Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B,which statement is TRUE?

Accepted Answer

A) Substance A will be the limiting reactant. 
B) Substance B will be the limiting reactant. 
C) There is just enough of A and B so that everything reacts completely. 
D) Substance C cannot be formed from this reaction. 
E) none of the above

Question 9

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 
2Na + Cl2 → 2NaCl

Accepted Answer

A) 46.0 
B) 5.75 
C) 23.0 
D) 11.5 
E) not enough information

Question 10

The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings.Which of the following is TRUE?

Accepted Answer

A) This reaction is exothermic. 
B) This reaction has a negative enthalpy of reaction. 
C) Complete reaction of two moles of nitrogen gas would release 184 kJ of thermal energy in this reaction. 
D) All of the above are true. 
E) None of the above are true.

Question 11

Suppose two chemical reactions are linked together in a way that the O2 produced in the first reaction goes on to react completely with Mg to form MgO in the second reaction. Reaction one: 
2 KClO3 → 3 O2 + 2 KCl
Reaction two: 2 Mg + O2 → 2 MgO
If you start with 4 moles of KClO3,how many moles of MgO could eventually form?

Accepted Answer

A) 2 moles 
B) 4 moles 
C) 6 moles 
D) 12 moles 
E) none of the above

Question 12

Which of the below statements about global warming is FALSE?

Accepted Answer

A) Some greenhouses gases are needed to keep the proper temperature balance. 
B) Greenhouse gases prevent heat from leaving the earth. 
C) Greenhouse gases allow sunlight to reach and heat the earth. 
D) If the level of greenhouse gases increases,the temperature will decrease. 
E) none of the above

Question 13

The percent yield can never be greater than 100%.

Accepted Answer

A) True 
 B)False

Question 14

The primary source for the rising carbon dioxide levels is respiration of the Earth's growing population.

Accepted Answer

A) True 
 B)False

Question 15

The actual yield is the amount of product actually produced by a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 16

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 17

Before determining conversion factors,it is necessary to make sure the equation is properly balanced.

Accepted Answer

A) True 
 B)False

Question 18

Hydrochloric acid reacts with barium hydroxide according to the equation:  Calculate the heat (in kJ)associated with the complete reaction of 18.2 grams of HCl (aq).

Accepted Answer

A) -58.9 
B) +58.9 
C) -29.5 
D) -236 
E) none of the above

Question 19

What is the limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO2? 
Reaction: C + SiO2 → SiC + O2

Accepted Answer

A) C 
B) SiO2 
C) SiC 
D) O2 
E) There is no limiting reactant.

Question 20

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

Exam 8: Quantities in Chemical Reactions

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

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 1 dozen muffins from 3 eggs.

How many moles of aluminum oxide are produced according to 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 grams of water 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

What is the limiting 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

Which is the limiting 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

Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B,which statement is TRUE?

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings.Which of the following is TRUE?

Which of the below statements about global warming is FALSE?

The percent yield can never be greater than 100%.

The primary source for the rising carbon dioxide levels is respiration of the Earth's growing population.

The actual yield is the amount of product actually produced by a chemical reaction.

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

Before determining conversion factors,it is necessary to make sure the equation is properly balanced.

Hydrochloric acid reacts with barium hydroxide according to the equation: Calculate the heat (in kJ) associated with the complete reaction of 18.2 grams of HCl (aq) .

What is the limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO₂? Reaction: C + SiO₂ → SiC + O₂

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

Exam 8: Quantities in Chemical Reactions

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

What is the theoretical yield of waffles if you have 5 cups of flour,9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins. You can make 1 dozen muffins from 3 eggs.

How many moles of aluminum oxide are produced according to 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 grams of water 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

What is the limiting 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

Which is the limiting 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

Consider the following generic chemical equation: 2A + 5B → C + 3D If you react 4 units of A with 10 units of B,which statement is TRUE?

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

The reaction of one mole of nitrogen gas with three moles of hydrogen gas releases 92 kJ of thermal energy to the surroundings.Which of the following is TRUE?

Which of the below statements about global warming is FALSE?

The percent yield can never be greater than 100%.

The primary source for the rising carbon dioxide levels is respiration of the Earth's growing population.

The actual yield is the amount of product actually produced by a chemical reaction.

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

Before determining conversion factors,it is necessary to make sure the equation is properly balanced.

Hydrochloric acid reacts with barium hydroxide according to the equation: Calculate the heat (in kJ) associated with the complete reaction of 18.2 grams of HCl (aq) .

What is the limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO2? Reaction: C + SiO2 → SiC + O2

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 moles of aluminum oxide are produced according to 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 grams of water 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

What is the limiting 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

Which is the limiting 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 grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

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

What is the limiting reactant for the reaction below given that you start with 2.50 grams C and 2.50 grams SiO₂? Reaction: C + SiO₂ → SiC + O₂

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