Question 1

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 2

Many metals react with halogens to give metal halides.For example,
2 Al (s)+ 3 Cl2(g)→ 2 AlCl3 (s)
If you begin with 13.5 g of aluminum:

Accepted Answer

A) you will need 23.6 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. 
B) you will need 53.2 g Cl2 for complete reaction and will produce 66.7 g of AlCl3. 
C) you will need 26.6 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. 
D) you will need 11.8 g Cl2 for complete reaction and will produce 49.0 g of AlCl3. 
E) none of the above

Question 3

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4?
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2

Accepted Answer

A) Ca(NO3)2  
B) Li3PO4 
C) LiNO3 
D) Ca3(PO4)2 
E) not enough information

Question 4

The percent yield is calculated by dividing the actual yield by the theoretical yield times 100.

Accepted Answer

A) True 
 B)False

Question 5

The limiting reactant is not necessarily the reactant with the least mass.

Accepted Answer

A) True 
 B)False

Question 6

The conversion factor between mass and moles for a compound is the molar mass.

Accepted Answer

A) True 
 B)False

Question 7

A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3
If only 14.0 g of N2 is available,what is the minimum amount,in grams,of H2 needed to completely react with this quantity of N2?

Accepted Answer

A) 1.01 g 
B) 1.51 g 
C) 3.03 g 
D) 6.06 g 
E) none of the above

Question 8

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 9

What is the theoretical yield in grams of CuS for the following reaction given that you start with 
Of Na2S and 
CuSO4?
Reaction: Na2S + CuSO4 → Na2SO4 + CuS

Accepted Answer

A) 0.0758 
B) 0.198 
C) 18.93 
D) 7.25 
E) not enough information

Question 10

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 11

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4?
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2

Accepted Answer

A) 7.2 
B) 6.8 
C) 1.2 
D) 1.1 
E) not enough information

Question 12

Starting with 156 g 
O and 33.3 g 
O,decide which reactant is present in limiting quantities.
Given: 
O + 
O → 2 LiOH

Accepted Answer

A) lithium oxide 
B) water 
C) lithium hydroxide 
D) insufficient data 
E) none of the above

Question 13

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 14

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 15

Given the chemical equation: 2 Ca + O2 → 2 CaO,
if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted.

Accepted Answer

A) True 
 B)False

Question 16

A balanced chemical equation used to prepare ammonium carbonate, (NH4)2CO3 ,is: 
Which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed?

Accepted Answer

A) React 2 moles NH3 ,1 mole CO2 ,and 1 mole H2O 
B) React 2 moles NH3 ,8 moles CO2 ,and 8 moles H2O 
C) React 4 moles NH3 ,1 mole CO2 ,and 2 moles H2O 
D) React 4 moles NH3 ,2 moles CO2 ,and 2 moles H2O 
E) none of the above

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

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

Question 19

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 20

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

Accepted Answer

A) True 
 B)False

Exam 8: Quantities in Chemical Reactions

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

Many metals react with halogens to give metal halides.For example, 2 Al (s) + 3 Cl₂(g) → 2 AlCl₃(s) If you begin with 13.5 g of aluminum:

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO₃) ₂and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

The percent yield is calculated by dividing the actual yield by the theoretical yield times 100.

The limiting reactant is not necessarily the reactant with the least mass.

The conversion factor between mass and moles for a compound is the molar mass.

A chemist wishes to perform the following reaction: N₂ + 3 H₂ → 2 NH₃ If only 14.0 g of N₂ is available,what is the minimum amount,in grams,of H₂ needed to completely react with this quantity of N₂?

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?

What is the theoretical yield in grams of CuS for the following reaction given that you start with Of Na₂S and CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

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 moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

Starting with 156 g O and 33.3 g O,decide which reactant is present in limiting quantities. Given: O + O → 2 LiOH

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

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 chemical equation: 2 Ca + O₂ → 2 CaO, if 2 moles of CaO are formed in this reaction,then 2 moles of O₂ must have reacted.

A balanced chemical equation used to prepare ammonium carbonate, (NH₄) ₂CO₃,is: Which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed?

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

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

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

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

Exam 8: Quantities in Chemical Reactions

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

Many metals react with halogens to give metal halides.For example, 2 Al (s) + 3 Cl2(g) → 2 AlCl3 (s) If you begin with 13.5 g of aluminum:

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3) 2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

The percent yield is calculated by dividing the actual yield by the theoretical yield times 100.

The limiting reactant is not necessarily the reactant with the least mass.

The conversion factor between mass and moles for a compound is the molar mass.

A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available,what is the minimum amount,in grams,of H2 needed to completely react with this quantity of N2?

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?

What is the theoretical yield in grams of CuS for the following reaction given that you start with Of Na2S and CuSO4? Reaction: Na2S + CuSO4 → Na2SO4 + CuS

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 moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3) 2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3) 2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4) 2

Starting with 156 g O and 33.3 g O,decide which reactant is present in limiting quantities. Given: O + O → 2 LiOH

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

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 chemical equation: 2 Ca + O2 → 2 CaO, if 2 moles of CaO are formed in this reaction,then 2 moles of O2 must have reacted.

A balanced chemical equation used to prepare ammonium carbonate, (NH4) 2CO3 ,is: Which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed?

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

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

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

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

Many metals react with halogens to give metal halides.For example, 2 Al (s) + 3 Cl₂(g) → 2 AlCl₃(s) If you begin with 13.5 g of aluminum:

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO₃) ₂and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

A chemist wishes to perform the following reaction: N₂ + 3 H₂ → 2 NH₃ If only 14.0 g of N₂ is available,what is the minimum amount,in grams,of H₂ needed to completely react with this quantity of N₂?

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?

What is the theoretical yield in grams of CuS for the following reaction given that you start with Of Na₂S and CuSO₄? Reaction: Na₂S + CuSO₄→ Na₂SO₄ + CuS

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 moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO₃) ₂ and 2.4 moles of Li₃PO₄? Reaction: 3Ca(NO₃) ₂+ 2Li₃PO₄→ 6LiNO₃ + Ca₃(PO₄) ₂

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

Given the chemical equation: 2 Ca + O₂ → 2 CaO, if 2 moles of CaO are formed in this reaction,then 2 moles of O₂ must have reacted.

A balanced chemical equation used to prepare ammonium carbonate, (NH₄) ₂CO₃,is: Which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed?

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

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