Question 1

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen.
2H2 + O2 → 2H2O
The theoretical yield of the reaction is 4 grams of water.

Accepted Answer

A) True 
 B)False

Question 2

Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO2 and
99.9 g KOH?
Reaction: CO2 + 2KOH → K2CO3 + H2O

Accepted Answer

A) K2CO3 
B) H2O 
C) CO2 
D) KOH 
E) not enough information

Question 3

Consider the reaction: 2 Al + 3Br2 → 2 AlBr3
Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

Accepted Answer

A) 1.0 mole Al;0 mole Br2;4.0 mole AlBr3 
B) 0 mole Al;0 mole Br2;11.0 mole AlBr3 
C) 2.0 mole Al;3.0 mole Br2;2.0 mole AlBr3 
D) 0 mole Al;1.0 mole Br2;4.0 mole AlBr3 
E) none of the above

Question 4

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 5

How many grams of chlorine gas are needed to make 117 grams of sodium chloride?
Given the reaction: 2Na + Cl2 → 2NaCl

Accepted Answer

A) 71.0 
B) 142 
C) 35.5 
D) 48.2 
E) not enough information

Question 6

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins
If you have 5 cups of flour,3 eggs and plenty of blueberries,the limiting reactant is the eggs.

Accepted Answer

A) True 
 B)False

Question 7

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 8

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

Accepted Answer

A) True 
 B)False

Question 9

The percent yield can never be greater than 100%.

Accepted Answer

A) True 
 B)False

Question 10

An exothermic reaction has a negative enthalpy of reaction.

Accepted Answer

A) True 
 B)False

Question 11

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 12

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 13

Greenhouse gases affect the temperature of the earth by blocking sunlight from reaching earth.

Accepted Answer

A) True 
 B)False

Question 14

The reaction for the oxidation of NH3 is given as:
4 NH3 + 5 O2 → 4 NO + 6 H2O
Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO?

Accepted Answer

A) 134 
B) 237 
C) 21.0 
D) 2.37 
E) none of the above

Question 15

What is the excess 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 16

The primary greenhouse gas is carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 17

How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2?
Reaction: 4Al + 3O2 → 2Al2O3

Accepted Answer

A) 8.90 
B) 10.1 
C) 1.1 
D) 14.6 
E) not enough information

Question 18

Given the reaction: 2 Na(s)+ Cl2(g)→ 2 NaCl(s)
The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl2 ≡ 2 mol NaCl

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Which ingredient is the limiting reactant 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) flour 
B) eggs 
C) oil 
D) waffles 
E) not enough information

Exam 8: Quantities in Chemical Reactions

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The theoretical yield of the reaction is 4 grams of water.

Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO₂ and 99.9 g KOH? Reaction: CO₂ + 2KOH→ K₂CO₃ + H₂O

Consider the reaction: 2 Al + 3Br₂ → 2 AlBr₃ Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br₂.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

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 chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins If you have 5 cups of flour,3 eggs and plenty of blueberries,the limiting reactant is the eggs.

Which of the below statements about global warming is FALSE?

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

The percent yield can never be greater than 100%.

An exothermic reaction has a negative enthalpy of reaction.

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?

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

Greenhouse gases affect the temperature of the earth by blocking sunlight from reaching earth.

The reaction for the oxidation of NH₃ is given as: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH₃must be made to react with excess oxygen to yield 70.5 g of NO?

What is the excess 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

The primary greenhouse gas is carbon dioxide.

How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Given the reaction: 2 Na(s)+ Cl₂(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl₂≡ 2 mol NaCl

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

Which ingredient is the limiting reactant 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

Exam 8: Quantities in Chemical Reactions

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H2 + O2 → 2H2O The theoretical yield of the reaction is 4 grams of water.

Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO2 and 99.9 g KOH? Reaction: CO2 + 2KOH → K2CO3 + H2O

Consider the reaction: 2 Al + 3Br2 → 2 AlBr3 Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

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 chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

Given the recipe: 2 cups flour + 1 egg + 3 oz blueberries → 4 muffins If you have 5 cups of flour,3 eggs and plenty of blueberries,the limiting reactant is the eggs.

Which of the below statements about global warming is FALSE?

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

The percent yield can never be greater than 100%.

An exothermic reaction has a negative enthalpy of reaction.

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?

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

Greenhouse gases affect the temperature of the earth by blocking sunlight from reaching earth.

The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 → 4 NO + 6 H2O Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH3 must be made to react with excess oxygen to yield 70.5 g of NO?

What is the excess 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

The primary greenhouse gas is carbon dioxide.

How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3

Given the reaction: 2 Na(s)+ Cl2(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl2 ≡ 2 mol NaCl

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

Which ingredient is the limiting reactant 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

For the following reaction you have 8 grams of hydrogen and 2 grams of oxygen. 2H₂ + O₂ → 2H₂O The theoretical yield of the reaction is 4 grams of water.

Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO₂ and 99.9 g KOH? Reaction: CO₂ + 2KOH→ K₂CO₃ + H₂O

Consider the reaction: 2 Al + 3Br₂ → 2 AlBr₃ Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br₂.What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

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 chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl₂ → 2NaCl

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?

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 reaction for the oxidation of NH₃ is given as: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O Under certain conditions the reaction will proceed at 29.8% yield of NO.How many grams of NH₃must be made to react with excess oxygen to yield 70.5 g of NO?

What is the excess 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

How many grams of the excess reactant are left over according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O₂? Reaction: 4Al + 3O₂ → 2Al₂O₃

Given the reaction: 2 Na(s)+ Cl₂(g)→ 2 NaCl(s) The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl₂≡ 2 mol NaCl