Question 1

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 2

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 3

The primary greenhouse gas is carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 4

An exothermic reaction has a negative enthalpy of reaction.

Accepted Answer

A) True 
 B)False

Question 5

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 
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 6

The primary cause of increasing greenhouse gases is:

Accepted Answer

A) the burning of vast amounts of rain forests. 
B) the production of CO2 by respiration. 
C) the increased use of natural gas,petroleum and coal. 
D) the release of CO2 by decreasing solubility in the ocean. 
E) none of the above 
A) the burning of vast amounts of rain forests. 
B) the production of CO2 by respiration. 
C) the increased use of natural gas,petroleum and coal. 
D) the release of CO2 by decreasing solubility in the ocean. 
E) none of the above

Question 7

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

Question 8

In order to determine the limiting reactant in a particular reaction,one must know each of the following EXCEPT:

Accepted Answer

A) the mass of each reactant present. 
B) the molar mass of each reactant present. 
C) the coefficient of each reactant in a balanced equation. 
D) the mass of each product formed. 
A) the mass of each reactant present. 
B) the molar mass of each reactant present. 
C) the coefficient of each reactant in a balanced equation. 
D) the mass of each product formed.

Question 9

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO).The balanced chemical equation is: 
  
If 4 moles of magnesium totally reacted with more than enough O2,how many moles of MgO would be expected to form?

Accepted Answer

A) 1 mole 
B) 2 moles 
C) 4 moles 
D) 8 moles 
E) not enough information 
A) 1 mole 
B) 2 moles 
C) 4 moles 
D) 8 moles 
E) not enough information

Question 10

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 
2 Al + 6 HCl → 2 AlCl3 + 3H2

Accepted Answer

A) 2 moles 
B) 3 moles 
C) 4 moles 
D) 6 moles 
E) none of the above 
A) 2 moles 
B) 3 moles 
C) 4 moles 
D) 6 moles 
E) none of the above

Question 11

How many moles of NH3 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) 0.143 
B) 0.0567 
C) 0.235 
D) 1.00 
E) none of the above 
A) 0.143 
B) 0.0567 
C) 0.235 
D) 1.00 
E) none of the above

Question 12

Starting with 156 g  Li2O and 33.3 g H2O,decide which reactant is present in limiting quantities. 
Given: Li2O + H2O → 2 LiOH

Accepted Answer

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

Question 13

A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O

Accepted Answer

A) 15 % 
B) 30% 
C) 60% 
D) 70% 
E) none of the above 
A) 15 % 
B) 30% 
C) 60% 
D) 70% 
E) none of the above

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled?

Accepted Answer

A) tires 
B) frames 
C) pedals 
D) both tires and frames are limiting 
E) not enough information 
A) tires 
B) frames 
C) pedals 
D) both tires and frames are limiting 
E) not enough information

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

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.

The primary greenhouse gas is carbon dioxide.

An exothermic reaction has a negative enthalpy of reaction.

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?

The primary cause of increasing greenhouse gases is:

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

In order to determine the limiting reactant in a particular reaction,one must know each of the following EXCEPT:

Diatomic O₂ can react with the element magnesium to form magnesium oxide (MgO).The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O₂,how many moles of MgO would be expected to form?

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl₃ + 3H₂

How many moles of NH₃ 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)

Starting with 156 g Li₂O and 33.3 g H₂O,decide which reactant is present in limiting quantities. Given: Li₂O + H₂O → 2 LiOH

A sample of 8.5 g NH₃on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

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

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled?

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

Organic Chemistry

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Exam 8: Quantities in Chemical Reactions

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

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.

The primary greenhouse gas is carbon dioxide.

An exothermic reaction has a negative enthalpy of reaction.

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?

The primary cause of increasing greenhouse gases is:

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

In order to determine the limiting reactant in a particular reaction,one must know each of the following EXCEPT:

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO).The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O2,how many moles of MgO would be expected to form?

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl3 + 3H2

How many moles of NH3 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)

Starting with 156 g Li2O and 33.3 g H2O,decide which reactant is present in limiting quantities. Given: Li2O + H2O → 2 LiOH

A sample of 8.5 g NH3 on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O

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

A tricycle factory uses the following items to produce one tricycle: 3 tires,1 frame,and 2 pedals. If the factory has available 270 tires,90 frames,and 170 pedals,which item would limit the amount of complete tricycles that can be assembled?

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

Organic Chemistry

Biochemistry

Filters

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?

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

Diatomic O₂ can react with the element magnesium to form magnesium oxide (MgO).The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O₂,how many moles of MgO would be expected to form?

How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCl → 2 AlCl₃ + 3H₂

How many moles of NH₃ 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)

Starting with 156 g Li₂O and 33.3 g H₂O,decide which reactant is present in limiting quantities. Given: Li₂O + H₂O → 2 LiOH

A sample of 8.5 g NH₃on oxidation produces 4.5 g of NO.Calculate the percent yield. Reaction: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

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