Question 1

Which species is the reducing agent in the reaction Pb(s) + 2Ag+(aq) → Pb2+(aq) + 2Ag(s)?

Accepted Answer

A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s) 
A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s)

Question 2

Which of the following is true of all combustion reactions?

Accepted Answer

A)  They are always endothermic. 
B)  They always produce carbon dioxide. 
C)  They are always endothermic and they always produce carbon dioxide. 
D)  They are not always endothermic and they do not always produce carbon dioxide. 
A)  They are always endothermic. 
B)  They always produce carbon dioxide. 
C)  They are always endothermic and they always produce carbon dioxide. 
D)  They are not always endothermic and they do not always produce carbon dioxide.

Question 3

Which of the following is the correct set of integer coefficients for the balanced equation? ___C5H12(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

Accepted Answer

A)  1, 5, 5, 6 
B)  1, 8, 5, 6 
C)  5, 1, 8, 6 
D)  5, 12, 2, 4 
A)  1, 5, 5, 6 
B)  1, 8, 5, 6 
C)  5, 1, 8, 6 
D)  5, 12, 2, 4

Question 4

0.789 mol of a particular substance weighs 142 g. What is the molar mass of this substance?

Accepted Answer

A)  0.00556 g 
B)  0.00556 amu 
C)  180 g 
D)  180 amu 
A)  0.00556 g 
B)  0.00556 amu 
C)  180 g 
D)  180 amu

Question 5

The combustion of one mole of propane, C3H8, releases 531 kcal of heat. How much heat is released by the combustion of 1.20 moles of propane?

Accepted Answer

A)  443 kcal 
B)  584 kcal 
C)  637 kcal 
D)  690 kcal 
A)  443 kcal 
B)  584 kcal 
C)  637 kcal 
D)  690 kcal

Question 6

When solutions of AgNO3 and NaOH react, the balanced molecular equation is as follows: 2AgNO3(aq) + 2NaOH(aq) → Ag2O(s) + 2NaNO3(aq) + H2O(l)
How much Ag2O is produced when 0.200 g of AgNO3 and 0.200 g of NaOH react?

Accepted Answer

A)  0.127 g 
B)  0.136 g 
C)  0.273 g 
D)  0.400 g 
A)  0.127 g 
B)  0.136 g 
C)  0.273 g 
D)  0.400 g

Question 7

Given the reaction 2HgO(s) → 2Hg(l) + O2(g), what weight of elemental mercury will be obtained by the decomposition of 0.125 mol of HgO?

Accepted Answer

A)  13.5 g 
B)  25.0 g 
C)  27.0 g 
D)  50.0 g 
A)  13.5 g 
B)  25.0 g 
C)  27.0 g 
D)  50.0 g

Question 8

Wine turns sour because of the conversion of ethanol, C2H5OH, to acetic acid, HC2H3O2. Which of the following happens to ethanol in this reaction?

Accepted Answer

A)  It is reduced. 
B)  It is oxidized. 
C)  It is both oxidized and reduced. 
D)  It is neither oxidized nor reduced. 
A)  It is reduced. 
B)  It is oxidized. 
C)  It is both oxidized and reduced. 
D)  It is neither oxidized nor reduced.

Question 9

In an experiment to prepare aspirin, the percent yield was 94.3%. If the actual yield was 124.3 g, what was the theoretical yield for this experiment?

Accepted Answer

A)  94.3 g 
B)  117 g 
C)  132 g 
D)  234 g 
A)  94.3 g 
B)  117 g 
C)  132 g 
D)  234 g

Question 10

Which species is oxidized in the reaction CH2O(g) + O2(g) → 2HCOOH(g)?

Accepted Answer

A)  CH2O(g) 
B)  O2(g) 
C)  HCOOH(g) 
D)  H2O(g) 
A)  CH2O(g) 
B)  O2(g) 
C)  HCOOH(g) 
D)  H2O(g)

Question 11

Which species is oxidized in the reaction Pb(s) + 2Ag+(aq) → Pb2+(aq) + 2Ag(s)?

Accepted Answer

A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s) 
A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s)

Question 12

In a blast furnace, coke, which is solid carbon, reacts with O2(g) to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe2O3(s)?

Accepted Answer

A)  2Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) 
B)  2Fe2O3(s) + 2CO(g) → 4Fe(s) + 2CO2(g) 
C)  2Fe2O3(s) + 3CO(g) → 4Fe(s) + 3CO2(g) 
D)  Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) 
A)  2Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) 
B)  2Fe2O3(s) + 2CO(g) → 4Fe(s) + 2CO2(g) 
C)  2Fe2O3(s) + 3CO(g) → 4Fe(s) + 3CO2(g) 
D)  Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)

Question 13

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N2(g) + 3H2(g) → 2NH3(g)?

Accepted Answer

A)  the number of molecules of NH3 obtained if 4.2 mol of N2 react completely to form NH3 
B)  the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3 
C)  the number of molecules of NH3 obtained if 4.2 mol of N2 react completely to form NH3, and the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3. 
D)  None of these are true. 
A)  the number of molecules of NH3 obtained if 4.2 mol of N2 react completely to form NH3 
B)  the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3 
C)  the number of molecules of NH3 obtained if 4.2 mol of N2 react completely to form NH3, and the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3. 
D)  None of these are true.

Question 14

Which species is reduced in the reaction Pb(s) + 2Ag+(aq) → Pb2+(aq) + 2Ag(s)?

Accepted Answer

A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s) 
A)  Pb(s) 
B)  Ag+(aq) 
C)  Pb2+(aq) 
D)  Ag(s)

Question 15

How many moles of oxygen atoms are present in 5.20 mol of Al2(SO4)3?

Accepted Answer

A)  15.6 
B)  20.8 
C)  62.4 
D)  3.76 × 1025 
A)  15.6 
B)  20.8 
C)  62.4 
D)  3.76 × 1025

Question 16

How many moles of hydrogen atoms are there in 2.50 mol of C6H12O6?

Accepted Answer

A)  2.50 
B)  30.0 
C)  1.51 × 1024 
D)  1.81 × 1025 
A)  2.50 
B)  30.0 
C)  1.51 × 1024 
D)  1.81 × 1025

Question 17

Which species is reduced in the reaction CH2O(g) + O2(g) → 2HCOOH(g)?

Accepted Answer

A)  CH2O(g) 
B)  O2(g) 
C)  HCOOH(g) 
D)  H2O(g) 
A)  CH2O(g) 
B)  O2(g) 
C)  HCOOH(g) 
D)  H2O(g)

Question 18

The image shows several types of burners used in chemistry laboratories.   Which of the following is true irrespective of whether the burners use natural gas, propane, or butane as fuel? ​

Accepted Answer

A)  The reactions are classified as combustion reactions. 
B)  The reactions are classified as redox reactions. 
C)  The reactions are classified as exothermic. 
D)  All of these statements are correct. 
A)  The reactions are classified as combustion reactions. 
B)  The reactions are classified as redox reactions. 
C)  The reactions are classified as exothermic. 
D)  All of these statements are correct.

Question 19

Which of the following is true of all combustion reactions?

Accepted Answer

A)  They are always exothermic. 
B)  They always produce carbon dioxide. 
C)  They are always exothermic and they always produce carbon dioxide. 
D)  They are not always exothermic and they do not always produce carbon dioxide. 
A)  They are always exothermic. 
B)  They always produce carbon dioxide. 
C)  They are always exothermic and they always produce carbon dioxide. 
D)  They are not always exothermic and they do not always produce carbon dioxide.

Question 20

Which of the following compounds has the largest formula weight?

Accepted Answer

A)  aluminum acetate 
B)  calcium acetate 
C)  potassium acetate 
D)  sodium acetate 
A)  aluminum acetate 
B)  calcium acetate 
C)  potassium acetate 
D)  sodium acetate

Exam 4: Chemical Reactions

Which species is the reducing agent in the reaction Pb(s) + 2Ag+(aq) → Pb2+(aq) + 2Ag(s)?

Which of the following is true of all combustion reactions?

Which of the following is the correct set of integer coefficients for the balanced equation? ___C5H12(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

0.789 mol of a particular substance weighs 142 g. What is the molar mass of this substance?

The combustion of one mole of propane, C3H8, releases 531 kcal of heat. How much heat is released by the combustion of 1.20 moles of propane?

When solutions of AgNO3 and NaOH react, the balanced molecular equation is as follows: 2AgNO3(aq) + 2NaOH(aq) → Ag2O(s) + 2NaNO3(aq) + H2O(l) How much Ag2O is produced when 0.200 g of AgNO3 and 0.200 g of NaOH react?

Given the reaction 2HgO(s) → 2Hg(l) + O2(g), what weight of elemental mercury will be obtained by the decomposition of 0.125 mol of HgO?

Wine turns sour because of the conversion of ethanol, C2H5OH, to acetic acid, HC2H3O2. Which of the following happens to ethanol in this reaction?

In an experiment to prepare aspirin, the percent yield was 94.3%. If the actual yield was 124.3 g, what was the theoretical yield for this experiment?

Which species is oxidized in the reaction CH2O(g) + O2(g) → 2HCOOH(g)?

Which species is oxidized in the reaction Pb(s) + 2Ag+(aq) → Pb2+(aq) + 2Ag(s)?

In a blast furnace, coke, which is solid carbon, reacts with O2(g) to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe2O3(s)?

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N2(g) + 3H2(g) → 2NH3(g)?

Which species is reduced in the reaction Pb(s) + 2Ag+(aq) → Pb2+(aq) + 2Ag(s)?

How many moles of oxygen atoms are present in 5.20 mol of Al2(SO4)3?

How many moles of hydrogen atoms are there in 2.50 mol of C6H12O6?

Which species is reduced in the reaction CH2O(g) + O2(g) → 2HCOOH(g)?

The image shows several types of burners used in chemistry laboratories. Which of the following is true irrespective of whether the burners use natural gas, propane, or butane as fuel? ​

Which of the following is true of all combustion reactions?

Which of the following compounds has the largest formula weight?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters

Which species is the reducing agent in the reaction Pb(s) + 2Ag⁺(aq) → Pb²⁺(aq) + 2Ag(s)?

Which of the following is the correct set of integer coefficients for the balanced equation? _C₅H₁₂(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

The combustion of one mole of propane, C₃H₈, releases 531 kcal of heat. How much heat is released by the combustion of 1.20 moles of propane?

When solutions of AgNO₃ and NaOH react, the balanced molecular equation is as follows: 2AgNO₃(aq) + 2NaOH(aq) → Ag₂O(s) + 2NaNO₃(aq) + H₂O(l) How much Ag₂O is produced when 0.200 g of AgNO₃ and 0.200 g of NaOH react?

Given the reaction 2HgO(s) → 2Hg(l) + O₂(g), what weight of elemental mercury will be obtained by the decomposition of 0.125 mol of HgO?

Wine turns sour because of the conversion of ethanol, C₂H₅OH, to acetic acid, HC₂H₃O₂. Which of the following happens to ethanol in this reaction?

Which species is oxidized in the reaction CH₂O(g) + O₂(g) → 2HCOOH(g)?

Which species is oxidized in the reaction Pb(s) + 2Ag⁺(aq) → Pb²⁺(aq) + 2Ag(s)?

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe₂O₃(s)?

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N₂(g) + 3H₂(g) → 2NH₃(g)?

Which species is reduced in the reaction Pb(s) + 2Ag⁺(aq) → Pb²⁺(aq) + 2Ag(s)?

How many moles of oxygen atoms are present in 5.20 mol of Al₂(SO₄)₃?

How many moles of hydrogen atoms are there in 2.50 mol of C₆H₁₂O₆?

Which species is reduced in the reaction CH₂O(g) + O₂(g) → 2HCOOH(g)?

The image shows several types of burners used in chemistry laboratories. Which of the following is true irrespective of whether the burners use natural gas, propane, or butane as fuel?