Question 1

How much does a sample of 5.75 mol diethyl ether, C4H10O, weigh?

Accepted Answer

A)  5.75 g 
B)  12.9 g 
C)  74.1 
D)  426 
A)  5.75 g 
B)  12.9 g 
C)  74.1 
D)  426

Question 2

Which of the following is true of a conventionally balanced chemical equation?

Accepted Answer

A)  The number of molecules on the left equal the number of molecules on the right. 
B)  The coefficients are all integers. 
C)  Both a and b are true. 
D)  Both a and b are false. 
A)  The number of molecules on the left equal the number of molecules on the right. 
B)  The coefficients are all integers. 
C)  Both a and b are true. 
D)  Both a and b are false.

Question 3

The combustion of one mole of propane, C3H8, releases 531 kcal. 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 4

What is the formula weight of aluminum sulfate, Al2(SO4) 3?

Accepted Answer

A)  75.1 amu 
B)  150.2 amu 
C)  342.2 amu 
D)  369.7 amu 
A)  75.1 amu 
B)  150.2 amu 
C)  342.2 amu 
D)  369.7 amu

Question 5

The atomic weight of platinum is less than that of gold. If you have a 10 g sample of each of these metals, which of the following is true?

Accepted Answer

A)  You have fewer of atoms of platinum than of gold. 
B)  You have equal numbers of atoms of platinum and gold. 
C)  You have more atoms of platinum than of gold. 
D)  There is insufficient information to determine which of the above is true. 
A)  You have fewer of atoms of platinum than of gold. 
B)  You have equal numbers of atoms of platinum and gold. 
C)  You have more atoms of platinum than of gold. 
D)  There is insufficient information to determine which of the above is true.

Question 6

The molecular weight of cholesterol is 710. amu. What is the mass of one molecule of cholesterol?

Accepted Answer

A) 1.18 × 10–21 g 
B) 0.00141 g 
C) 710. g 
D)  8.48 × 1020 g 
A) 1.18 × 10–21 g 
B) 0.00141 g 
C) 710. g 
D)  8.48 × 1020 g

Question 7

Which of the following is true of a voltaic cell?

Accepted Answer

A)  The anode is the negative electrode and place where reduction occurs. 
B)  The anode is the negative electrode and place where oxidation occurs. 
C)  The cathode is the negative electrode and place where reduction occurs. 
D)  The cathode is the negative electrode and place where oxidation occurs. 
A)  The anode is the negative electrode and place where reduction occurs. 
B)  The anode is the negative electrode and place where oxidation occurs. 
C)  The cathode is the negative electrode and place where reduction occurs. 
D)  The cathode is the negative electrode and place where oxidation occurs.

Question 8

Which of the following are the products of the incomplete combustion of a hydrocarbon such as methane, CH4, or propane, C3H8?

Accepted Answer

A)  CO(g) + H2O(g) 
B)  CO(g) + H2O2(l) 
C)  CO2(g) + H2O(g) 
D)  CO2(g) + H2O(l) 
A)  CO(g) + H2O(g) 
B)  CO(g) + H2O2(l) 
C)  CO2(g) + H2O(g) 
D)  CO2(g) + H2O(l)

Question 9

Consider the following representation of a voltaic cell.   This voltaic cell is represented by the following reaction:
Mg(s) + CuS1U1P12+S1S1P0(aq) → Cu(s) + MgS1U1P12+S1S1P0(aq)
-What is the identity of the ion in the solution shown in the diagram?

Accepted Answer

A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+ 
A)  Mg 
B)  Cu 
C)  Mg2+ 
D)  Cu2+

Question 10

Which of the following definitions of reduction is generally most useful when dealing with ionic materials?

Accepted Answer

A)  gain of electrons 
B)  gain of hydrogen 
C)  loss of oxygen 
D)  None, these are all equally useful. 
A)  gain of electrons 
B)  gain of hydrogen 
C)  loss of oxygen 
D)  None, these are all equally useful.

Question 11

The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?

Accepted Answer

A)  a sample which contains 6.02 × 1023 atoms of 12C 
B)  a sample which weighs exactly 12.011 grams 
C)  both a and b 
D)  neither a nor b 
A)  a sample which contains 6.02 × 1023 atoms of 12C 
B)  a sample which weighs exactly 12.011 grams 
C)  both a and b 
D)  neither a nor b

Question 12

Metabolism of one mole of glucose, C6H12O6, releases 6.70 × 102 kcal. How much heat is released by the combustion of 50.0 g of glucose?

Accepted Answer

A)  186 kcal 
B)  201 kcal 
C)  2.23 × 103 kcal 
D)  2.41 × 103 kcal 
A)  186 kcal 
B)  201 kcal 
C)  2.23 × 103 kcal 
D)  2.41 × 103 kcal

Question 13

Solutions of sugars such as glucose react with Ag+(aq) to produce Ag(s). Which of the following happens to glucose 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 14

In the reaction CH2O(g) + O2(g) → 2HCOOH(g), which species is oxidized?

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 15

In a particular experiment to prepare a compound, the theoretical yield is 34.7 G) If the actual yield is 31.2 g, what is the percent yield?

Accepted Answer

A)  0.899% 
B)  11.1% 
C)  89.9% 
D)  93.0% 
A)  0.899% 
B)  11.1% 
C)  89.9% 
D)  93.0%

Question 16

When wine turns sour it is the result 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 17

Diethyl ether can be made from ethanol. The reaction is: 2 C2H5OH(l) → (C2H5)2O(l) + H2O(l)
In one experiment 46.0 g of ethanol yielded 34.7 g of diethyl ether. What was the percent yield in this experiment?

Accepted Answer

A)  62.1% 
B)  80.4% 
C)  93.8% 
D)  97.0% 
A)  62.1% 
B)  80.4% 
C)  93.8% 
D)  97.0%

Question 18

The synthesis of a certain drug requires 4 steps. First three steps were relatively easy with percent yields of 97.1%, 94.3% and 92.8% respectively. However, the last step was very difficult with a percent yield of 72.7%. What was the overall percent yield?

Accepted Answer

A)  27. 9% 
B)  61.8% 
C)  72.7% 
D)  85.0% 
A)  27. 9% 
B)  61.8% 
C)  72.7% 
D)  85.0%

Question 19

Of the following ions, which always forms soluble compounds?

Accepted Answer

A)  Na+ 
B)  NH4+ 
C)  C2H3O2- 
D)  all of these 
A)  Na+ 
B)  NH4+ 
C)  C2H3O2- 
D)  all of these

Question 20

When an acid is added to a solution, a gas is formed. Which of the following ions might be in the solution?

Accepted Answer

A)  CO32- 
B)  OH- 
C)  SO42- 
D)  none of these 
A)  CO32- 
B)  OH- 
C)  SO42- 
D)  none of these

Exam 4: Chemical Reactions

How much does a sample of 5.75 mol diethyl ether, C4H10O, weigh?

Which of the following is true of a conventionally balanced chemical equation?

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

What is the formula weight of aluminum sulfate, Al2(SO4) 3?

The atomic weight of platinum is less than that of gold. If you have a 10 g sample of each of these metals, which of the following is true?

The molecular weight of cholesterol is 710. amu. What is the mass of one molecule of cholesterol?

Which of the following is true of a voltaic cell?

Which of the following are the products of the incomplete combustion of a hydrocarbon such as methane, CH4, or propane, C3H8?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu2+(aq) → Cu(s) + Mg2+(aq) -What is the identity of the ion in the solution shown in the diagram?

Which of the following definitions of reduction is generally most useful when dealing with ionic materials?

The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?

Metabolism of one mole of glucose, C6H12O6, releases 6.70 × 102 kcal. How much heat is released by the combustion of 50.0 g of glucose?

Solutions of sugars such as glucose react with Ag+(aq) to produce Ag(s). Which of the following happens to glucose in this reaction?

In the reaction CH2O(g) + O2(g) → 2HCOOH(g), which species is oxidized?

In a particular experiment to prepare a compound, the theoretical yield is 34.7 G) If the actual yield is 31.2 g, what is the percent yield?

When wine turns sour it is the result of the conversion of ethanol, C2H5OH, to acetic acid, HC2H3O2. Which of the following happens to ethanol in this reaction?

Diethyl ether can be made from ethanol. The reaction is: 2 C2H5OH(l) → (C2H5)2O(l) + H2O(l) In one experiment 46.0 g of ethanol yielded 34.7 g of diethyl ether. What was the percent yield in this experiment?

The synthesis of a certain drug requires 4 steps. First three steps were relatively easy with percent yields of 97.1%, 94.3% and 92.8% respectively. However, the last step was very difficult with a percent yield of 72.7%. What was the overall percent yield?

Of the following ions, which always forms soluble compounds?

When an acid is added to a solution, a gas is formed. Which of the following ions might be in the solution?

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 and Alkynes

Benzene and Its Derivatives

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

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Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

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Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

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Filters

How much does a sample of 5.75 mol diethyl ether, C₄H₁₀O, weigh?

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

What is the formula weight of aluminum sulfate, Al₂(SO₄) ₃?

Which of the following are the products of the incomplete combustion of a hydrocarbon such as methane, CH₄, or propane, C₃H₈?

Consider the following representation of a voltaic cell. This voltaic cell is represented by the following reaction: Mg(s) + Cu²⁺(aq) → Cu(s) + Mg²⁺(aq) -What is the identity of the ion in the solution shown in the diagram?

The mass of an atom of ¹²C is exactly 12 atomic mass units. Which of the following describes a mole of ¹²C atoms?

Metabolism of one mole of glucose, C₆H₁₂O₆, releases 6.70 × 10² kcal. How much heat is released by the combustion of 50.0 g of glucose?

Solutions of sugars such as glucose react with Ag⁺(aq) to produce Ag(s). Which of the following happens to glucose in this reaction?

In the reaction CH₂O(g) + O₂(g) → 2HCOOH(g), which species is oxidized?

When wine turns sour it is the result of the conversion of ethanol, C₂H₅OH, to acetic acid, HC₂H₃O₂. Which of the following happens to ethanol in this reaction?

Diethyl ether can be made from ethanol. The reaction is: 2 C₂H₅OH(l) → (C₂H₅)₂O(l) + H₂O(l) In one experiment 46.0 g of ethanol yielded 34.7 g of diethyl ether. What was the percent yield in this experiment?