Question 1

How many molecules are present in one mole of water, H2O?

Accepted Answer

A)  1.66 × 10-24 
B)  3.00 × 10-23 
C)  3.24 × 1023 
D)  6.02 × 1023 
A)  1.66 × 10-24 
B)  3.00 × 10-23 
C)  3.24 × 1023 
D)  6.02 × 1023

Question 2

Given the reaction 2HgO(s) → 2Hg(l) + O2(g), what weight of elemental mercury will be obtained by the decomposition of 94.5 g of HgO?

Accepted Answer

A)  43.8 g 
B)  78.5 g 
C)  87.5 g 
D)  175 g 
A)  43.8 g 
B)  78.5 g 
C)  87.5 g 
D)  175 g

Question 3

Which of the following is true of acetate salts and nitrate salts?

Accepted Answer

A)  All acetate salts are soluble, but all nitrate salts are insoluble. 
B)  All nitrate salts are soluble, but all acetate salts are insoluble. 
C)  All acetate salts and all nitrate salts are soluble. 
D)  All acetate salts and all nitrate salts are insoluble. 
A)  All acetate salts are soluble, but all nitrate salts are insoluble. 
B)  All nitrate salts are soluble, but all acetate salts are insoluble. 
C)  All acetate salts and all nitrate salts are soluble. 
D)  All acetate salts and all nitrate salts are insoluble.

Question 4

Which of the following statements is true of the balanced equation N2(g) + 2O2(g) → 2NO2(g)?

Accepted Answer

A)  One mole of nitrogen reacts with two moles of oxygen to form two moles of nitrogen dioxide. 
B)  One gram of nitrogen reacts with two grams of oxygen to form two grams of nitrogen dioxide. 
C)  One mole of nitrogen reacts with two moles of oxygen to form two moles of nitrogen dioxide, and one gram of nitrogen reacts with two grams of oxygen to form two grams of nitrogen dioxide. 
D)  None of these are true. 
A)  One mole of nitrogen reacts with two moles of oxygen to form two moles of nitrogen dioxide. 
B)  One gram of nitrogen reacts with two grams of oxygen to form two grams of nitrogen dioxide. 
C)  One mole of nitrogen reacts with two moles of oxygen to form two moles of nitrogen dioxide, and one gram of nitrogen reacts with two grams of oxygen to form two grams of nitrogen dioxide. 
D)  None of these are true.

Question 5

Diethyl ether can be made from ethanol. The reaction is as follows: 2C2H5OH(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 6

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 that weighs exactly 12 atomic mass units 
B)  a sample that contains 6.02 × 1023 atoms of 12C 
C)  a sample that weighs exactly 12 atomic mass units and a sample that contains 6.02 x 1023 atoms of 12C 
D)  neither a sample that weighs exactly 12 atomic mass units or a sample that contains 6.02 x 1023 atoms of 12C 
A)  a sample that weighs exactly 12 atomic mass units 
B)  a sample that contains 6.02 × 1023 atoms of 12C 
C)  a sample that weighs exactly 12 atomic mass units and a sample that contains 6.02 x 1023 atoms of 12C 
D)  neither a sample that weighs exactly 12 atomic mass units or a sample that contains 6.02 x 1023 atoms of 12C

Question 7

Which of the following is the correct unit for formula weight?

Accepted Answer

A)  atomic mass units 
B)  grams 
C)  ounces 
D)  pounds 
A)  atomic mass units 
B)  grams 
C)  ounces 
D)  pounds

Question 8

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 9

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH3OH(g) + CO(g) → CH3COOH(l)
How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

Accepted Answer

A)  16.6 g 
B)  33.2 g 
C)  465 g 
D)  996 g 
A)  16.6 g 
B)  33.2 g 
C)  465 g 
D)  996 g

Question 10

A person drinks 1.50 × 103 g of water, H2O, per day. How many moles is this?

Accepted Answer

A)  0.0120 
B)  8.33 
C)  83.3 
D)  1.20 × 102 
A)  0.0120 
B)  8.33 
C)  83.3 
D)  1.20 × 102

Question 11

How many joules make a kilocalorie?

Accepted Answer

A)  2,184 joules 
B)  3,184 joules 
C)  4,184 joules 
D)  5,184 joules 
A)  2,184 joules 
B)  3,184 joules 
C)  4,184 joules 
D)  5,184 joules

Question 12

These burners use butane (C4H10), which reacts with oxygen to form carbon dioxide and water. How many moles of oxygen are used in the balanced equation for the reaction?

Accepted Answer

A)  6 
B)  8 
C)  10 
D)  13 
A)  6 
B)  8 
C)  10 
D)  13

Question 13

How many molecules are present in one mole of glucose, C6H12O6?

Accepted Answer

A)  6.92 ×10-26 
B)  3.34 × 1021 
C)  6.02 × 1023 
D)  1.44 × 1025 
A)  6.92 ×10-26 
B)  3.34 × 1021 
C)  6.02 × 1023 
D)  1.44 × 1025

Question 14

When solutions of H2SO4 and NaOH react, the balanced molecular equation is as follows: H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)
How much Na2SO4 is obtained when 4.00 g of H2SO4 reacts with 4.00 g of NaOH?

Accepted Answer

A)  2.98 g 
B)  5.80 g 
C)  7.10 g 
D)  8.00 g 
A)  2.98 g 
B)  5.80 g 
C)  7.10 g 
D)  8.00 g

Question 15

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C2H4(g) + H2O(g) → C2H5OH(l)
If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Accepted Answer

A)  7.24 g 
B)  14.5 g 
C)  203 g 
D)  334 g 
A)  7.24 g 
B)  14.5 g 
C)  203 g 
D)  334 g

Question 16

Which of the following is true of a voltaic cell?

Accepted Answer

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

Question 17

Sodium sulfite, Na2SO3(aq), is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na2SO4(aq). Which of the following is the balanced equation for this reaction?

Accepted Answer

A)  Na2SO3(aq) + O(g) → Na2SO4(aq) 
B)  Na2SO3(aq) + 2O(g) → Na2SO4(aq) 
C)  2Na2SO3(aq) + O2(g) → 2Na2SO4(aq) 
D)  Na2SO3(aq) + O2(g) → Na2SO4(aq) 
A)  Na2SO3(aq) + O(g) → Na2SO4(aq) 
B)  Na2SO3(aq) + 2O(g) → Na2SO4(aq) 
C)  2Na2SO3(aq) + O2(g) → 2Na2SO4(aq) 
D)  Na2SO3(aq) + O2(g) → Na2SO4(aq)

Question 18

Which species is the oxidizing 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 19

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH3OH(g) + CO(g) → CH3COOH(l)
How many grams of CO(g) are required to produce 49.4 g of acetic acid?

Accepted Answer

A)  23.0 g 
B)  28.0 g 
C)  60.1 g 
D)  88.1 g 
A)  23.0 g 
B)  28.0 g 
C)  60.1 g 
D)  88.1 g

Question 20

A serving of a particular fruit dessert contains 20.0 g of sugar. If all the sugar is sucrose, C12H22O11, how many molecules of sugar are present in this serving?

Accepted Answer

A)  0.0584 
B)  17.1 
C)  3.52 × 1022 
D)  1.03 × 1025 
A)  0.0584 
B)  17.1 
C)  3.52 × 1022 
D)  1.03 × 1025

Exam 4: Chemical Reactions

How many molecules are present in one mole of water, H2O?

Given the reaction 2HgO(s) → 2Hg(l) + O2(g), what weight of elemental mercury will be obtained by the decomposition of 94.5 g of HgO?

Which of the following is true of acetate salts and nitrate salts?

Which of the following statements is true of the balanced equation N2(g) + 2O2(g) → 2NO2(g)?

Diethyl ether can be made from ethanol. The reaction is as follows: 2C2H5OH(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 mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?

Which of the following is the correct unit for formula weight?

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

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH3OH(g) + CO(g) → CH3COOH(l) How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

A person drinks 1.50 × 103 g of water, H2O, per day. How many moles is this?

How many joules make a kilocalorie?

These burners use butane (C4H10), which reacts with oxygen to form carbon dioxide and water. How many moles of oxygen are used in the balanced equation for the reaction?

How many molecules are present in one mole of glucose, C6H12O6?

When solutions of H2SO4 and NaOH react, the balanced molecular equation is as follows: H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l) How much Na2SO4 is obtained when 4.00 g of H2SO4 reacts with 4.00 g of NaOH?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C2H4(g) + H2O(g) → C2H5OH(l) If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Which of the following is true of a voltaic cell?

Sodium sulfite, Na2SO3(aq), is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na2SO4(aq). Which of the following is the balanced equation for this reaction?

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

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH3OH(g) + CO(g) → CH3COOH(l) How many grams of CO(g) are required to produce 49.4 g of acetic acid?

A serving of a particular fruit dessert contains 20.0 g of sugar. If all the sugar is sucrose, C12H22O11, how many molecules of sugar are present in this serving?

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

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Filters

How many molecules are present in one mole of water, H₂O?

Given the reaction 2HgO(s) → 2Hg(l) + O₂(g), what weight of elemental mercury will be obtained by the decomposition of 94.5 g of HgO?

Which of the following statements is true of the balanced equation N₂(g) + 2O₂(g) → 2NO₂(g)?

Diethyl ether can be made from ethanol. The reaction is as follows: 2C₂H₅OH(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 mass of an atom of ¹²C is exactly 12 atomic mass units. Which of the following describes a mole of ¹²C atoms?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

A person drinks 1.50 × 10³ g of water, H₂O, per day. How many moles is this?

These burners use butane (C₄H₁₀), which reacts with oxygen to form carbon dioxide and water. How many moles of oxygen are used in the balanced equation for the reaction?

How many molecules are present in one mole of glucose, C₆H₁₂O₆?

When solutions of H₂SO₄ and NaOH react, the balanced molecular equation is as follows: H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l) How much Na₂SO₄ is obtained when 4.00 g of H₂SO₄ reacts with 4.00 g of NaOH?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Sodium sulfite, Na₂SO₃(aq), is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na₂SO₄(aq). Which of the following is the balanced equation for this reaction?

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

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) How many grams of CO(g) are required to produce 49.4 g of acetic acid?

A serving of a particular fruit dessert contains 20.0 g of sugar. If all the sugar is sucrose, C₁₂H₂₂O₁₁, how many molecules of sugar are present in this serving?