Question 1

Which of the following is a consideration in the design of air bags?

Accepted Answer

A)  The chemical reaction must be very fast. 
B)  The reactants must be stable compounds. 
C)  The air bag must be able to fit into a small space when not inflated. 
D)  The chemical reaction must produce a gas. 
E)  All of the above are considerations. 
A)  The chemical reaction must be very fast. 
B)  The reactants must be stable compounds. 
C)  The air bag must be able to fit into a small space when not inflated. 
D)  The chemical reaction must produce a gas. 
E)  All of the above are considerations.

Question 2

The following chemical equation, the decomposition of hydrogen peroxide to water, is not balanced.What must be done to the equation to make it balanced? 2 H2O2(l)→ 2 H2O(l)

Accepted Answer

A)  Change the coefficients from 2 to 1. 
B)  Add an atom of oxygen to the products. 
C)  Add a molecule of O2 to the products. 
D)  Change the state of matter in the products. 
E)  Change the subscripts of H2O to H2O2. 
A)  Change the coefficients from 2 to 1. 
B)  Add an atom of oxygen to the products. 
C)  Add a molecule of O2 to the products. 
D)  Change the state of matter in the products. 
E)  Change the subscripts of H2O to H2O2.

Question 3

Which of the following reactions is NOT balanced?

Accepted Answer

A)  2 Al + 6 HCl → 2 AlCl3 + 3 H2 
B)  Fe2O3 + 2 Al → 2 Fe + Al2O3 
C)  C6H12O6 + 6 O2 → 6 CO2 + 6 H2O 
D)  C2H6O + O2 → 2 CO2 + 3 H2O 
E)  CaO + 3 C → CaC2 + CO 
A)  2 Al + 6 HCl → 2 AlCl3 + 3 H2 
B)  Fe2O3 + 2 Al → 2 Fe + Al2O3 
C)  C6H12O6 + 6 O2 → 6 CO2 + 6 H2O 
D)  C2H6O + O2 → 2 CO2 + 3 H2O 
E)  CaO + 3 C → CaC2 + CO

Question 4

Which of the following must occur for there to be a chemical reaction?

Accepted Answer

A)  There is a change of color. 
B)  There is a change of state. 
C)  A gas is produced. 
D)  Bonds break and/or new ones are formed. 
E)  The reaction mixture increases in temperature. 
A)  There is a change of color. 
B)  There is a change of state. 
C)  A gas is produced. 
D)  Bonds break and/or new ones are formed. 
E)  The reaction mixture increases in temperature.

Question 5

Under what circumstances is mass conserved?

Accepted Answer

A)  Mass is conserved only in the laboratory. 
B)  Mass is conserved only theoretically. 
C)  Mass is conserved everywhere except the human body. 
D)  Mass is conserved in nature but not in the laboratory. 
E)  Mass is conserved during all chemical reactions. 
A)  Mass is conserved only in the laboratory. 
B)  Mass is conserved only theoretically. 
C)  Mass is conserved everywhere except the human body. 
D)  Mass is conserved in nature but not in the laboratory. 
E)  Mass is conserved during all chemical reactions.

Question 6

What does it mean for a chemical equation to be balanced?

Accepted Answer

A)  A balanced chemical equation describes a chemical reaction found in nature. 
B)  A balanced chemical equation describes a chemical reaction that produces only some product, so there is an equal amount of reactant and product. 
C)  A balanced chemical equation contains an equal number of each type of atoms on both sides of the equation. 
D)  A balanced chemical equation can run either forward or backward. 
E)  A balanced chemical equation represents a chemical reaction that is part of metabolism. 
A)  A balanced chemical equation describes a chemical reaction found in nature. 
B)  A balanced chemical equation describes a chemical reaction that produces only some product, so there is an equal amount of reactant and product. 
C)  A balanced chemical equation contains an equal number of each type of atoms on both sides of the equation. 
D)  A balanced chemical equation can run either forward or backward. 
E)  A balanced chemical equation represents a chemical reaction that is part of metabolism.

Question 7

Jane Doe has a cholesterol (C27H46O)count of 178 mg/dL.You would like to calculate the number of cholesterol molecules that Jane Doe has in each deciliter of blood.Which of the following unit conversions are required to calculate the number of cholesterol molecules per deciliter?
i.   
II.   
III.   
IV.

Accepted Answer

A)  All of the conversions are needed. 
B)  I and IV 
C)  III and IV 
D)  I, II, and III 
E)  II, III, and IV 
A)  All of the conversions are needed. 
B)  I and IV 
C)  III and IV 
D)  I, II, and III 
E)  II, III, and IV

Question 8

What is the primary relationship between a chemical reaction and a chemical equation?

Accepted Answer

A)  There is no relationship between a chemical reaction and a chemical equation. 
B)  A chemical equation is the written representation of a chemical reaction. 
C)  A chemical equation follows the law of conservation of mass but a chemical reaction does not. 
D)  A chemical equation shows the proportion of reactants and products but a chemical reaction does not necessarily reflect those proportions. 
E)  Chemical equations and chemical reactions are exactly the same thing. 
A)  There is no relationship between a chemical reaction and a chemical equation. 
B)  A chemical equation is the written representation of a chemical reaction. 
C)  A chemical equation follows the law of conservation of mass but a chemical reaction does not. 
D)  A chemical equation shows the proportion of reactants and products but a chemical reaction does not necessarily reflect those proportions. 
E)  Chemical equations and chemical reactions are exactly the same thing.

Question 9

In an oxidation-reduction reaction, the species that gains electrons is _______.

Accepted Answer

A)  oxygen 
B)  oxidized 
C)  hydrogen 
D)  reduced 
E)  carbon 
A)  oxygen 
B)  oxidized 
C)  hydrogen 
D)  reduced 
E)  carbon

Question 10

The balanced equation for the combustion of propane is given below.What do the numbers in front of the molecules (the coefficients)mean? C3H8 + 5 O2 → 3 CO2 + 4 H2O

Accepted Answer

A)  Three molecules of CO2 are produced when one molecule of C3H8 reacts with one molecule of O2. 
B)  Six molecules of CO2 are produced when two molecules of C3H8 react with two molecules of O2. 
C)  Nine moles of CO2 are produced when three moles of C3H8 react with three moles of O2. 
D)  Four moles of H2O are produced when one mole of C3H8 reacts with one mole of O2. 
E)  All of the above representations are correct. 
A)  Three molecules of CO2 are produced when one molecule of C3H8 reacts with one molecule of O2. 
B)  Six molecules of CO2 are produced when two molecules of C3H8 react with two molecules of O2. 
C)  Nine moles of CO2 are produced when three moles of C3H8 react with three moles of O2. 
D)  Four moles of H2O are produced when one mole of C3H8 reacts with one mole of O2. 
E)  All of the above representations are correct.

Question 11

How many moles of carbon are in 27.1 g of carbon?

Accepted Answer

A)  2.26 mol 
B)  325 mol 
C)  0.443 mol 
D)  5.52 mol 
E)  163 mol 
A)  2.26 mol 
B)  325 mol 
C)  0.443 mol 
D)  5.52 mol 
E)  163 mol

Question 12

The balanced chemical equation for the combustion of propane (C3H8)is given below.How many grams of carbon dioxide (CO2)are released when 35 g of propane are burned in the presence of excess oxygen? C3H8 + 5 O2 → 3 CO2 + 4 H2O

Accepted Answer

A)  0.80 g 
B)  12 g 
C)  35 g 
D)  105 g 
E)  1,500 g 
A)  0.80 g 
B)  12 g 
C)  35 g 
D)  105 g 
E)  1,500 g

Question 13

How many atoms of oxygen are present in the reactants of this chemical equation? Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 14

Is methane (CH4)undergoing oxidation or reduction during this reaction, and how can you tell? CH4 + 2 O2 → CO2 + 2 H2O

Accepted Answer

A)  Methane is oxidized because there is an increase in oxygen and a decrease in hydrogen. 
B)  Methane is reduced because there is an increase in oxygen and a decrease in hydrogen. 
C)  Methane is oxidized because it becomes a gas. 
D)  Methane is reduced because water is formed. 
E)  Methane is reduced because carbon becomes a gas. 
A)  Methane is oxidized because there is an increase in oxygen and a decrease in hydrogen. 
B)  Methane is reduced because there is an increase in oxygen and a decrease in hydrogen. 
C)  Methane is oxidized because it becomes a gas. 
D)  Methane is reduced because water is formed. 
E)  Methane is reduced because carbon becomes a gas.

Question 15

A chemical reaction involves many changes but not everything changes during a reaction.Which of the following is NOT a change that occurs during a chemical reaction?

Accepted Answer

A)  Atoms change in number or identity. 
B)  Bonds break. 
C)  Heat is released and/or absorbed. 
D)  New bonds form. 
E)  New molecules are formed. 
A)  Atoms change in number or identity. 
B)  Bonds break. 
C)  Heat is released and/or absorbed. 
D)  New bonds form. 
E)  New molecules are formed.

Question 16

Which statement describes how molecular mass and molar mass differ?

Accepted Answer

A)  Molecular mass is the mass of one molecule, whereas molar mass is the mass of one mole. 
B)  Molar mass is measured in atomic mass units, whereas molecular mass is measured in grams per mole. 
C)  A molar mass is the mass of one formula unit, whereas molecular mass is the mass of one molecule. 
D)  A molar mass is the mass of one molecule, whereas molecular mass is the mass of one formula unit. 
E)  There is no difference between these terms. 
A)  Molecular mass is the mass of one molecule, whereas molar mass is the mass of one mole. 
B)  Molar mass is measured in atomic mass units, whereas molecular mass is measured in grams per mole. 
C)  A molar mass is the mass of one formula unit, whereas molecular mass is the mass of one molecule. 
D)  A molar mass is the mass of one molecule, whereas molecular mass is the mass of one formula unit. 
E)  There is no difference between these terms.

Question 17

What type of reaction is the addition of hydrochloric acid (HCl)to propene?

Accepted Answer

A)  combination 
B)  decomposition 
C)  single replacement 
D)  double replacement 
E)  oxidation-reduction 
A)  combination 
B)  decomposition 
C)  single replacement 
D)  double replacement 
E)  oxidation-reduction

Question 18

Which of the following is NOT indicated by a chemical equation?

Accepted Answer

A)  the formulas of the reactants and products of a chemical reaction 
B)  the ratio of reactants and products in a chemical reaction 
C)  how fast a chemical reaction proceeds 
D)  the quantitative relationship between reactants and products in a chemical reaction 
E)  the state of matter of reactants and products 
A)  the formulas of the reactants and products of a chemical reaction 
B)  the ratio of reactants and products in a chemical reaction 
C)  how fast a chemical reaction proceeds 
D)  the quantitative relationship between reactants and products in a chemical reaction 
E)  the state of matter of reactants and products

Question 19

Which of the following correctly determines the formula mass of sodium sulfate (Na2SO4)?

Accepted Answer

A)  7 × (23 amu + 32 amu + 16 amu) 
B)  2 × 23 amu + 4 × (32 amu + 16 amu) 
C)  2 × 23 amu + 32 amu + 4 × 16 amu 
D)  2 × 11 amu + 16 amu + 4 × 8 amu 
E)  2 × 11 amu + 4 × (16 amu + 8 amu) 
A)  7 × (23 amu + 32 amu + 16 amu) 
B)  2 × 23 amu + 4 × (32 amu + 16 amu) 
C)  2 × 23 amu + 32 amu + 4 × 16 amu 
D)  2 × 11 amu + 16 amu + 4 × 8 amu 
E)  2 × 11 amu + 4 × (16 amu + 8 amu)

Question 20

Does one mole of the antibiotic penicillin G (C16H18N2O4S)weigh more or less than one mole of the antibiotic streptomycin (C21H39N7O12)?

Accepted Answer

A)  They weigh the same because a mole always has the same mass. 
B)  They weigh the same because a mole always has the same number of particles in it. 
C)  Streptomycin weighs more because its individual molecules are larger. 
D)  Penicillin weighs more because its individual molecules are larger. 
E)  It is not possible to determine which one would weigh more because mole size varies. 
A)  They weigh the same because a mole always has the same mass. 
B)  They weigh the same because a mole always has the same number of particles in it. 
C)  Streptomycin weighs more because its individual molecules are larger. 
D)  Penicillin weighs more because its individual molecules are larger. 
E)  It is not possible to determine which one would weigh more because mole size varies.

Which of the following is a consideration in the design of air bags?

The following chemical equation, the decomposition of hydrogen peroxide to water, is not balanced.What must be done to the equation to make it balanced? 2 H₂O₂(l)→ 2 H₂O(l)

Which of the following reactions is NOT balanced?

Which of the following must occur for there to be a chemical reaction?

Under what circumstances is mass conserved?

What does it mean for a chemical equation to be balanced?

What is the primary relationship between a chemical reaction and a chemical equation?

In an oxidation-reduction reaction, the species that gains electrons is _______.

The balanced equation for the combustion of propane is given below.What do the numbers in front of the molecules (the coefficients)mean? C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

How many moles of carbon are in 27.1 g of carbon?

The balanced chemical equation for the combustion of propane (C₃H₈)is given below.How many grams of carbon dioxide (CO₂)are released when 35 g of propane are burned in the presence of excess oxygen? C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

How many atoms of oxygen are present in the reactants of this chemical equation? Mg(OH)₂ + 2 HCl → MgCl₂ + 2 H₂O

Is methane (CH₄)undergoing oxidation or reduction during this reaction, and how can you tell? CH₄ + 2 O₂ → CO₂ + 2 H₂O

A chemical reaction involves many changes but not everything changes during a reaction.Which of the following is NOT a change that occurs during a chemical reaction?

Which statement describes how molecular mass and molar mass differ?

What type of reaction is the addition of hydrochloric acid (HCl)to propene?

Which of the following is NOT indicated by a chemical equation?

Which of the following correctly determines the formula mass of sodium sulfate (Na₂SO₄)?

Does one mole of the antibiotic penicillin G (C₁₆H₁₈N₂O₄S)weigh more or less than one mole of the antibiotic streptomycin (C₂₁H₃₉N₇O₁₂)?

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Reactions: Energy, Rates, and Equilibrium

Changes of State and Gas Laws

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Exam 5: Chemical Quantities and Introduction to Reactions

Which of the following is a consideration in the design of air bags?

The following chemical equation, the decomposition of hydrogen peroxide to water, is not balanced.What must be done to the equation to make it balanced? 2 H2O2(l)→ 2 H2O(l)

Which of the following reactions is NOT balanced?

Which of the following must occur for there to be a chemical reaction?

Under what circumstances is mass conserved?

What does it mean for a chemical equation to be balanced?

Jane Doe has a cholesterol (C27H46O)count of 178 mg/dL.You would like to calculate the number of cholesterol molecules that Jane Doe has in each deciliter of blood.Which of the following unit conversions are required to calculate the number of cholesterol molecules per deciliter? i. II. III. IV.

What is the primary relationship between a chemical reaction and a chemical equation?

In an oxidation-reduction reaction, the species that gains electrons is _______.

The balanced equation for the combustion of propane is given below.What do the numbers in front of the molecules (the coefficients)mean? C3H8 + 5 O2 → 3 CO2 + 4 H2O

How many moles of carbon are in 27.1 g of carbon?

The balanced chemical equation for the combustion of propane (C3H8)is given below.How many grams of carbon dioxide (CO2)are released when 35 g of propane are burned in the presence of excess oxygen? C3H8 + 5 O2 → 3 CO2 + 4 H2O

How many atoms of oxygen are present in the reactants of this chemical equation? Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

Is methane (CH4)undergoing oxidation or reduction during this reaction, and how can you tell? CH4 + 2 O2 → CO2 + 2 H2O

A chemical reaction involves many changes but not everything changes during a reaction.Which of the following is NOT a change that occurs during a chemical reaction?

Which statement describes how molecular mass and molar mass differ?

What type of reaction is the addition of hydrochloric acid (HCl)to propene?

Which of the following is NOT indicated by a chemical equation?

Which of the following correctly determines the formula mass of sodium sulfate (Na2SO4)?

Does one mole of the antibiotic penicillin G (C16H18N2O4S)weigh more or less than one mole of the antibiotic streptomycin (C21H39N7O12)?

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Reactions: Energy, Rates, and Equilibrium

Changes of State and Gas Laws

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

The following chemical equation, the decomposition of hydrogen peroxide to water, is not balanced.What must be done to the equation to make it balanced? 2 H₂O₂(l)→ 2 H₂O(l)

The balanced equation for the combustion of propane is given below.What do the numbers in front of the molecules (the coefficients)mean? C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

The balanced chemical equation for the combustion of propane (C₃H₈)is given below.How many grams of carbon dioxide (CO₂)are released when 35 g of propane are burned in the presence of excess oxygen? C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

How many atoms of oxygen are present in the reactants of this chemical equation? Mg(OH)₂ + 2 HCl → MgCl₂ + 2 H₂O

Is methane (CH₄)undergoing oxidation or reduction during this reaction, and how can you tell? CH₄ + 2 O₂ → CO₂ + 2 H₂O

Which of the following correctly determines the formula mass of sodium sulfate (Na₂SO₄)?

Does one mole of the antibiotic penicillin G (C₁₆H₁₈N₂O₄S)weigh more or less than one mole of the antibiotic streptomycin (C₂₁H₃₉N₇O₁₂)?