Question 1

Which of the figures violates the conservation of mass?

Accepted Answer

A)  All of these figures violate the conservation of mass. 
B)  Figure I violates the conservation of mass. 
C)  Figure II violates the conservation of mass. 
D)  Figure III violates the conservation of mass. 
E)  Figures II and III both violate the conservation of mass. 
A)  All of these figures violate the conservation of mass. 
B)  Figure I violates the conservation of mass. 
C)  Figure II violates the conservation of mass. 
D)  Figure III violates the conservation of mass. 
E)  Figures II and III both violate the conservation of mass.

Question 2

When bonds break, energy is

Accepted Answer

A)  always released. 
B)  always absorbed. 
C)  typically released, but sometimes absorbed. 
D)  typically absorbed, but sometimes released. 
E)  absorbed half the time and released half the time. 
A)  always released. 
B)  always absorbed. 
C)  typically released, but sometimes absorbed. 
D)  typically absorbed, but sometimes released. 
E)  absorbed half the time and released half the time.

Question 3

An infant dose of acetaminophen (C8H9NO2) is 0.080

Accepted Answer

A)  5.3 F1F1F1S1F1F1F10 10-4 molecules 
B)  3.2 F1F1F1S1F1F1F10 1020 molecules 
C)  7.2 F1F1F1S1F1F1F10 1023 molecules 
D)  1.2 molecules 
E)  2 F1F1F1S1F1F1F10 10-24 molecules 
A)  5.3 F1F1F1S1F1F1F10 10-4 molecules 
B)  3.2 F1F1F1S1F1F1F10 1020 molecules 
C)  7.2 F1F1F1S1F1F1F10 1023 molecules 
D)  1.2 molecules 
E)  2 F1F1F1S1F1F1F10 10-24 molecules

Question 4

Bond breaking is always endothermic and yet catabolism, the breakdown of nutrients, is an overall exothermic process. How can you reconcile these two statements?

Accepted Answer

A)  Catabolism is an exception to the rule. 
B)  Bond breaking is not really always endothermic. 
C)  Endothermic bond breaking is only seen in the laboratory. 
D)  No one really understands this. 
E)  Catabolism is the sum of many reactions, including many bond-making reactions. 
A)  Catabolism is an exception to the rule. 
B)  Bond breaking is not really always endothermic. 
C)  Endothermic bond breaking is only seen in the laboratory. 
D)  No one really understands this. 
E)  Catabolism is the sum of many reactions, including many bond-making reactions.

Question 5

Which of the following transformations is a chemical reaction?

Accepted Answer

A)  water boiling 
B)  burning wood 
C)  condensation on the outside of a water glass 
D)  dry ice changing from a solid to a gas 
E)  All of the above 
A)  water boiling 
B)  burning wood 
C)  condensation on the outside of a water glass 
D)  dry ice changing from a solid to a gas 
E)  All of the above

Question 6

Below are several statements. Which of these statements apply to chemical reactions?

I. A chemical reaction always involves two reactants.
II. Physical changes are a type of chemical reaction.
III. Energy changes are involved in chemical reactions.
IV. Atoms are gained and lost during a chemical reaction.
V. Bonds are broken and new bonds formed during a chemical reaction.

Accepted Answer

A)  All of these statements apply to chemical reactions. 
B)  Only I applies to chemical reactions. 
C)  I, II, and III all apply to chemical reactions. 
D)  IV and V both apply to chemical reactions. 
E)  III and V both apply to chemical reactions. 
A)  All of these statements apply to chemical reactions. 
B)  Only I applies to chemical reactions. 
C)  I, II, and III all apply to chemical reactions. 
D)  IV and V both apply to chemical reactions. 
E)  III and V both apply to chemical reactions.

Question 7

Arsenic poisoning is a serious problem in Bangladesh, China, and Chile, resulting from contaminated well water. When arsenic poisoning occurs, arsenic binds to proteins and eventually causes cellular damage. This leads to a variety of symptoms in humans including exhaustion, muscle weakness, organ failure, and cancer. Arsenic poisoning is commonly treated with a drug called dimercaprol (or BAL) that binds arsenic. This process sets up a competing equilibrium within the body. Once arsenic reacts to form a complex with BAL, it can be excreted from the body. How does treatment with BAL affect the equilibrium shown below? Arsenic-protein complex   Arsenic + proteins + BAL   Arsenic-BAL complex

Accepted Answer

A)  Adding BAL does not affect the equilibrium. 
B)  Adding BAL pushes the reaction to the left. 
C)  Adding BAL pushes the reaction to the right. 
D)  Adding BAL causes less arsenic-BAL to be made. 
E)  Adding BAL causes more arsenic-protein complex to be made. 
A)  Adding BAL does not affect the equilibrium. 
B)  Adding BAL pushes the reaction to the left. 
C)  Adding BAL pushes the reaction to the right. 
D)  Adding BAL causes less arsenic-BAL to be made. 
E)  Adding BAL causes more arsenic-protein complex to be made.

Question 8

How many grams of iron are in 1.28 moles of iron?

Accepted Answer

A)  0.0230 g 
B)  20.3 g 
C)  33.3 g 
D)  43.6 g 
E)  71.4 g 
A)  0.0230 g 
B)  20.3 g 
C)  33.3 g 
D)  43.6 g 
E)  71.4 g

Question 9

The enthalpy for the reaction described by the energy diagram below is

Accepted Answer

A)  very large. 
B)  greater than zero, but not necessarily very large. 
C)  exactly zero. 
D)  less than zero. 
E)  It is not possible to predict anything about the enthalpy of this equation. 
A)  very large. 
B)  greater than zero, but not necessarily very large. 
C)  exactly zero. 
D)  less than zero. 
E)  It is not possible to predict anything about the enthalpy of this equation.

Question 10

If Jane Doe has a blood carbon dioxide concentration of 0.022 mol/L, how many carbon dioxide molecules are in each liter of her blood?

Accepted Answer

A)  3.7 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F1026 
B)  0.022 
C)  1.32 F1F1F1S1F1F1F10 1022 
D)  6.02 F1F1F1S1F1F1F10 1023 
E)  2.7 F1F1F1S1F1F1F10 1025 
A)  3.7 F1F1F1S1F1F1F10 10F1F1F1S1F1F1F1026 
B)  0.022 
C)  1.32 F1F1F1S1F1F1F10 1022 
D)  6.02 F1F1F1S1F1F1F10 1023 
E)  2.7 F1F1F1S1F1F1F10 1025

Question 11

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 12

The reaction of water with ammonia is shown below. Which of the following statements best describes the concentration of ammonia and ammonium at equilibrium?

Accepted Answer

A)  The concentration of ammonium is increasing. 
B)  There is no ammonium at equilibrium. 
C)  Their concentrations are equal. 
D)  Their concentrations are constant. 
E)  There is no ammonia at equilibrium. 
A)  The concentration of ammonium is increasing. 
B)  There is no ammonium at equilibrium. 
C)  Their concentrations are equal. 
D)  Their concentrations are constant. 
E)  There is no ammonia at equilibrium.

Question 13

What are biological catalysts called?

Accepted Answer

A)  proteins 
B)  nucleic acids 
C)  enzymes 
D)  carbohydrates 
E)  lipids 
A)  proteins 
B)  nucleic acids 
C)  enzymes 
D)  carbohydrates 
E)  lipids

Question 14

An exothermic reaction is one that

Accepted Answer

A)  has a positive enthalpy. 
B)  has no enthalpy. 
C)  absorbs heat. 
D)  has products higher in energy than reactants. 
E)  has a negative enthalpy. 
A)  has a positive enthalpy. 
B)  has no enthalpy. 
C)  absorbs heat. 
D)  has products higher in energy than reactants. 
E)  has a negative enthalpy.

Question 15

Which of the following equations best describes how to calculate the molar mass of Mg(OH)2?

Accepted Answer

A)  24.3 g/mole + 16.0 g/mole + 1.01 g/mole 
B)  24.3 g/mole + 16.0 g/mole + (2 F1F1F1S1F1F1F10 1.01 g/mole) 
C)  24.3 g/mole + (2 F1F1F1S1F1F1F10 16.0 g/mole) + 1.01 g/mole 
D)  24.3 g/mole + 2 F1F1F1S1F1F1F10 (16.0 g/mole + 1.01 g/mole) 
E)  2 F1F1F1S1F1F1F10 (24.3 g/mole + 16.0 g/mole + 1.01 g/mole) 
A)  24.3 g/mole + 16.0 g/mole + 1.01 g/mole 
B)  24.3 g/mole + 16.0 g/mole + (2 F1F1F1S1F1F1F10 1.01 g/mole) 
C)  24.3 g/mole + (2 F1F1F1S1F1F1F10 16.0 g/mole) + 1.01 g/mole 
D)  24.3 g/mole + 2 F1F1F1S1F1F1F10 (16.0 g/mole + 1.01 g/mole) 
E)  2 F1F1F1S1F1F1F10 (24.3 g/mole + 16.0 g/mole + 1.01 g/mole)

Question 16

Which of the following reactions could be described by the energy diagram below?

Accepted Answer

A)  2 CO2 + 556 kJ→ 2 CO + O2 
B)  CH4 + 2 O2 → CO2 + 2 H2O + heat 
C)  8 H2S + heat → 8 H2 + S8 
D)  6 CO2 + 6 H2O + heat→ C6H12O6 + 6 O2 
E)  All of the above 
A)  2 CO2 + 556 kJ→ 2 CO + O2 
B)  CH4 + 2 O2 → CO2 + 2 H2O + heat 
C)  8 H2S + heat → 8 H2 + S8 
D)  6 CO2 + 6 H2O + heat→ C6H12O6 + 6 O2 
E)  All of the above

Question 17

Which part of the following energy diagram is changed when a catalyst is added, and how is it changed?

Accepted Answer

A)  I is higher. 
B)  II is higher. 
C)  III is higher. 
D)  I is lower. 
E)  II is lower. 
A)  I is higher. 
B)  II is higher. 
C)  III is higher. 
D)  I is lower. 
E)  II is lower.

Question 18

Coefficients are important components of chemical equations. What is the significance of coefficients in a chemical equation? I. Coefficients indicate the ratio of masses of molecules.
II) Coefficients indicate the ratio of numbers of atoms and molecules.
III) Coefficients indicate the ratio of numbers of moles of molecules and atoms.

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  II and III 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  II and III

Question 19

Is this chemical equation balanced? Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

Accepted Answer

A)  No. The number of magnesiums in the reactants is different from the number in the products. 
B)  No. The number of hydrogens in the reactants is different from the number in the products. 
C)  No. The number of oxygens in the reactants is different from the number in the products. 
D)  No. The number of chlorines in the reactants is different from the number in the products. 
E)  Yes. The same number of each type of atom is present in the reactants and products. 
A)  No. The number of magnesiums in the reactants is different from the number in the products. 
B)  No. The number of hydrogens in the reactants is different from the number in the products. 
C)  No. The number of oxygens in the reactants is different from the number in the products. 
D)  No. The number of chlorines in the reactants is different from the number in the products. 
E)  Yes. The same number of each type of atom is present in the reactants and products.

Question 20

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)  C2H5OH + 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)  C2H5OH + O2 → 2 CO2 + 3 H2O 
E)  CaO + 3 C → CaC2 + CO

Which of the figures violates the conservation of mass?

When bonds break, energy is

An infant dose of acetaminophen (C₈H₉NO₂) is 0.080

Bond breaking is always endothermic and yet catabolism, the breakdown of nutrients, is an overall exothermic process. How can you reconcile these two statements?

Which of the following transformations is a chemical reaction?

How many grams of iron are in 1.28 moles of iron?

The enthalpy for the reaction described by the energy diagram below is

If Jane Doe has a blood carbon dioxide concentration of 0.022 mol/L, how many carbon dioxide molecules are in each liter of her blood?

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 reaction of water with ammonia is shown below. Which of the following statements best describes the concentration of ammonia and ammonium at equilibrium?

What are biological catalysts called?

An exothermic reaction is one that

Which of the following equations best describes how to calculate the molar mass of Mg(OH)₂?

Which of the following reactions could be described by the energy diagram below?

Which part of the following energy diagram is changed when a catalyst is added, and how is it changed?

Is this chemical equation balanced? Mg(OH)₂ + 2 HCl → MgCl₂ + 2 H₂O

Which of the following reactions is NOT balanced?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Exam 4: Chemical Quantities and Chemical Reactions

Which of the figures violates the conservation of mass?

When bonds break, energy is

An infant dose of acetaminophen (C8H9NO2) is 0.080

Bond breaking is always endothermic and yet catabolism, the breakdown of nutrients, is an overall exothermic process. How can you reconcile these two statements?

Which of the following transformations is a chemical reaction?

How many grams of iron are in 1.28 moles of iron?

The enthalpy for the reaction described by the energy diagram below is

If Jane Doe has a blood carbon dioxide concentration of 0.022 mol/L, how many carbon dioxide molecules are in each liter of her blood?

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 reaction of water with ammonia is shown below. Which of the following statements best describes the concentration of ammonia and ammonium at equilibrium?

What are biological catalysts called?

An exothermic reaction is one that

Which of the following equations best describes how to calculate the molar mass of Mg(OH)2?

Which of the following reactions could be described by the energy diagram below?

Which part of the following energy diagram is changed when a catalyst is added, and how is it changed?

Is this chemical equation balanced? Mg(OH)2 + 2 HCl → MgCl2 + 2 H2O

Which of the following reactions is NOT balanced?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

An infant dose of acetaminophen (C₈H₉NO₂) is 0.080

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 equations best describes how to calculate the molar mass of Mg(OH)₂?

Is this chemical equation balanced? Mg(OH)₂ + 2 HCl → MgCl₂ + 2 H₂O