Question 1

What is the meaning of the arrow in the following chemical equation?

Accepted Answer

A)  The reaction mixture increases in temperature. 
B)  A product is substituted for a reactant. 
C)  The reactants collide. 
D)  The reactants are transformed into the products. 
E)  The reaction is heated.

Question 2

A common, over-the-counter antacid is Al(OH)3.This antacid reacts with gastric juice (HCl)in the stomach, producing AlCl3 and H2O.Which of the following equations can be used to correctly determine how much gastric juice (HCl)reacts with an antacid tablet containing 0.25 grams Al(OH)3? Note that you will need to write a balanced chemical equation to answer this question.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 3

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.

Question 4

Cellular respiration is an example of a(n)___________ reaction.

Accepted Answer

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

Question 5

A molecule of oxygen, O2, has a molar mass of 32.00 g/mol.What is the mass of 4.52 × 1023 O2 molecules?

Accepted Answer

A)  24 g 
B)  5.52 × 1023 amu 
C)  5.52 × 1023 g 
D)  0.75 g 
E)  0.23 g

Question 6

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 × 10-26 
B)  0.022 
C)  1.32 × 1022 
D)  6.02 × 1023 
E)  2.7 × 1025

Question 7

What are the products of the reaction illustrated in Figure I? ​

Accepted Answer

A)  CH4 and O2 
B)  CO2 and H2O 
C)  CH4 only 
D)  O2 only 
E)  CO2 only

Question 8

Pentane (C5H12)reacts with oxygen gas (O2)to form carbon dioxide (CO2)and water (H2O)according to the following reaction.What is the coefficient for oxygen in the balanced equation? C5H12 + ?O2 → ?CO2 + ?H2O

Accepted Answer

A)  2 
B)  4 
C)  5 
D)  6 
E)  8

Question 9

Which of the following statements describes the processes that can occur during reduction? I.Loss of electrons
II)Gain of electrons
III)Loss of oxygens
IV)Loss of hydrogens

Accepted Answer

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

Question 10

In the body, glucose is broken down in the presence of oxygen into carbon dioxide and water.The balanced chemical equation for this reaction is shown below.According to this equation, how many molecules of carbon dioxide are produced when three molecules of glucose are metabolized in the presence of 18 moles of oxygen? ​
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Accepted Answer

A)  0 
B)  6 
C)  12 
D)  18 
E)  24

Question 11

Which statement BEST describes the changes that occur over the course of the following oxidation-reduction reaction? Fe + Cu2+ → Fe2+ + Cu

Accepted Answer

A)  Two electrons are lost. 
B)  Iron changes into copper. 
C)  Iron transfers two electrons to copper. 
D)  Copper transfers two electrons to iron. 
E)  Two electrons are gained.

Question 12

Which of the following is NOT one of the basic types of reactions?

Accepted Answer

A)  ionic 
B)  combination 
C)  decomposition 
D)  single replacement 
E)  double replacement

Question 13

Which statement BEST describes why we use moles when measuring quantities of atoms and molecules?

Accepted Answer

A)  Moles are used because they are units of mass. 
B)  Moles are used because a mole is the same as the atomic mass of an element. 
C)  Moles are used because atoms and molecules are too small to measure singly. 
D)  Moles are used because atoms and molecules exist in units of moles. 
E)  Moles are not involved in measuring quantities of atoms and molecules.

Question 14

Which of the figures violates the conservation of mass? ​

Accepted Answer

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

Question 15

In which figure are new O-H bonds being formed? ​

Accepted Answer

A)  Figure I 
B)  Figure II 
C)  Figure III 
D)  Figures I and II 
E)  Figures I and III

Question 16

Which of the following characteristics is NOT shared by all combustion reactions?

Accepted Answer

A)  They occur in a combustion engine. 
B)  They require oxygen. 
C)  They release water and carbon dioxide. 
D)  They give off heat. 
E)  They are a type of oxidation-reduction reaction.

Question 17

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 calculations is used to solve this problem?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 18

Which of the following equations is used to convert 91.0 milligrams of urea (CH4N2O)to moles of urea?

Accepted Answer

A)    
B)   
C)   
D)   
E)

Question 19

The following reaction is the formation of a peptide from two amino acids, the sort of reaction that occurs in the body as part of the synthesis of proteins.This reaction is missing a component.Which of the following is missing? 2 NH2CH2COOH → NH2CH2CONHCH2COOH

Accepted Answer

A)  Nothing is missing. 
B)  H2O is missing from the reactant side of the equation. 
C)  H2O is missing from the product side of the equation. 
D)  O2 is missing from the reactant side of the equation. 
E)  O2 is missing from the product side of the equation.

Question 20

The only strong acid produced by the body is ______.

Accepted Answer

A)  The body does not produce any strong acids. 
B)  H2SO4 
C)  HNO3 
D)  H3PO4 
E)  HCl

Exam 5: Chemical Quantities and Introduction to Reactions

What is the meaning of the arrow in the following chemical equation?

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

Cellular respiration is an example of a(n) ___________ reaction.

A molecule of oxygen, O₂, has a molar mass of 32.00 g/mol.What is the mass of 4.52 × 10²³ O₂ molecules?

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?

What are the products of the reaction illustrated in Figure I?

Pentane (C₅H₁₂) reacts with oxygen gas (O₂) to form carbon dioxide (CO₂) and water (H₂O) according to the following reaction.What is the coefficient for oxygen in the balanced equation? C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O

Which of the following statements describes the processes that can occur during reduction? I.Loss of electrons II) Gain of electrons III) Loss of oxygens IV) Loss of hydrogens

Which statement BEST describes the changes that occur over the course of the following oxidation-reduction reaction? Fe + Cu²⁺ → Fe²⁺ + Cu

Which of the following is NOT one of the basic types of reactions?

Which statement BEST describes why we use moles when measuring quantities of atoms and molecules?

Which of the figures violates the conservation of mass?

In which figure are new O-H bonds being formed?

Which of the following characteristics is NOT shared by all combustion reactions?

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 calculations is used to solve this problem?

Which of the following equations is used to convert 91.0 milligrams of urea (CH₄N₂O) to moles of urea?

The following reaction is the formation of a peptide from two amino acids, the sort of reaction that occurs in the body as part of the synthesis of proteins.This reaction is missing a component.Which of the following is missing? 2 NH₂CH₂COOH → NH₂CH₂CONHCH₂COOH

The only strong acid produced by the body is ______.

Exam 5: Chemical Quantities and Introduction to Reactions

What is the meaning of the arrow in the following chemical equation?

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

Cellular respiration is an example of a(n) ___________ reaction.

A molecule of oxygen, O2, has a molar mass of 32.00 g/mol.What is the mass of 4.52 × 1023 O2 molecules?

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?

What are the products of the reaction illustrated in Figure I? ​

Pentane (C5H12) reacts with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction.What is the coefficient for oxygen in the balanced equation? C5H12 + ?O2 → ?CO2 + ?H2O

Which of the following statements describes the processes that can occur during reduction? I.Loss of electrons II) Gain of electrons III) Loss of oxygens IV) Loss of hydrogens

Which statement BEST describes the changes that occur over the course of the following oxidation-reduction reaction? Fe + Cu2+ → Fe2+ + Cu

Which of the following is NOT one of the basic types of reactions?

Which statement BEST describes why we use moles when measuring quantities of atoms and molecules?

Which of the figures violates the conservation of mass? ​

In which figure are new O-H bonds being formed? ​

Which of the following characteristics is NOT shared by all combustion reactions?

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 calculations is used to solve this problem?

Which of the following equations is used to convert 91.0 milligrams of urea (CH4N2O) to moles of urea?

The following reaction is the formation of a peptide from two amino acids, the sort of reaction that occurs in the body as part of the synthesis of proteins.This reaction is missing a component.Which of the following is missing? 2 NH2CH2COOH → NH2CH2CONHCH2COOH

The only strong acid produced by the body is ______.

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

A molecule of oxygen, O₂, has a molar mass of 32.00 g/mol.What is the mass of 4.52 × 10²³ O₂ molecules?

What are the products of the reaction illustrated in Figure I?

Pentane (C₅H₁₂) reacts with oxygen gas (O₂) to form carbon dioxide (CO₂) and water (H₂O) according to the following reaction.What is the coefficient for oxygen in the balanced equation? C₅H₁₂ + ?O₂ → ?CO₂ + ?H₂O

Which statement BEST describes the changes that occur over the course of the following oxidation-reduction reaction? Fe + Cu²⁺ → Fe²⁺ + Cu

Which of the figures violates the conservation of mass?

In which figure are new O-H bonds being formed?

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 calculations is used to solve this problem?

Which of the following equations is used to convert 91.0 milligrams of urea (CH₄N₂O) to moles of urea?

The following reaction is the formation of a peptide from two amino acids, the sort of reaction that occurs in the body as part of the synthesis of proteins.This reaction is missing a component.Which of the following is missing? 2 NH₂CH₂COOH → NH₂CH₂CONHCH₂COOH