Question 1

Use the following figure to answer the questions below.
 
-Which drawing in the figure above depicts the electron configuration of an atom that can form covalent bonds with two hydrogen atoms?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) A) and C)
G) B) and E)

Question 2

What is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  6F) C) and E)
G) A) and C)

Question 3

Use the following figure to answer the questions below.
 
-Based on electron configuration, which of these elements in the figure above would exhibit a chemical behaviour most like that of oxygen?

Accepted Answer

A)  carbon
B)  hydrogen
C)  nitrogen
D)  sulphur
E)  phosphorusF) C) and D)
G) None of the above

Question 4

Use the following figure to answer the questions below.
 
-What is the atomic number of the cation formed in the reaction illustrated above?

Accepted Answer

A)  1
B)  8
C)  10
D)  11
E)  16F) A) and E)
G) B) and C)

Question 5

What is the difference between covalent bonds and ionic bonds?

Accepted Answer

A)  Covalent bonds are formed between atoms to form molecules; ionic bonds are formed between atoms to form compounds.
B)  Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms.
C)  Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.
D)  Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between atoms.
E)  Covalent bonds involve the transfer of electrons between atoms; ionic bonds involve the sharing of electrons between atoms.F) B) and C)
G) C) and D)

Question 6

One difference between carbon-12 (  ) and carbon-14 (  ) is that carbon-14 has

Accepted Answer

A)  two more protons than carbon-12.
B)  two more electrons than carbon-12.
C)  two more neutrons than carbon-12.
D)  two more protons and two more neutrons than carbon-12.
E)  two more electrons and two more neutrons than carbon-12.F) A) and C)
G) A) and D)

Question 7

-The illustration above shows a representation of formic acid. A formic acid molecule

Accepted Answer

A)  will form hydrogen bonds with water molecules.
B)  has a tetrahedral configuration of hybrid electron orbitals for the carbon atom.
C)  consists of largely nonpolar covalent bonds.
D)  is held together by hydrogen bonds.
E)  has a tetrahedral shape and will form hydrogen bonds with water molecules.F) A) and E)
G) None of the above

Question 8

Use the following figure to answer the questions below.
 
-Which drawing in the figure above is of the electron configuration of a sodium 11Na⁺ ion?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) C) and D)
G) None of the above

Question 9

Fluorine has an atomic number of 9 and a mass number of 19. How many electrons are needed to complete the valence shell of a fluorine atom?

Accepted Answer

A)  1
B)  3
C)  0
D)  7
E)  9F) B) and C)
G) C) and E)

Question 10

Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic mass of an oxygen atom?

Accepted Answer

A)  exactly 8 grams
B)  exactly 8 daltons
C)  approximately 16 grams
D)  approximately 16 daltons
E)  24 amu (atomic mass units) F) A) and B)
G) B) and E)

Question 11

Which of the following explains most specifically the attraction of water molecules to one another?

Accepted Answer

A)  nonpolar covalent bond
B)  polar covalent bond
C)  ionic bond
D)  hydrogen bond
E)  hydrophobic interactionF) B) and C)
G) A) and C)

Question 12

Which of the following is true for this reaction? 3 H₂ + N₂ ↔ 2 NH₃

Accepted Answer

A)  The reaction is nonreversible.
B)  Hydrogen and nitrogen are the reactants of the reverse reaction.
C)  Hydrogen and nitrogen are the products of the forward reaction.
D)  Ammonia is being formed and decomposed.
E)  Hydrogen and nitrogen are being decomposed.F) B) and D)
G) C) and D)

Question 13

Use the following information to answer the questions below.
You are investigating how chemical reactions occur. You place two reactants together and measure the concentration of product at regular intervals. After a time, the amount of product becomes stable.
-The atomic number of sulphur is 16. Sulphur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulphur atom, predict the molecular formula of the compound.

Accepted Answer

A)  HS
B)  HS₂
C)  H₂S
D)  H₃S₂
E)  H₄SF) All of the above
G) B) and C)

Question 14

Use the following information to answer the questions below.
You are investigating how chemical reactions occur. You place two reactants together and measure the concentration of product at regular intervals. After a time, the amount of product becomes stable.
-If you add more product to the solution, you would expect to see

Accepted Answer

A)  a precipitation of the product.
B)  an increase in pH.
C)  the reactant concentration to remain the same.
D)  the reactant concentration to decrease.
E)  the reactant concentration to increase.F) B) and C)
G) All of the above

Question 15

Knowing just the atomic mass of an element allows inferences about which of the following?

Accepted Answer

A)  the chemical properties of the element
B)  the number of protons in the element
C)  the number of neutrons in the element
D)  the number of protons plus neutrons in the element
E)  both the number of protons and the chemical properties of the elementF) A) and C)
G) C) and E)

Question 16

The atomic number of nitrogen is 7. Nitrogen-15 is heavier than nitrogen-14 because the atomic nucleus of nitrogen-15 contains how many neutrons?

Accepted Answer

A)  6
B)  7
C)  8
D)  12
E)  14F) A) and B)
G) A) and C)

Question 17

What factors are most important in determining which elements are most common in living matter?

Accepted Answer

A)  the relative abundances of the elements in Earth's crust and atmosphere
B)  the emergent properties of the simple compounds made from these elements
C)  the reactivity of the elements with water
D)  the chemical stability of the elements
E)  both the relative abundances of the elements and the emergent properties of the compounds made from these elementsF) A) and B)
G) All of the above

Question 18

Which of the following is not considered to be a weak molecular interaction?

Accepted Answer

A)  a covalent bond
B)  a van der Waals interaction
C)  an ionic bond in the presence of water
D)  a hydrogen bond
E)  both a hydrogen bond and a covalent bondF) C) and E)
G) C) and D)

Question 19

The three types of subatomic particles pertinent to the study of biology are

Accepted Answer

A)  electrons, protons, and neutrinos.
B)  electrons, positrons, and neutrons.
C)  electrons, protons, and neutrons.
D)  electrons, photons, and neutrons.
E)  quarks, photons, and gravitons.F) B) and E)
G) C) and D)

Question 20

Two atoms appear to have the same mass number. These atoms

Accepted Answer

A)  must have the same atomic number.
B)  must have the same number of electrons.
C)  must have the same chemical properties.
D)  must have the same number of protons + neutrons.
E)  must have the same atomic number, the same number of protons + neutrons, the same number of electrons, and the same chemical properties.F) C) and D)
G) A) and D)

Exam 2: The Chemical Context of Life

Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic mass of an oxygen atom?

Correct Answer
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Knowing just the atomic mass of an element allows inferences about which of the following?

Correct Answer
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Use the following figure to answer the questions below. -Which drawing in the figure above depicts the electron configuration of an atom that can form covalent bonds with two hydrogen atoms?

Correct Answer
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Fluorine has an atomic number of 9 and a mass number of 19. How many electrons are needed to complete the valence shell of a fluorine atom?

Correct Answer
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What is the difference between covalent bonds and ionic bonds?

Correct Answer
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What factors are most important in determining which elements are most common in living matter?

Correct Answer
verified

Which of the following is not considered to be a weak molecular interaction?

Correct Answer
verified

Which of the following explains most specifically the attraction of water molecules to one another?

Correct Answer
verified

Which of the following is true for this reaction? 3 H₂ + N₂ ↔ 2 NH₃

Correct Answer
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The atomic number of nitrogen is 7. Nitrogen-15 is heavier than nitrogen-14 because the atomic nucleus of nitrogen-15 contains how many neutrons?

Correct Answer
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What is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?

Correct Answer
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Use the following figure to answer the questions below. -Based on electron configuration, which of these elements in the figure above would exhibit a chemical behaviour most like that of oxygen?

Correct Answer
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Correct Answer
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-The illustration above shows a representation of formic acid. A formic acid molecule

Correct Answer
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One difference between carbon-12 ( ) and carbon-14 ( ) is that carbon-14 has

Correct Answer
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Use the following figure to answer the questions below. -Which drawing in the figure above is of the electron configuration of a sodium 11Na⁺ ion?

Correct Answer
verified

Use the following figure to answer the questions below. -What is the atomic number of the cation formed in the reaction illustrated above?

Correct Answer
verified

The three types of subatomic particles pertinent to the study of biology are

Correct Answer
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Two atoms appear to have the same mass number. These atoms

Correct Answer
verified

Correct Answer
verified

Exam 2: The Chemical Context of Life

Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic mass of an oxygen atom?

Correct AnswerverifiedShow Answer

Knowing just the atomic mass of an element allows inferences about which of the following?

Correct AnswerverifiedShow Answer

Use the following figure to answer the questions below. -Which drawing in the figure above depicts the electron configuration of an atom that can form covalent bonds with two hydrogen atoms?

Correct AnswerverifiedShow Answer

Fluorine has an atomic number of 9 and a mass number of 19. How many electrons are needed to complete the valence shell of a fluorine atom?

Correct AnswerverifiedShow Answer

What is the difference between covalent bonds and ionic bonds?

Correct AnswerverifiedShow Answer

What factors are most important in determining which elements are most common in living matter?

Correct AnswerverifiedShow Answer

Which of the following is not considered to be a weak molecular interaction?

Correct AnswerverifiedShow Answer

Which of the following explains most specifically the attraction of water molecules to one another?

Correct AnswerverifiedShow Answer

Which of the following is true for this reaction? 3 H₂ + N₂ ↔ 2 NH₃

Correct AnswerverifiedShow Answer

The atomic number of nitrogen is 7. Nitrogen-15 is heavier than nitrogen-14 because the atomic nucleus of nitrogen-15 contains how many neutrons?

Correct AnswerverifiedShow Answer

What is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?

Correct AnswerverifiedShow Answer

Use the following figure to answer the questions below. -Based on electron configuration, which of these elements in the figure above would exhibit a chemical behaviour most like that of oxygen?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

-The illustration above shows a representation of formic acid. A formic acid molecule

Correct AnswerverifiedShow Answer

One difference between carbon-12 ( ) and carbon-14 ( ) is that carbon-14 has

Correct AnswerverifiedShow Answer

Use the following figure to answer the questions below. -Which drawing in the figure above is of the electron configuration of a sodium 11Na⁺ ion?

Correct AnswerverifiedShow Answer

Use the following figure to answer the questions below. -What is the atomic number of the cation formed in the reaction illustrated above?

Correct AnswerverifiedShow Answer

The three types of subatomic particles pertinent to the study of biology are

Correct AnswerverifiedShow Answer

Two atoms appear to have the same mass number. These atoms

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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