Question 1

Please refer to Figure 2.1 to answer the following questions.

-Which drawing depicts an atom that is inert or chemically unreactive?

Accepted Answer

The answer of Please refer to Figure 2.1 to answer...

Question 2

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions.

-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)  5
D)  7
E)  9F) A) and B)
G) B) and D)

Question 3

What results from an unequal sharing of electrons between atoms?

Accepted Answer

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

Question 4

How do isotopes of the same element differ from each other?

Accepted Answer

A)  number of protons
B)  number of electrons
C)  number of neutrons
D)  valence electron distribution
E)  amount of radioactivityF) A) and E)
G) B) and E)

Question 5

When two atoms are equally electronegative, they will interact to form

Accepted Answer

A)  equal numbers of isotopes.
B)  ions.
C)  polar covalent bonds.
D)  nonpolar covalent bonds.
E)  ionic bonds.F) C) and D)
G) A) and D)

Question 6

Draw Lewis structures for each hypothetical molecule shown below, using the correct number of valence electrons for each atom. Determine which molecule makes sense because each atom has a complete valence shell and each bond has the correct number of electrons. Explain what makes the other molecules nonsensical, considering the number of bonds each type of atom can make.
 a. $\quad \mathrm { O } = \mathrm { C } - \mathrm { H }$

c.

b.

d.

Accepted Answer

The answer of Draw Lewis structures for each hypothetical molecule...

Question 7

Please refer to Figure 2.1 to answer the following questions.

-Which drawing depicts the electron configuration of oxygen ( $\begin{array} { r } 
16 \
8
\end{array}$ O)?

Accepted Answer

The answer of Please refer to Figure 2.1 to answer...

Question 8

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

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) A) and C)

Question 9

Which statement is True of all atoms that are anions?

Accepted Answer

A)  The atom has more electrons than protons.
B)  The atom has more protons than electrons.
C)  The atom has fewer protons than does a neutral atom of the same element.
D)  The atom has more neutrons than protons.
E)  The net charge is 12.F) A) and B)
G) A) and D)

Question 10

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions.

-How many electrons does an atom of sulfur have in its valence shell?

Accepted Answer

A)  4
B)  6
C)  8
D)  16
E)  32F) C) and D)
G) B) and D)

Question 11

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?

Accepted Answer

A)  nitrogen
B)  calcium
C)  iodine
D)  sodium
E)  phosphorusF) A) and B)
G) D) and E)

Question 12

Refer to the following figure to answer the following questions.
 
-The molecule shown here is the simplest of organic compounds. It is called

Accepted Answer

A)  a carbohydrate.
B)  carbon dioxide.
C)  methane.
D)  carbonic hydrate.
E)  methyl carbonate.F) A) and B)
G) A) and C)

Question 13

Which of the following would be regarded as compounds?

Accepted Answer

A)  H₂
B)  H₂O
C)  O₂
D)  CH₄
E)  B and D, but not A and CF) A) and B)
G) D) and E)

Question 14

In the term trace element, the modifier trace means

Accepted Answer

A)  the element is required in very small amounts.
B)  the element can be used as a label to trace atoms through an organism's metabolism.
C)  the element is very rare on Earth.
D)  the element enhances health but is not essential for the organism's long-term survival.
E)  the element passes rapidly through the organism.F) A) and E)
G) A) and C)

Question 15

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions.

-What is the valence of an atom with six electrons in its outer electron shell?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) B) and D)
G) C) and D)

Question 16

Please refer to Figure 2.1 to answer the following questions.

-Atoms whose outer electron shells contain eight electrons tend to

Accepted Answer

A)  form ionic bonds in aqueous solutions.
B)  form covalent bonds in aqueous solutions.
C)  be stable and chemically nonreactive, or inert.
D)  be unstable and chemically very reactive.
E)  be isotopes and very radioactive.F) A) and E)
G) B) and C)

Question 17

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

Accepted Answer

A)  HS
B)  HS₂
C)  H₂S
D)  H₃S₂
E)  H₄SF) B) and D)
G) C) and D)

Question 18

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions.

-How many neutrons are present in the nucleus of a phosphorus atom?

Accepted Answer

A)  8
B)  15
C)  16
D)  31
E)  46F) D) and E)
G) A) and E)

Question 19

The following questions refer to Figure 2.3.

-What results from the chemical reaction illustrated in Figure 2.3?

Accepted Answer

A)  a cation with a net charge of +1
B)  a cation with a net charge of -1
C)  an anion with a net charge of +1
D)  an anion with a net charge of -1
E)  A and DF) A) and E)
G) D) and E)

Question 20

Refer to the following figure to answer the following questions.
 
-Which one of the atoms shown would be most likely to form an anion with a charge of -1?

Accepted Answer

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

Exam 2: The Chemical Context of Life

Which statement is True of all atoms that are anions?

Correct Answer
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Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -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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Please refer to Figure 2.1 to answer the following questions. -Which drawing depicts an atom that is inert or chemically unreactive?

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

Correct Answer
verified

When two atoms are equally electronegative, they will interact to form

Correct Answer
verified

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?

Correct Answer
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The following questions refer to Figure 2.3. -What results from the chemical reaction illustrated in Figure 2.3?

Correct Answer
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Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -How many neutrons are present in the nucleus of a phosphorus atom?

Correct Answer
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Refer to the following figure to answer the following questions. -Which one of the atoms shown would be most likely to form an anion with a charge of -1?

Correct Answer
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How do isotopes of the same element differ from each other?

Correct Answer
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Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -What is the valence of an atom with six electrons in its outer electron shell?

Correct Answer
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Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -How many electrons does an atom of sulfur have in its valence shell?

Correct Answer
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What results from an unequal sharing of electrons between atoms?

Correct Answer
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Please refer to Figure 2.1 to answer the following questions. -Atoms whose outer electron shells contain eight electrons tend to

Correct Answer
verified

Refer to the following figure to answer the following questions. -The molecule shown here is the simplest of organic compounds. It is called

Correct Answer
verified

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

Correct Answer
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Which of the following would be regarded as compounds?

Correct Answer
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In the term trace element, the modifier trace means

Correct Answer
verified

Exam 2: The Chemical Context of Life

Which statement is True of all atoms that are anions?

Correct AnswerverifiedShow Answer

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -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

Please refer to Figure 2.1 to answer the following questions. -Which drawing depicts an atom that is inert or chemically unreactive?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When two atoms are equally electronegative, they will interact to form

Correct AnswerverifiedShow Answer

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?

Correct AnswerverifiedShow Answer

The following questions refer to Figure 2.3. -What results from the chemical reaction illustrated in Figure 2.3?

Correct AnswerverifiedShow Answer

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -How many neutrons are present in the nucleus of a phosphorus atom?

Correct AnswerverifiedShow Answer

Refer to the following figure to answer the following questions. -Which one of the atoms shown would be most likely to form an anion with a charge of -1?

Correct AnswerverifiedShow Answer

How do isotopes of the same element differ from each other?

Correct AnswerverifiedShow Answer

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -What is the valence of an atom with six electrons in its outer electron shell?

Correct AnswerverifiedShow Answer

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -How many electrons does an atom of sulfur have in its valence shell?

Correct AnswerverifiedShow Answer

What results from an unequal sharing of electrons between atoms?

Correct AnswerverifiedShow Answer

Please refer to Figure 2.1 to answer the following questions. -Atoms whose outer electron shells contain eight electrons tend to

Correct AnswerverifiedShow Answer

Refer to the following figure to answer the following questions. -The molecule shown here is the simplest of organic compounds. It is called

Correct AnswerverifiedShow Answer

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Please refer to Figure 2.1 to answer the following questions. -Which drawing depicts the electron configuration of oxygen ( 168\begin{array} { r } 16 \\8\end{array}168​ O)?

Correct AnswerverifiedShow Answer

Which of the following would be regarded as compounds?

Correct AnswerverifiedShow Answer

In the term trace element, the modifier trace means

Correct AnswerverifiedShow Answer

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