Question 1

The measure of an atom's ability to pull electrons away from another atom is called ____.

Accepted Answer

A)  electronegativity
B)  polarity
C)  charge
D)  concentration
E)  atomic numberF) A) and B)
G) B) and D)

Question 2

The pH of black coffee is about 5, while the pH of lemon juice is about 2. Lemon juice is therefore approximately ____ times more acidic than black coffee.

Accepted Answer

A)  3
B)  2
C)  10
D)  100
E)  1,000F) B) and D)
G) A) and E)

Question 3

Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

Accepted Answer

In these atoms, the outermost ...

Question 4

Match the following terms with the best description.
-a type of molecule that has atoms of two or more elements

Accepted Answer

A)  compound
B)  polarity
C)  electronegativity
D)  ionE) A) and B)
F) C) and D)

Question 5

Match the following terms with the best description.
-a charged atom

Accepted Answer

A)  compound
B)  polarity
C)  electronegativity
D)  ionE) A) and B)
F) B) and C)

Question 6

Match the terms with their most suitable description.
-atomic number

Accepted Answer

A)  number of protons > number of electrons
B)  number of protons in the atomic nucleus
C)  polar; easily dissolves in water
D)  number of protons 
E)  number of protons = number of electronsF) measure of molecular motionG) number of protons and neutrons in the atomic nucleusH) B) and F)
I) A) and E)

Question 7

What is the pH of a solution in which the number of H+ ions equals the number of OH- ions?

Accepted Answer

A)  0-2
B)  3-6
C)  7
D)  8-10
E)  11-14F) A) and E)
G) None of the above

Question 8

Why is pH stability important for homeostasis?

Accepted Answer

A)  There is no mechanism for buffering pH changes in blood.
B)  Excess H+ disrupts hydrogen bonds, thereby destroying the cohesion between water molecules.
C)  Buffers can only work properly within a narrow pH range.
D)  Most biological molecules function optimally only within a narrow pH range.
E)  Excess H+ facilitates hydrogen bonds, which disrupt the structural integrity of biological molecules.F) None of the above
G) A) and E)

Question 9

An atom of which element possesses electrons in only the first and second energy levels? (The number in parentheses indicates the number of electrons in an atom of that element.)

Accepted Answer

A)  sodium (11) 
B)  magnesium (12) 
C)  chlorine (17) 
D)  neon (10) 
E)  argon (18) F) D) and E)
G) C) and D)

Question 10

Match the following terms with the best description.
-an atom's ability to pull electrons away from another atom

Accepted Answer

A)  compound
B)  polarity
C)  electronegativity
D)  ionE) A) and B)
F) None of the above

Question 11

Which type of chemical bond joins the oxygen (atomic number 8)  and carbon (atomic number 6)  atoms in carbon dioxide (CO2) ?

Accepted Answer

A)  single covalent
B)  double covalent
C)  triple covalent
D)  ionic
E)  hydrogenF) A) and B)
G) A) and C)

Question 12

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-sharing of electrons between two atoms

Accepted Answer

A)  ionic bond
B)  covalent bond
C)  hydrogen bondD) A) and B)
E) A) and C)

Question 13

Carbon has several isotopes including 12C and 14C. These isotopes differ in the number of ____.

Accepted Answer

A)  electrons only
B)  neutrons only
C)  protons only
D)  electrons and protons
E)  protons and neutronsF) A) and E)
G) B) and E)

Question 14

For an atom to be electrically neutral, it must have the same number of ____.

Accepted Answer

A)  electrons and neutrons only
B)  electrons and protons only
C)  neutrons and protons only
D)  neutrons only
E)  electrons, neutrons, and protonsF) B) and E)
G) B) and C)

Question 15

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-single, double, or triple bonds can exist between two atoms

Accepted Answer

A)  ionic bond
B)  covalent bond
C)  hydrogen bondD) A) and B)
E) A) and C)

Question 16

Sodium (Na)  atoms often lose the single electron that is in their outermost shell. How does losing the electron affect sodium's charge?

Accepted Answer

A)  It becomes neutral.
B)  It becomes positively charged.
C)  It becomes negatively charged.
D)  Its electronegativity increases.
E)  Its charge is not affected by the loss of an electron.F) D) and E)
G) All of the above

Question 17

Magnesium has 12 protons. How many electrons are in its third energy level?

Accepted Answer

A)  two
B)  four
C)  six
D)  eight
E)  tenF) A) and E)
G) A) and D)

Question 18

All atoms of a given element contain the same number of ____.

Accepted Answer

A)  ions
B)  protons only
C)  neutrons only
D)  electrons and neutrons
E)  protons and neutronsF) B) and C)
G) None of the above

Question 19

Due to their instability, free radicals ____.

Accepted Answer

A)  are excellent solvents in biological systems
B)  are excellent buffers in biological systems
C)  forcibly donate or remove electrons from other molecules
D)  can be used as tracers for clinical diagnostic procedures
E)  will readily form ionic bonds with polar ionsF) A) and D)
G) All of the above

Exam 2: Lifes Chemical Basis

An atom of which element possesses electrons in only the first and second energy levels? (The number in parentheses indicates the number of electrons in an atom of that element.)

Correct Answer
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Magnesium has 12 protons. How many electrons are in its third energy level?

Correct Answer
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Why is pH stability important for homeostasis?

Correct Answer
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Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -single, double, or triple bonds can exist between two atoms

Correct Answer
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Match the following terms with the best description. -a charged atom

Correct Answer
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The pH of black coffee is about 5, while the pH of lemon juice is about 2. Lemon juice is therefore approximately ____ times more acidic than black coffee.

Correct Answer
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Match the following terms with the best description. -an atom's ability to pull electrons away from another atom

Correct Answer
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Due to their instability, free radicals ____.

Correct Answer
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Carbon has several isotopes including ¹²C and ¹⁴C. These isotopes differ in the number of ____.

Correct Answer
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What is the pH of a solution in which the number of H⁺ ions equals the number of OH^- ions?

Correct Answer
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All atoms of a given element contain the same number of ____.

Correct Answer
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Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -sharing of electrons between two atoms

Correct Answer
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Sodium (Na) atoms often lose the single electron that is in their outermost shell. How does losing the electron affect sodium's charge?

Correct Answer
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The measure of an atom's ability to pull electrons away from another atom is called ____.

Correct Answer
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For an atom to be electrically neutral, it must have the same number of ____.

Correct Answer
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Which type of chemical bond joins the oxygen (atomic number 8) and carbon (atomic number 6) atoms in carbon dioxide (CO₂) ?

Correct Answer
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Match the following terms with the best description. -a type of molecule that has atoms of two or more elements

Correct Answer
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Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

Correct Answer
verified
In these atoms, the outermost ...
View Answer

Match the terms with their most suitable description. -atomic number

Correct Answer
verified

Exam 2: Lifes Chemical Basis

An atom of which element possesses electrons in only the first and second energy levels? (The number in parentheses indicates the number of electrons in an atom of that element.)

Correct AnswerverifiedShow Answer

Magnesium has 12 protons. How many electrons are in its third energy level?

Correct AnswerverifiedShow Answer

Why is pH stability important for homeostasis?

Correct AnswerverifiedShow Answer

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -single, double, or triple bonds can exist between two atoms

Correct AnswerverifiedShow Answer

Match the following terms with the best description. -a charged atom

Correct AnswerverifiedShow Answer

The pH of black coffee is about 5, while the pH of lemon juice is about 2. Lemon juice is therefore approximately ____ times more acidic than black coffee.

Correct AnswerverifiedShow Answer

Match the following terms with the best description. -an atom's ability to pull electrons away from another atom

Correct AnswerverifiedShow Answer

Due to their instability, free radicals ____.

Correct AnswerverifiedShow Answer

Carbon has several isotopes including 12C and 14C. These isotopes differ in the number of ____.

Correct AnswerverifiedShow Answer

What is the pH of a solution in which the number of H+ ions equals the number of OH- ions?

Correct AnswerverifiedShow Answer

All atoms of a given element contain the same number of ____.

Correct AnswerverifiedShow Answer

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -sharing of electrons between two atoms

Correct AnswerverifiedShow Answer

Sodium (Na) atoms often lose the single electron that is in their outermost shell. How does losing the electron affect sodium's charge?

Correct AnswerverifiedShow Answer

The measure of an atom's ability to pull electrons away from another atom is called ____.

Correct AnswerverifiedShow Answer

For an atom to be electrically neutral, it must have the same number of ____.

Correct AnswerverifiedShow Answer

Which type of chemical bond joins the oxygen (atomic number 8) and carbon (atomic number 6) atoms in carbon dioxide (CO2) ?

Correct AnswerverifiedShow Answer

Match the following terms with the best description. -a type of molecule that has atoms of two or more elements

Correct AnswerverifiedShow Answer

Explain why atoms such as helium (atomic number 2), neon (atomic number 10), and argon (atomic number 18) do not react with other atoms.

Correct AnswerverifiedIn these atoms, the outermost ...View AnswerShow Answer

Match the terms with their most suitable description. -atomic number

Correct AnswerverifiedShow Answer

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Carbon has several isotopes including ¹²C and ¹⁴C. These isotopes differ in the number of ____.

Correct Answer
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What is the pH of a solution in which the number of H⁺ ions equals the number of OH^- ions?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which type of chemical bond joins the oxygen (atomic number 8) and carbon (atomic number 6) atoms in carbon dioxide (CO₂) ?

Correct Answer
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Correct Answer
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Correct Answer
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In these atoms, the outermost ...
View Answer

Correct Answer
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