Question 1

The term to describe any substance which can prevent the pH of a solution from changing by either releasing or absorbing H+ in a solution is

Accepted Answer

A)   equalizer.
B)   solute.
C)   buffer.
D)   acid.
E)   base.F) A) and E)
G) C) and D)

Question 2

Which of the following is a property of acids?

Accepted Answer

A)   release hydrogen ions when dissolved in a liquid
B)   feel slippery when touched
C)   taste bitter
D)   release hydroxide ions when dissolved in a liquid
E)   have a pH reading above 7.0F) A) and B)
G) C) and D)

Question 3

In what ways are radioactive isotopes potentially harmful?

Accepted Answer

A)   Unmonitored release into the environment can make changes in a cell's DNA.
B)   They are used to trace molecular changes.
C)   They are used to destroy abnormal cells.
D)   They are used to determine the age of biological specimens.
E)   They are used to trace the path of materials throughout the body.F) B) and D)
G) B) and E)

Question 4

An atom that has an electrical charge is called a(n)

Accepted Answer

A)   ion.
B)   molecule.
C)   isotope.
D)   element.
E)   proton.F) B) and E)
G) A) and C)

Question 5

Which of the following would not be a valuable use for radioactive isotopes?

Accepted Answer

A)   carbon-14 dating
B)   destroying abnormal cells as a type of cancer treatment
C)   tracing the path of various chemicals in the body for imaging
D)   determining the age of biological specimens
E)   damaging DNA of healthy cells.F) A) and E)
G) C) and D)

Question 6

Which of the following is NOT a property of water?

Accepted Answer

A)   It is a good solvent.
B)   It is denser when frozen than when liquid.
C)   It is cohesive.
D)   It resists temperature changes.
E)   It can be found as a solid, liquid, or gas.F) A) and B)
G) C) and D)

Question 7

What is the steam being given off when water boils?

Accepted Answer

A)   oxygen molecules
B)   hydrogen molecules
C)   water molecules
D)   hydroxide (OH-)  ions
E)   hydrogen (H+)  ionF) All of the above
G) A) and E)

Question 8

Which of the following describe how an acid disrupts the chemical bonds of molecules in a cell?

Accepted Answer

A)   the H+ ions can disrupt hydrogen bonds as the slightly negative portion of the molecule is more attracted to it than to the hydrogen that was part of the bond.
B)   the H+ ions can disrupt hydrogen bonds as the slightly positive portion of the molecule is more attracted to it than to the hydrogen that was part of the bond.
C)   the OH- ions can disrupt hydrogen bonds as the slightly positive portion of the molecule is more attracted to it than to the hydrogen that was part of the bond.
D)   the OH- ions can disrupt hydrogen bonds as the slightly negative portion of the molecule is more attracted to it than to the hydrogen that was part of the bond.
E)   The H+ ions disrupt the covalent bonds that hold the molecule together.F) A) and B)
G) A) and C)

Question 9

Which property of water would help to account for how an individual who is exercising and producing excessive heat can maintain a constant body temperature?

Accepted Answer

A)   Water has high heat capacity.
B)   Water is less dense as ice.
C)   Water is a good solvent.
D)   Water is cohesive.
E)   Water molecules form by covalent bonding.F) All of the above
G) None of the above

Question 10

A covalent bond occurs when ________.

Accepted Answer

A)   protons are transferred from one atom to another
B)   neutrons are shared between two atoms to form an isotope
C)   electrons are shared between two atoms to complete their octets
D)   the hydrogen of one water molecule is attracted to the oxygen of another water molecule
E)   electrons are transferred from one atom to anotherF) C) and D)
G) A) and E)

Question 11

The figure below is depicting the interaction of water molecules with one another which involves the use of ________.

Accepted Answer

A)   covalent bonds
B)   hydrogen bonds
C)   ionic bonds
D)   valence shells
E)   solventsF) C) and D)
G) A) and E)

Question 12

Which one of the following is the smallest unit of matter that has all the properties of an element?

Accepted Answer

A)   molecule
B)   element
C)   atom
D)   compound
E)   electronF) B) and E)
G) A) and B)

Question 13

A water molecule, as shown here, is polar because of ________.

Accepted Answer

A)   transfer of electrons
B)   unequal sharing of electrons
C)   its ability to freeze
D)   its hydrogen bonds
E)   its change in density when frozenF) None of the above
G) A) and B)

Question 14

Inside a living cell, which type of bond would be the most stable?

Accepted Answer

A)   hydrogen
B)   ionic
C)   covalent
D)   polar
E)   all bonds are equally stable in a living systemF) C) and E)
G) All of the above

Question 15

Which of the following is not a way in which chemical bonds can be formed?

Accepted Answer

A)   sharing electrons
B)   losing electrons
C)   splitting electrons
D)   gaining electrons
E)   attractions of opposite chargeF) C) and D)
G) C) and E)

Question 16

How do a strong acid and a weak acid differ?

Accepted Answer

A)   A strong acid has less H+ in solution.
B)   A weak acid dissociates only partially in water.
C)   A strong acid is less likely to remain dissociated.
D)   A weak acid dissociates nearly completely in water.
E)   A strong acid dissociates only partly in water.F) B) and E)
G) A) and E)

Question 17

A covalent bond involves the sharing of

Accepted Answer

A)   electrons.
B)   protons.
C)   pairs of protons.
D)   at least 3 electrons.
E)   pairs of electrons.F) B) and C)
G) A) and D)

Question 18

Sulfur has an atomic number of 16. What would be the valence number of this element?

Accepted Answer

A)   One
B)   Two
C)   Three
D)   Four
E)   SixF) B) and E)
G) A) and E)

Question 19

An ionic bond forms when

Accepted Answer

A)   an atom gives away or takes in an electron.
B)   an atom gives away or takes in a proton.
C)   a negatively charged ion is attracted to one with a positive charge.
D)   two atoms come close enough to share one or more electrons.
E)   two atoms come close enough to share one or more protons.F) A) and B)
G) A) and C)

Question 20

The type of bond that would form from the transfer of an electron from one atom to another, as depicted in the figure, is a

Accepted Answer

A)   covalent.
B)   ionic.
C)   hydrogen.
D)   atomic.
E)   isotope.F) A) and B)
G) C) and D)

Exam 2: The Chemical Basis of Life

The figure below is depicting the interaction of water molecules with one another which involves the use of ________.

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Which of the following is not a way in which chemical bonds can be formed?

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In what ways are radioactive isotopes potentially harmful?

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A covalent bond involves the sharing of

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An ionic bond forms when

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What is the steam being given off when water boils?

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Inside a living cell, which type of bond would be the most stable?

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Which one of the following is the smallest unit of matter that has all the properties of an element?

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The type of bond that would form from the transfer of an electron from one atom to another, as depicted in the figure, is a

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Which of the following would not be a valuable use for radioactive isotopes?

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Which property of water would help to account for how an individual who is exercising and producing excessive heat can maintain a constant body temperature?

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An atom that has an electrical charge is called a(n)

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Which of the following is NOT a property of water?

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A covalent bond occurs when ________.

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How do a strong acid and a weak acid differ?

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A water molecule, as shown here, is polar because of ________.

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Sulfur has an atomic number of 16. What would be the valence number of this element?

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The term to describe any substance which can prevent the pH of a solution from changing by either releasing or absorbing H+ in a solution is

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Which of the following describe how an acid disrupts the chemical bonds of molecules in a cell?

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Which of the following is a property of acids?

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The term to describe any substance which can prevent the pH of a solution from changing by either releasing or absorbing H⁺ in a solution is

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