Question 1

Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Accepted Answer

A)  Both magnesium and chlorine are reduced.
B)  Both magnesium and chlorine are oxidized.
C)  Chlorine is oxidized and magnesium is reduced.
D)  Magnesium is oxidized and chlorine is reduced.E) A) and B)
F) A) and C)

Question 2

The atomic number of an element is equal to the number of:

Accepted Answer

A)  protons only.
B)  neutrons only.
C)  protons plus electrons.
D)  protons plus neutrons.
E)  neutrons plus electrons.F) C) and D)
G) A) and C)

Question 3

As you and a friend are entering a chemistry laboratory at your university,you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

Accepted Answer

A)  Radioactive isotopes are atoms that are unstable and as a result emit energy in a process called radioactive decay.
B)  Radioactive isotopes are atoms that are stable and as a result emit energy in a process called radioactive decay.
C)  Radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures.
D)  Radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical process will remain intact and pose no problems.E) A) and B)
F) B) and C)

Question 4

The smallest subatomic particle is the ________.

Accepted Answer

A)  electron
B)  ion
C)  isotope
D)  neutron
E)  protonF) D) and E)
G) A) and B)

Question 5

In the Hershey-Chase experiment,bacterial viruses,called phage,were used to demonstrate that DNA is the genetic material.The phage that were used for this experiment consisted of DNA surrounded by a protein coat.Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell.To scientifically determine whether DNA is the genetic material,Hershey and Chase made phage in a medium containing radioactive sulfur-35 (S35) .Why was S35 used in this experiment?

Accepted Answer

A)  Only amino acids contain sulfur.
B)  Only nucleic acids contain sulfur.
C)  Both nucleic acids and amino acids contain sulfur.
D)  The radioactive sulfur labels peptide bonds.E) C) and D)
F) B) and D)

Question 6

Nitrogen has a higher electronegativity than hydrogen.As a result you would expect that ammonia (NH3) molecules can form ________ with each other.

Accepted Answer

A)  hydrogen bonds
B)  hydrophilic bonds
C)  ionic bonds
D)  covalent bonds
E)  cohesive bondsF) B) and D)
G) All of the above

Question 7

Atoms of a single element that possess different numbers of neutrons are called:

Accepted Answer

A)  polymers.
B)  ions.
C)  monomers.
D)  isomers.
E)  isotopes.F) A) and D)
G) C) and D)

Question 8

Atomic nuclei contain protons and ________.

Accepted Answer

A)  isomers
B)  ions
C)  moles
D)  neutronsE) C) and D)
F) A) and C)

Question 9

All atoms possess the ability to do work.The term that is defined as the ability to do work is:

Accepted Answer

A)  matter
B)  energy
C)  molecules
D)  spaceE) B) and C)
F) A) and B)

Question 10

Negatively charged subatomic particles that have almost no mass are called:

Accepted Answer

A)  electrons.
B)  protons.
C)  neutrons.
D)  ions.
E)  polymers.F) A) and D)
G) A) and C)

Question 11

A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions.What is the best approximation of the new pH value?

Accepted Answer

A)  0
B)  5
C)  7
D)  9
E)  14F) B) and E)
G) A) and C)

Question 12

Why is it necessary to take special safety precautions when using radioactivity?

Accepted Answer

A)  Radioactive substances will ionize cells.
B)  Radioactive substances have the potential to cause damage to living cells.
C)  Radioactive substances decay.
D)  Radioactive substances will perforate plasma membranes.E) C) and D)
F) B) and D)

Question 13

The area around a nucleus where an electron is most likely to be found is the:

Accepted Answer

A)  electrical space.
B)  energy level.
C)  polar space.
D)  orbital.E) B) and C)
F) A) and C)

Question 14

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ________.

Accepted Answer

A)  Hydrogen bonds
B)  Ionic bonds
C)  Covalent bonds
D)  Hydrophobic interactionsE) A) and D)
F) C) and D)

Question 15

You identify an enzyme involved in a cellular reaction.How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Accepted Answer

A)  It alters the reaction equilibrium and shortens the time needed to reach equilibrium.
B)  The reaction equilibrium is unaffected,but it shortens the time needed to reach equilibrium.
C)  It alters the reaction equilibrium and lengthens the time needed to reach equilibrium.
D)  The reaction equilibrium is unaffected,but it lengthens the time needed to reach equilibrium.E) None of the above
F) B) and C)

Question 16

Sugars dissolve well in water because of water's ________.

Accepted Answer

A)  ionic bonds
B)  cohesiveness
C)  hydrophobic exclusion
D)  polarityE) A) and D)
F) A) and B)

Question 17

Organisms are composed of molecules,which are collections of smaller units,termed:

Accepted Answer

A)  monomers.
B)  atoms.
C)  electrons.
D)  polymers.
E)  ions.F) All of the above
G) C) and E)

Question 18

Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain ________.

Accepted Answer

A)  one single covalent bond
B)  four hydrogen bonds
C)  two double covalent bonds
D)  two single covalent bondsE) B) and D)
F) B) and C)

Question 19

When two atoms share a pair of electrons,the bonding is referred to as:

Accepted Answer

A)  ionic.
B)  covalent.
C)  unstable.
D)  hydrogen.E) All of the above
F) B) and D)

Question 20

The electronegativity of nitrogen (N) is 3.0,while the electronegativity of hydrogen (H) is 2.1.Knowing this,consider how the electrons will be shared in ammonia (NH3) .What do you predict about the polarity of ammonia?

Accepted Answer

A)  Each H atom has a partial positive charge
B)  The N atom has a partial positive charge
C)  Each H atom has a partial negative charge
D)  The N atom has a strong positive chargeE) A) and B)
F) B) and C)

Exam 2: The Nature of Molecules and the Properties of Water

The atomic number of an element is equal to the number of:

Correct Answer
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A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions.What is the best approximation of the new pH value?

Correct Answer
verified

Why is it necessary to take special safety precautions when using radioactivity?

Correct Answer
verified

As you and a friend are entering a chemistry laboratory at your university,you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

Correct Answer
verified

All atoms possess the ability to do work.The term that is defined as the ability to do work is:

Correct Answer
verified

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ________.

Correct Answer
verified

Sugars dissolve well in water because of water's ________.

Correct Answer
verified

Negatively charged subatomic particles that have almost no mass are called:

Correct Answer
verified

Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain ________.

Correct Answer
verified

When two atoms share a pair of electrons,the bonding is referred to as:

Correct Answer
verified

You identify an enzyme involved in a cellular reaction.How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Correct Answer
verified

Nitrogen has a higher electronegativity than hydrogen.As a result you would expect that ammonia (NH₃) molecules can form ________ with each other.

Correct Answer
verified

Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Correct Answer
verified

Atoms of a single element that possess different numbers of neutrons are called:

Correct Answer
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Correct Answer
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Atomic nuclei contain protons and ________.

Correct Answer
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The electronegativity of nitrogen (N) is 3.0,while the electronegativity of hydrogen (H) is 2.1.Knowing this,consider how the electrons will be shared in ammonia (NH₃) .What do you predict about the polarity of ammonia?

Correct Answer
verified

Organisms are composed of molecules,which are collections of smaller units,termed:

Correct Answer
verified

The area around a nucleus where an electron is most likely to be found is the:

Correct Answer
verified

The smallest subatomic particle is the ________.

Correct Answer
verified

Exam 2: The Nature of Molecules and the Properties of Water

The atomic number of an element is equal to the number of:

Correct AnswerverifiedShow Answer

A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions.What is the best approximation of the new pH value?

Correct AnswerverifiedShow Answer

Why is it necessary to take special safety precautions when using radioactivity?

Correct AnswerverifiedShow Answer

As you and a friend are entering a chemistry laboratory at your university,you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

Correct AnswerverifiedShow Answer

All atoms possess the ability to do work.The term that is defined as the ability to do work is:

Correct AnswerverifiedShow Answer

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ________.

Correct AnswerverifiedShow Answer

Sugars dissolve well in water because of water's ________.

Correct AnswerverifiedShow Answer

Negatively charged subatomic particles that have almost no mass are called:

Correct AnswerverifiedShow Answer

Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain ________.

Correct AnswerverifiedShow Answer

When two atoms share a pair of electrons,the bonding is referred to as:

Correct AnswerverifiedShow Answer

You identify an enzyme involved in a cellular reaction.How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Correct AnswerverifiedShow Answer

Nitrogen has a higher electronegativity than hydrogen.As a result you would expect that ammonia (NH3) molecules can form ________ with each other.

Correct AnswerverifiedShow Answer

Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Correct AnswerverifiedShow Answer

Atoms of a single element that possess different numbers of neutrons are called:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Atomic nuclei contain protons and ________.

Correct AnswerverifiedShow Answer

The electronegativity of nitrogen (N) is 3.0,while the electronegativity of hydrogen (H) is 2.1.Knowing this,consider how the electrons will be shared in ammonia (NH3) .What do you predict about the polarity of ammonia?

Correct AnswerverifiedShow Answer

Organisms are composed of molecules,which are collections of smaller units,termed:

Correct AnswerverifiedShow Answer

The area around a nucleus where an electron is most likely to be found is the:

Correct AnswerverifiedShow Answer

The smallest subatomic particle is the ________.

Correct AnswerverifiedShow Answer

Correct Answer
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Nitrogen has a higher electronegativity than hydrogen.As a result you would expect that ammonia (NH₃) molecules can form ________ with each other.

Correct Answer
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The electronegativity of nitrogen (N) is 3.0,while the electronegativity of hydrogen (H) is 2.1.Knowing this,consider how the electrons will be shared in ammonia (NH₃) .What do you predict about the polarity of ammonia?

Correct Answer
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