Question 1

Oxygen ordinarily has 8 protons and 8 neutrons.Another rare form has two extra neutrons.These two forms are

Accepted Answer

A)  oxygen ions.
B)  oxygen isotopes.
C)  oxygen compounds.
D)  oxygen shells.
E)  oxygen orbitals.F) D) and E)
G) B) and D)

Question 2

Water is most dense and thus heavier at 4 degrees Centigrade.At zero degrees Centigrade ice forms and can float on liquid water.Suppose ice were most dense at zero degrees Centigrade.Select the best explanation of what would happen in aquatic systems.

Accepted Answer

A)  The ice would cover the surface of the aquatic system and would never melt.
B)  The ice would cover the bottom of the aquatic system and would build up in layers over time,especially in colder climates.
C)  The ice would eventually form into large sheets and would travel as a glacier carving out more depressions for lakes to form.
D)  The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules,thus causing the existing ice crystals to become disassociated from each other.E) B) and C)
F) C) and D)

Question 3

In the crystal matrix of ordinary salt,the sodium and chlorine are held together by

Accepted Answer

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

Question 4

Smallest particle in the atom.

Accepted Answer

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

Question 5

Capillary action is one of the forces that aids water's upward movement in plants.The more narrow the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules

Accepted Answer

A)  storing heat and thus moving faster because of heat of vaporization.
B)  producing sufficient surface tension to overcome the pull of gravity.
C)  having a strong cohesive force and attaching to the surrounding vessel walls.
D)  having an adhesive force,which allows them to attach to the vessel walls.
E)  being associated with hydrophobic molecules,which can result in upward movement.F) A) and E)
G) C) and E)

Question 6

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) None of the above
G) A) and E)

Question 7

On the first day of organic chemistry class the person sitting next to you exclaims that he is excited about the class because he is very interested in organic farming practices.You tell him that in the context of this class,organic refers to

Accepted Answer

A)  agricultural farming practices.
B)  trace elements such as zinc and iodine.
C)  the 92 naturally occurring elements on Earth.
D)  carbon-containing compounds.E) None of the above
F) All of the above

Question 8

Consider the following electronegativity values:
Boron (B) = 1.8
Carbon (C) = 2.5
Chlorine (Cl) = 3.2
Selenium (Se) = 2.6
Which of the following bonds is the most polar?

Accepted Answer

A)  B―Cl
B)  C―Cl
C)  Se―Cl
D)  cannot determine from the information providedE) A) and D)
F) A) and C)

Question 9

Compared with a pH of 7,a solution of pH 5 has

Accepted Answer

A)  1/100 of the hydrogen concentration.
B)  5/7 of the hydrogen concentration.
C)  very nearly the same concentration.
D)  2 times the hydrogen concentration.
E)  100 times the hydrogen concentration.F) C) and D)
G) A) and C)

Question 10

The half-life of Carbon-14 is approximately 5,600 years.Using this information scientists have been able to determine the age of some artifacts left by humans.Suppose that a scientist wanted to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered.She removed the wood (with permission) to her laboratory.Her wood sample contained 2 grams of Carbon-14.If the age of the wood was determined to be 22,400 years old,how much Carbon-14 originally existed in this piece of wood?

Accepted Answer

A)  32 grams
B)  16 grams
C)  12 grams
D)  8 grams
E)  4 gramsF) A) and B)
G) A) and E)

Question 11

Water is extremely important in living things for all of the following reasons except

Accepted Answer

A)  it adheres to substances (wets them) because it is polar.
B)  it is an excellent buffer.
C)  it has high specific heat and resists temperature change.
D)  it is a good solvent;most things dissolve in it.
E)  it has high heat of vaporization and low density of icE.F) A) and E)
G) All of the above

Question 12

Based on information provided,which of the following best describes sulfer-35?

Accepted Answer

A)  an atom
B)  an isotope
C)  an element
D)  an anionE) A) and C)
F) B) and C)

Question 13

Atoms are composed of electrons and a dense nucleus which contains protons and _____________.

Accepted Answer

A)  oxygen
B)  water
C)  hydrogen
D)  neutronsE) B) and C)
F) A) and B)

Question 14

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s22s22p6.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

Accepted Answer

A)  1s22s23p64s25p6
B)  1s22s62p23s63p2
C)  1s22s22p63s23p6
D)  1s22s83p8E) A) and B)
F) A) and C)

Question 15

Which of the following is not one of the four most abundant (more than 99%) atoms found in living things?

Accepted Answer

A)  carbon
B)  hydrogen
C)  nitrogen
D)  oxygen
E)  phosphorusF) A) and B)
G) A) and C)

Question 16

After years of hard work in the laboratory,you have identified an enzyme involved in a cellular reaction.How does the enzyme affect both 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) C) and D)
F) A) and C)

Question 17

Your friend is having a little difficulty understanding the nature of covalent bonding,especially single bonds,double bonds,and triple bonds.He thinks that you can explain the difference.What answer would be correct?

Accepted Answer

A)  Covalent bonds are bonds between atoms in which the atoms share electrons.For example,a single bond involves one electron,a double bond involves two electrons,and a triple bond involves three electrons.
B)  Covalent bonds are bonds between atoms in which the atoms shares pairs of electrons.For example,a single bond involves one pair of electrons,a double bond involves two pairs of electrons,and a triple bond involves three pairs of electrons.
C)  Covalent bonds are bonds between atoms in which the atoms receive electrons.For example,a single bond involves removing one electron,a double bond involves removing two electrons,and a triple bond involves removing three electrons.
D)  Covalent bonds are bonds between atoms with polar sides.For example,a single bond involves one electron and one proton,a double bond involves two electrons and two protons,and a triple bond involves three electrons and three protons.E) B) and D)
F) None of the above

Question 18

Which of the following elements' isotopic ratios are used to make absolute determinations of the time of formation of materials?

Accepted Answer

A)  oxygen
B)  hydrogen
C)  carbon
D)  nitrogen
E)  radonF) B) and D)
G) B) and C)

Question 19

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

Accepted Answer

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

Question 20

Negatively charged particles of atoms with almost no mass are called

Accepted Answer

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

Exam 2: The Nature of Molecules

Consider the following electronegativity values: Boron (B) = 1.8 Carbon (C) = 2.5 Chlorine (Cl) = 3.2 Selenium (Se) = 2.6 Which of the following bonds is the most polar?

Correct Answer
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The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s²2s²2p⁶.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

Correct Answer
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Oxygen ordinarily has 8 protons and 8 neutrons.Another rare form has two extra neutrons.These two forms are

Correct Answer
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Which of the following is not one of the four most abundant (more than 99%) atoms found in living things?

Correct Answer
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Negatively charged particles of atoms with almost no mass are called

Correct Answer
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In the crystal matrix of ordinary salt,the sodium and chlorine are held together by

Correct Answer
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Water is extremely important in living things for all of the following reasons except

Correct Answer
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After years of hard work in the laboratory,you have identified an enzyme involved in a cellular reaction.How does the enzyme affect both the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Correct Answer
verified

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

Correct Answer
verified

Capillary action is one of the forces that aids water's upward movement in plants.The more narrow the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules

Correct Answer
verified

Correct Answer
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Water is most dense and thus heavier at 4 degrees Centigrade.At zero degrees Centigrade ice forms and can float on liquid water.Suppose ice were most dense at zero degrees Centigrade.Select the best explanation of what would happen in aquatic systems.

Correct Answer
verified

Your friend is having a little difficulty understanding the nature of covalent bonding,especially single bonds,double bonds,and triple bonds.He thinks that you can explain the difference.What answer would be correct?

Correct Answer
verified

Compared with a pH of 7,a solution of pH 5 has

Correct Answer
verified

Atoms are composed of electrons and a dense nucleus which contains protons and _____________.

Correct Answer
verified

Smallest particle in the atom.

Correct Answer
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The area around a nucleus where an electron is most likely to be found is called

Correct Answer
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Based on information provided,which of the following best describes sulfer-35?

Correct Answer
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Which of the following elements' isotopic ratios are used to make absolute determinations of the time of formation of materials?

Correct Answer
verified

On the first day of organic chemistry class the person sitting next to you exclaims that he is excited about the class because he is very interested in organic farming practices.You tell him that in the context of this class,organic refers to

Correct Answer
verified

Exam 2: The Nature of Molecules

Consider the following electronegativity values: Boron (B) = 1.8 Carbon (C) = 2.5 Chlorine (Cl) = 3.2 Selenium (Se) = 2.6 Which of the following bonds is the most polar?

Correct AnswerverifiedShow Answer

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s22s22p6.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

Correct AnswerverifiedShow Answer

Oxygen ordinarily has 8 protons and 8 neutrons.Another rare form has two extra neutrons.These two forms are

Correct AnswerverifiedShow Answer

Which of the following is not one of the four most abundant (more than 99%) atoms found in living things?

Correct AnswerverifiedShow Answer

Negatively charged particles of atoms with almost no mass are called

Correct AnswerverifiedShow Answer

In the crystal matrix of ordinary salt,the sodium and chlorine are held together by

Correct AnswerverifiedShow Answer

Water is extremely important in living things for all of the following reasons except

Correct AnswerverifiedShow Answer

After years of hard work in the laboratory,you have identified an enzyme involved in a cellular reaction.How does the enzyme affect both the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Capillary action is one of the forces that aids water's upward movement in plants.The more narrow the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Water is most dense and thus heavier at 4 degrees Centigrade.At zero degrees Centigrade ice forms and can float on liquid water.Suppose ice were most dense at zero degrees Centigrade.Select the best explanation of what would happen in aquatic systems.

Correct AnswerverifiedShow Answer

Your friend is having a little difficulty understanding the nature of covalent bonding,especially single bonds,double bonds,and triple bonds.He thinks that you can explain the difference.What answer would be correct?

Correct AnswerverifiedShow Answer

Compared with a pH of 7,a solution of pH 5 has

Correct AnswerverifiedShow Answer

Atoms are composed of electrons and a dense nucleus which contains protons and _____________.

Correct AnswerverifiedShow Answer

Smallest particle in the atom.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Based on information provided,which of the following best describes sulfer-35?

Correct AnswerverifiedShow Answer

Which of the following elements' isotopic ratios are used to make absolute determinations of the time of formation of materials?

Correct AnswerverifiedShow Answer

On the first day of organic chemistry class the person sitting next to you exclaims that he is excited about the class because he is very interested in organic farming practices.You tell him that in the context of this class,organic refers to

Correct AnswerverifiedShow Answer

Correct Answer
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The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s²2s²2p⁶.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

Correct Answer
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