Question 1

If orange juice has a pH of 4 then it can be described as

Accepted Answer

A)  having a H+ concentration is 4.
B)  an acidic solution.
C)  an alkaline solution.
D)  an acidic solution with a H+ concentration of 4.
E)  None of these choices are correct.F) All of the above
G) A) and D)

Question 2

Water

Accepted Answer

A)  is nonpolar.
B)  has a low heat of vaporization.
C)  has cohesive properties.
D)  evaporates and increases body temperature.
E)  is a relatively poor solvent.F) C) and D)
G) D) and E)

Question 3

Zn + 2H+ = Zn2+ + H2 is an example of a redox reaction.What is happening during this interaction? Is a bond created between the atoms during this reaction?

Accepted Answer

A)  Oxidation reaction and acceptance of an electron;bond is formed.
B)  Reduction reaction and acceptance of an electron;no bond is formed.
C)  Reduction reaction and donation of an electron;no bond is formed.
D)  Covalent interaction;bond is formeD.E) A) and D)
F) All of the above

Question 4

You've been asked to stabilize a compound whose general state is altered by excess electrons.The element you would add to the compound to most effectively stabilize the compound would be? Why?

Accepted Answer

A)  Carbon,because it is capable of neutralizing electrons.
B)  Nitrogen,because it has five electrons on its outer shell.
C)  Fluorine,because it is the greediest atom on the periodic table.
D)  Oxygen,because it can easily bind with the compounD.E) None of the above
F) All of the above C

Question 5

Sulfur 35 (35S)is an isotope of 32S.These elements differ in their number of neutrons.

Accepted Answer

A) True 
 B)False  True

Question 6

The first,inner-most energy shell of an atom

Accepted Answer

A)  can have a maximum of 8 electrons.
B)  can have a maximum of 2 electrons.
C)  is called the 2p orbital.
D)  is called the 1s orbital and can have a maximum of 8 electrons.
E)  is called the 2p orbital and can have a maximum of 2 electrons.F) A) and B)
G) D) and E)

Question 7

The single atom you would choose to remove from living organisms in order to remove the highest percentage of atoms would be

Accepted Answer

A)  oxygen.
B)  nitrogen.
C)  hydrogen.
D)  carbon.E) None of the above
F) All of the above

Question 8

Most enzymes or bioactive molecules work effectively within a broad range of pH.

Accepted Answer

A) True 
 B)False  False

Question 9

Water has fewer hydrogen atoms than lemon juice and a pH of around 7.Predict what will happen to the pH level of water when lemon juice is added.

Accepted Answer

A)  The pH will become higher.
B)  The pH will become lower.
C)  The pH will remain the same.
D)  There is not enough information to decide.E) All of the above
F) B) and C)

Question 10

The electronegativity of an atom is a measure of its ability to attract electrons to its outer shell from another atom.

Accepted Answer

A) True 
 B)False

Question 11

If 1000 millimoles make up a mole,how many grams of magnesium (Mg) ,which has an atomic mass of 24.305,will make a solution of 150 µmol?

Accepted Answer

A)  3.6mg
B)  2.4mg
C)  0.24mg
D)  36mgE) B) and C)
F) C) and D)

Question 12

1 mole = 1000 millimoles (mmol) ;1millimole = 1000 micromoles (µmol) .If a solution contains 38231 µmol,what is that amount in mmol?

Accepted Answer

A)  382.31 mmol
B)  38.231 mmol
C)  3.8231 mmol
D)  3823.1 mmolE) All of the above
F) None of the above

Question 13

You have been asked to synthesize a new isotope for cadmium.Which part of the original atom would you need to manipulate in order to create an isotope?

Accepted Answer

A)  Neutrons
B)  Protons
C)  Protons and neutrons
D)  ElectronsE) B) and C)
F) B) and D)

Question 14

The addition of a strong acid like HCl to an aqueous solution would result in

Accepted Answer

A)  the release of H+ into the solution.
B)  an increase in pH.
C)  a decrease in pH.
D)  both the release of H+ and an increase in pH.
E)  both the release of H+ and a decrease in pH.F) A) and D)
G) A) and C)

Question 15

What is most accurate when comparing solutions with a pH of 6 and a pH of 8?

Accepted Answer

A)  The solution with a pH of 8 has a 100 times higher concentration of hydrogen ions than a solution with a pH of 6.
B)  Solutions with a pH of 8 has a 2 times lower concentration of hydrogen ions than a solution with a pH of 6.
C)  The solution with a pH of 6 has a 100 times higher concentration of hydrogen ions than a solution with a pH of 8.
D)  The solution with a pH of 6 has a 100 times lower concentration of hydrogen ions than a solution with a pH of 8.
E)  The solution with a pH of 6 has a 2 times higher concentration of hydrogen ions than a solution with a pH of 8.F) A) and C)
G) C) and D)

Question 16

Amphipathic molecules

Accepted Answer

A)  possess only hydrophilic properties.
B)  possess only hydrophobic properties.
C)  possess both hydrophilic and hydrophobic properties.
D)  possess neither hydrophilic nor hydrophobic properties.
E)  tend not to interact with other molecules.F) None of the above
G) B) and C)

Question 17

Table salt forms from sodium and chloride via hydrogen bonding.

Accepted Answer

A) True 
 B)False

Question 18

Molecules

Accepted Answer

A)  are derived from the ionic bonding of two or more atoms.
B)  have the same physical properties as the atoms from which they were derived.
C)  are not important in biological processes.
D)  can form from the covalent bonding of two or more atoms.
E)  cannot have a chargE.F) A) and B)
G) C) and D)

Question 19

Isotopes are different forms of the same element.

Accepted Answer

A) True 
 B)False

Question 20

What would be the most likely outcome if water molecules had a straight geometry instead of a bent geometry?

Accepted Answer

A)  Hydrogen bonding between water molecules would have potentially shorter bond distance.
B)  The partially positive ends would be at the poles of the molecule and the partially negative would be in the middle.
C)  Water would tend to stack more closely and water would become more dense.
D)  Water would take up more physical space.
E)  Basic principles of chemistry and bonding would be violated.F) A) and E)
G) C) and D)

Exam 2: The Chemical Basis of Life I: Atoms, Molecules, and Water

If orange juice has a pH of 4 then it can be described as

Correct AnswerverifiedShow Answer

Water

Correct AnswerverifiedShow Answer

Zn + 2H+ = Zn2+ + H2 is an example of a redox reaction.What is happening during this interaction? Is a bond created between the atoms during this reaction?

Correct AnswerverifiedShow Answer

You've been asked to stabilize a compound whose general state is altered by excess electrons.The element you would add to the compound to most effectively stabilize the compound would be? Why?

Correct AnswerverifiedC

Sulfur 35 (35S)is an isotope of 32S.These elements differ in their number of neutrons.

Correct AnswerverifiedTrue

The first,inner-most energy shell of an atom

Correct AnswerverifiedShow Answer

The single atom you would choose to remove from living organisms in order to remove the highest percentage of atoms would be

Correct AnswerverifiedShow Answer

Most enzymes or bioactive molecules work effectively within a broad range of pH.

Correct AnswerverifiedFalse

Water has fewer hydrogen atoms than lemon juice and a pH of around 7.Predict what will happen to the pH level of water when lemon juice is added.

Correct AnswerverifiedShow Answer

The electronegativity of an atom is a measure of its ability to attract electrons to its outer shell from another atom.

Correct AnswerverifiedShow Answer

If 1000 millimoles make up a mole,how many grams of magnesium (Mg) ,which has an atomic mass of 24.305,will make a solution of 150 µmol?

Correct AnswerverifiedShow Answer

1 mole = 1000 millimoles (mmol) ;1millimole = 1000 micromoles (µmol) .If a solution contains 38231 µmol,what is that amount in mmol?

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You have been asked to synthesize a new isotope for cadmium.Which part of the original atom would you need to manipulate in order to create an isotope?

Correct AnswerverifiedShow Answer

The addition of a strong acid like HCl to an aqueous solution would result in

Correct AnswerverifiedShow Answer

What is most accurate when comparing solutions with a pH of 6 and a pH of 8?

Correct AnswerverifiedShow Answer

Amphipathic molecules

Correct AnswerverifiedShow Answer

Table salt forms from sodium and chloride via hydrogen bonding.

Correct AnswerverifiedShow Answer

Molecules

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Isotopes are different forms of the same element.

Correct AnswerverifiedShow Answer

What would be the most likely outcome if water molecules had a straight geometry instead of a bent geometry?

Correct AnswerverifiedShow Answer

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Zn + 2H⁺ = Zn2⁺ + H₂ is an example of a redox reaction.What is happening during this interaction? Is a bond created between the atoms during this reaction?

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C

Sulfur 35 (³⁵S)is an isotope of ³²S.These elements differ in their number of neutrons.

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True

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False

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