Question 1

pH buffers

Accepted Answer

A)   minimize fluctuations in the pH of solutions.
B)   are usually weak acids and bases.
C)   are common in biological fluids.
D)   limit major shifts in the amount of H+ and OH- in solution.
E)   All of the choices are correct.F) B) and D)
G) A) and B)

Question 2

Which of the following is not true of water?

Accepted Answer

A)   It is polar.
B)   It has a high heat of vaporization.
C)   It has cohesive properties.
D)   Its evaporation helps regulate body temperature.
E)   It is a relatively poor solvent.F) A) and D)
G) D) and E)

Question 3

Which is true about a pH buffer?

Accepted Answer

A)   It increases the amount of H+ in an acidic solution.
B)   It reduces the amount of H+ in an acidic solution.
C)   It reduces the amount of H+ in an alkaline solution.
D)   It increases the amount of OH- ions in an alkaline solution.
E)   It reduces the amount of OH- in an acidic solution.F) A) and D)
G) B) and E)

Question 4

If carbon has an atomic mass of 12 and an atomic number of 6 then it has

Accepted Answer

A)   6 electrons.
B)   12 electrons.
C)   18 electrons.
D)   as many as 6 but no more than 12.
E)   None of the choices are correct.F) A) and B)
G) A) and C) A

Question 5

Which of the following represents an ion?

Accepted Answer

A)   Ca2+
B)   He
C)   H2
D)   CO2
E)   KClF) D) and E)
G) All of the above

Question 6

If a scientist were to shoot protons through an atom, for instance like Rutherford did with gold foil, he or she would likely find that

Accepted Answer

A)   most of the protons passed straight through the atom.
B)   few of the protons passed straight through the atom.
C)   most of the protons deflected or bounced back from the atom.
D)   most of the protons would be absorbed by the atom.
E)   All of the choices are correct.F) A) and C)
G) B) and D)

Question 7

Which of the following is LEAST hydrophilic?

Accepted Answer

A)   Na+
B)   HCO3-
C)   oil
D)   amphipathic molecules
E)   CO2F) A) and D)
G) C) and D)

Question 8

Considering solutions with the following pH, which is alkaline?

Accepted Answer

A)   8
B)   7
C)   6
D)   5
E)   All are alkaline.F) A) and E)
G) A) and B)

Question 9

Which of the following represents an abundant element found in living organisms?

Accepted Answer

A)   calcium.
B)   iron.
C)   iodine.
D)   hydrogen.
E)   sodium.F) B) and C)
G) A) and C)

Question 10

Buffers minimize fluctuations in the pH of a solution.

Accepted Answer

A) True 
 B)False

Question 11

If one were to add a strong acid like HCl to an aqueous solution, which would result?

Accepted Answer

A)   H+ would be released into solution.
B)   The pH would increase.
C)   The pH would decrease.
D)   Both H+ would be released into solution and the pH would increase.
E)   Both H+ would be released into solution and the pH would decrease.F) A) and E)
G) B) and E)

Question 12

These are the smallest functional units of matter that form all chemical substances and that cannot be further broken down by ordinary chemical or physical means.

Accepted Answer

A)   protons
B)   neutrons
C)   electrons
D)   atoms
E)   moleculesF) A) and D)
G) A) and C) D

Question 13

This is formed when an atom loses an electron to another atom.

Accepted Answer

A)   polar covalent bond
B)   cations and anions that can form ionic bonds
C)   covalent bond
D)   hydrogen bond
E)   nonpolar covalent bondF) C) and D)
G) A) and B) B

Question 14

Which of the following represents the smallest functional unit of living organisms?

Accepted Answer

A)   atoms
B)   molecules
C)   proteins
D)   water
E)   saltF) None of the above
G) All of the above

Question 15

Isotopes are different forms of the same element that

Accepted Answer

A)   differ in their number of neutrons.
B)   have the same numbers of protons.
C)   are often used in medicine to track biological processes.
D)   can be found in nature.
E)   All the choices are correct.F) C) and D)
G) A) and B)

Question 16

Which of the following is TRUE of a chemical reaction?

Accepted Answer

A)   It requires no energy.
B)   It rarely occurs with a catalyst present.
C)   It changes a substance from one form to another.
D)   It is limited to only a few types of organisms.
E)   They are usually irreversible.F) None of the above
G) A) and E)

Question 17

Oxygen has an atomic mass of 16 and an atomic number of 8.

Accepted Answer

A)   Oxygen has 16 neutrons.
B)   Oxygen has 8 electrons.
C)   Oxygen can form two bonds with other atoms.
D)   Oxygen has 16 neutrons and 8 electrons.
E)   Oxygen has 8 electrons and can form two bonds with other atoms.F) B) and D)
G) A) and E)

Question 18

The presence of salt helps prevent oceans from freezing.

Accepted Answer

A) True 
 B)False

Question 19

Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was important to the development of

Accepted Answer

A)   detection methods for protons.
B)   alpha particle emitters.
C)   gold as an element.
D)   the modern model for atomic structure.
E)   the concept that atoms have a homogenous distribution of protons throughout the atom.F) A) and B)
G) A) and C)

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

pH buffers

Correct Answer
verified

Which of the following is not true of water?

Correct Answer
verified

Which is true about a pH buffer?

Correct Answer
verified

If carbon has an atomic mass of 12 and an atomic number of 6 then it has

Correct Answer
verified
A

Which of the following represents an ion?

Correct Answer
verified

If a scientist were to shoot protons through an atom, for instance like Rutherford did with gold foil, he or she would likely find that

Correct Answer
verified

Which of the following is LEAST hydrophilic?

Correct Answer
verified

Considering solutions with the following pH, which is alkaline?

Correct Answer
verified

Which of the following represents an abundant element found in living organisms?

Correct Answer
verified

Buffers minimize fluctuations in the pH of a solution.

Correct Answer
verified

If one were to add a strong acid like HCl to an aqueous solution, which would result?

Correct Answer
verified

These are the smallest functional units of matter that form all chemical substances and that cannot be further broken down by ordinary chemical or physical means.

Correct Answer
verified
D

This is formed when an atom loses an electron to another atom.

Correct Answer
verified
B

Which of the following represents the smallest functional unit of living organisms?

Correct Answer
verified

Isotopes are different forms of the same element that

Correct Answer
verified

Which of the following is TRUE of a chemical reaction?

Correct Answer
verified

Oxygen has an atomic mass of 16 and an atomic number of 8.

Correct Answer
verified

The presence of salt helps prevent oceans from freezing.

Correct Answer
verified

Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was important to the development of

Correct Answer
verified

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

pH buffers

Correct AnswerverifiedShow Answer

Which of the following is not true of water?

Correct AnswerverifiedShow Answer

Which is true about a pH buffer?

Correct AnswerverifiedShow Answer

If carbon has an atomic mass of 12 and an atomic number of 6 then it has

Correct AnswerverifiedA

Which of the following represents an ion?

Correct AnswerverifiedShow Answer

If a scientist were to shoot protons through an atom, for instance like Rutherford did with gold foil, he or she would likely find that

Correct AnswerverifiedShow Answer

Which of the following is LEAST hydrophilic?

Correct AnswerverifiedShow Answer

Considering solutions with the following pH, which is alkaline?

Correct AnswerverifiedShow Answer

Which of the following represents an abundant element found in living organisms?

Correct AnswerverifiedShow Answer

Buffers minimize fluctuations in the pH of a solution.

Correct AnswerverifiedShow Answer

If one were to add a strong acid like HCl to an aqueous solution, which would result?

Correct AnswerverifiedShow Answer

These are the smallest functional units of matter that form all chemical substances and that cannot be further broken down by ordinary chemical or physical means.

Correct AnswerverifiedD

This is formed when an atom loses an electron to another atom.

Correct AnswerverifiedB

Which of the following represents the smallest functional unit of living organisms?

Correct AnswerverifiedShow Answer

Isotopes are different forms of the same element that

Correct AnswerverifiedShow Answer

Which of the following is TRUE of a chemical reaction?

Correct AnswerverifiedShow Answer

Oxygen has an atomic mass of 16 and an atomic number of 8.

Correct AnswerverifiedShow Answer

The presence of salt helps prevent oceans from freezing.

Correct AnswerverifiedShow Answer

Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was important to the development of

Correct AnswerverifiedShow Answer

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A

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D

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B

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