Question 1

The pH of pure water is ________ because ________.

Accepted Answer

A)   7.0; water dissociates an equal number of H+ ions and OH- ions
B)   14.0; water dissociates and more OH- ions are formed because there are more hydrogen atoms in water
C)   1.0; water dissociates and more H+ ions are formed since hydrogen is smaller and can separate from the oxygen easily
D)   7.0; there are no ions formed in pure water
E)   acidic; there are more H+ ions than OH- ions presentF) A) and B)
G) A) and C)

Question 2

After drinking a great deal of coffee pH 5) , a human's blood buffering system would need to ________ as the coffee was digested to lower the level of acid present in the blood stream.

Accepted Answer

A)   release OH-
B)   take up H+
C)   release H+
D)   take up OH-
E)   release OH- and take up H+F) D) and E)
G) All of the above

Question 3

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 another.F) All of the above
G) A) and B)

Question 4

The number of neutrons present in the nucleus of an average atom of any given element is best estimated by

Accepted Answer

A)   adding the number of electrons and protons together.
B)   subtracting the number of electrons from the number of protons.
C)   adding the mass number to the number of electrons.
D)   subtracting the number of protons from the mass number.
E)   adding the atomic number and atomic mass together.F) B) and D)
G) None of the above

Question 5

Which of the following is not one of the most common elements in living things?

Accepted Answer

A)   oxygen
B)   carbon
C)   calcium
D)   iron
E)   nitrogenF) B) and D)
G) A) and B)

Question 6

Which of the following is not a compound?

Accepted Answer

A)   H2O
B)   O- 2-
C)   NaCl
D)   CO2
E)   MgCl2F) None of the above
G) A) and B)

Question 7

An atom's valence electron shell

Accepted Answer

A)   is filled when it has three electrons.
B)   determines its chemical reactivity.
C)   determines its atomic mass.
D)   is filled with positively charged particles.
E)   is filled identically for every element.F) A) and E)
G) A) and D)

Question 8

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

Accepted Answer

A)   the transfer of electrons.
B)   unequal sharing of electrons.
C)   its ability to freeze.
D)   its hydrogen bonds.
E)   the negative charge of the molecule.F) B) and C)
G) D) and E)

Question 9

An atom with a neutral charge has

Accepted Answer

A)   equal numbers of neutrons and electrons.
B)   more neutrons making it more neutral.
C)   the same number of protons and neutrons.
D)   equal numbers of protons and electrons.
E)   more protons than it does electrons.F) B) and D)
G) A) and E)

Question 10

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)   attracting opposite chargesF) D) and E)
G) A) and E)

Question 11

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 than ice.
C)   Water is a good solvent.
D)   Water is cohesive.
E)   Water molecules form by covalent bonding.F) A) and B)
G) A) and C)

Question 12

Elements differ from each other in their

Accepted Answer

A)   physical properties only.
B)   atomic number only.
C)   type of subatomic particles.
D)   physical properties and atomic number.
E)   type of electrons.F) A) and B)
G) A) and C)

Question 13

Radioactive isotopes are useful in biological studies because

Accepted Answer

A)   an organism will take in a molecule with the isotope and use it normally, but the radioactive decay can be detected.
B)   an organism will take in a molecule with the isotope but will only use it in a few specific reactions, not the normal ones.
C)   an organism will take in the molecule with the isotope and then remove the isotope by sending it through the excretory system, while replacing the isotope with a normal atom.
D)   they are easily visible and normal atoms are not.
E)   they are easy and inexpensive to use in studies.F) All of the above
G) C) and D)

Question 14

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) C) and E)
G) A) and B)

Question 15

Cola has a pH of 3.5. This means that it has an excess of _______ ions and would be called an)  ________.

Accepted Answer

A)   H+; acid
B)   OH-; acid
C)   H+; base
D)   OH-; base
E)   H+; neutral solutionF) All of the above
G) A) and E)

Exam 2: The Chemical Basis of Life

Which of the following is a property of acids?

Correct Answer
verified

The pH of pure water is because .

Correct Answer
verified

After drinking a great deal of coffee pH 5) , a human's blood buffering system would need to ________ as the coffee was digested to lower the level of acid present in the blood stream.

Correct Answer
verified

A covalent bond occurs when

Correct Answer
verified

The number of neutrons present in the nucleus of an average atom of any given element is best estimated by

Correct Answer
verified

Elements differ from each other in their

Correct Answer
verified

Which of the following is not a compound?

Correct Answer
verified

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?

Correct Answer
verified

Radioactive isotopes are useful in biological studies because

Correct Answer
verified

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

Correct Answer
verified

Cola has a pH of 3.5. This means that it has an excess of _ ions and would be called an) __.

Correct Answer
verified

An atom with a neutral charge has

Correct Answer
verified

Which of the following is not one of the most common elements in living things?

Correct Answer
verified

An atom's valence electron shell

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

Correct Answer
verified

Exam 2: The Chemical Basis of Life

Which of the following is a property of acids?

Correct AnswerverifiedShow Answer

The pH of pure water is ________ because ________.

Correct AnswerverifiedShow Answer

After drinking a great deal of coffee pH 5) , a human's blood buffering system would need to ________ as the coffee was digested to lower the level of acid present in the blood stream.

Correct AnswerverifiedShow Answer

A covalent bond occurs when

Correct AnswerverifiedShow Answer

The number of neutrons present in the nucleus of an average atom of any given element is best estimated by

Correct AnswerverifiedShow Answer

Elements differ from each other in their

Correct AnswerverifiedShow Answer

Which of the following is not a compound?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Radioactive isotopes are useful in biological studies because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Cola has a pH of 3.5. This means that it has an excess of _______ ions and would be called an) ________.

Correct AnswerverifiedShow Answer

An atom with a neutral charge has

Correct AnswerverifiedShow Answer

Which of the following is not one of the most common elements in living things?

Correct AnswerverifiedShow Answer

An atom's valence electron shell

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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The pH of pure water is because .

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Cola has a pH of 3.5. This means that it has an excess of _ ions and would be called an) __.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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