Question 1

Most biological molecules are joined by

Accepted Answer

A)   ionic bonds.
B)   peptide bonds.
C)   covalent bonds.
D)   disulfide bonds.
E)   hydrogen bonds.

Question 2

What type of bonding exists between the slight positive charge of a hydrogen atom and the slight negative charge of a nearby oxygen atom?

Accepted Answer

The answer of What type of bonding exists between the...

Question 3

more stable than a hydrogen atom (atomic number 1)?

Accepted Answer

Two electrons completely fill ...

Question 4

How does a base differ from an acid?

Accepted Answer

A base is a solution with a co...

Question 5

Hydrophilic molecules

Accepted Answer

A)   form hydrogen bonds among themselves.
B)   do not readily dissolve in water.
C)   are repelled by water.
D)   readily dissolve in water.
E)   are neutral and nonpolar.

Question 6

In general, a substance that carries an electric charge can dissolve in water. Given this fact, which of the following would most likely NOT dissolve in water?

Accepted Answer

A)   Ionic compounds
B)   NaCl
C)   Nonpolar molecules
D)   Polar covalent molecules

Question 7

The human body must maintain a constant pH. In the blood, bicarbonate serves as a(n)  to help maintain the necessary pH.

Accepted Answer

A)   base
B)   solvent
C)   acid
D)   buffer

Question 8

For an atom to achieve maximum stability and become chemically inert, what must occur?

Accepted Answer

A)   Electron pairs are shared.
B)   Its outermost energy shell must be completely filled with electrons.
C)   Ionization occurs.
D)   The number of electrons must equal the number of protons.

Question 9

Imagine that you have been hired as a chemist and your first task is to examine a newly discovered atom. The paperwork you are given states that its atomic number is 110. What does this mean?

Accepted Answer

A)   The atom contains 110 protons.
B)   The atom contains 55 electrons.
C)   The atom is an isotope.
D)   The atom contains 55 protons and 55 neutrons.

Question 10

Most liquids become less dense upon solidification, but water is different in that it becomes denser when it solidifies.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following is LEAST affected by the presence of water?

Accepted Answer

A)   Nonpolar covalent bond
B)   Polar covalent bond
C)   Ionic bond
D)   Hydrogen bond
E)   Electron- proton interaction

Question 12

If sulfur has an atomic number of 16, how many covalent bonds can it form with other atoms?

Accepted Answer

A)   Two
B)   Four
C)   Eight
D)   Six
E)   Zero

Question 13

The specific heat of water is 10 times greater than that of iron. You place a metal pot full of water on the stove to heat it up. You touch the metal handle of the pot when the water is still only lukewarm. Which of the following best describes what happens?

Accepted Answer

A)   You find that both the water and the handle are the same temperature.
B)   You determine that metal pots full of water produce acids and bases.
C)   You find that the handle is cooler than the water in the pot.
D)   You burn your finger and pull your hand away from the hot metal handle.

Question 14

If a certain atom has a tendency to lose two electrons, that atom can then become a(n)

Accepted Answer

A)   polar molecule.
B)   water molecule.
C)   ion.
D)   isotope.

Question 15

Which statement is an accurate description of water molecules?

Accepted Answer

A)   They are uncharged and nonpolar.
B)   They are charged and nonpolar.
C)   They are slightly charged and polar.
D)   They are ionically bonded.

Question 16

A substance with specific properties that cannot be broken down or converted into another substance is called a(n)

Accepted Answer

A)   compound.
B)   mixture.
C)   element.
D)   ion.
E)   molecule.

Question 17

Radioactive isotopes are biological tools that are often used to

Accepted Answer

A)   detect brain tumors and other important medical technologies.
B)   measure the size of fossils.
C)   build up a store of calcium in a cell.
D)   increase the pH of blood.

Question 18

Phosphorus has an atomic number of 15, so what is the distribution of its electrons?

Accepted Answer

A)   The first energy level has 2, the second has 8, and the third has 5.
B)   The electron arrangement cannot be determined from the atomic number alone.
C)   The first energy level has 2 and the second has 13.
D)   The first energy level has 8 and the second has 7.
E)   The first, second, and third energy levels have 5 electrons each.

Question 19

Which of the following best explains the attraction of water molecules to each other?

Accepted Answer

A)   Nonpolar covalent bond
B)   Polar covalent bond
C)   Ionic bond
D)   Hydrogen bond
E)   Electron- proton interaction

Question 20

Which four elements make up approximately 96% of living matter?

Accepted Answer

A)   Carbon, hydrogen, nitrogen, oxygen
B)   Oxygen, hydrogen, calcium, sodium
C)   Carbon, phosphorus, hydrogen, sulfur
D)   Carbon, sodium, chlorine, magnesium
E)   Carbon, oxygen, calcium, sulfur

Exam 2: Atoms, Molecules, and Life

Most liquids become less dense upon solidification, but water is different in that it becomes denser when it solidifies.

Correct AnswerverifiedShow Answer

Which of the following is LEAST affected by the presence of water?

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Hydrophilic molecules

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How does a base differ from an acid?

Correct AnswerverifiedA base is a solution with a co...View AnswerShow Answer

What type of bonding exists between the slight positive charge of a hydrogen atom and the slight negative charge of a nearby oxygen atom?

Correct AnswerverifiedShow Answer

If sulfur has an atomic number of 16, how many covalent bonds can it form with other atoms?

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Phosphorus has an atomic number of 15, so what is the distribution of its electrons?

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Which four elements make up approximately 96% of living matter?

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Most biological molecules are joined by

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A substance with specific properties that cannot be broken down or converted into another substance is called a(n)

Correct AnswerverifiedShow Answer

The specific heat of water is 10 times greater than that of iron. You place a metal pot full of water on the stove to heat it up. You touch the metal handle of the pot when the water is still only lukewarm. Which of the following best describes what happens?

Correct AnswerverifiedShow Answer

If a certain atom has a tendency to lose two electrons, that atom can then become a(n)

Correct AnswerverifiedShow Answer

more stable than a hydrogen atom (atomic number 1)?

Correct AnswerverifiedTwo electrons completely fill ...View AnswerShow Answer

Which of the following best explains the attraction of water molecules to each other?

Correct AnswerverifiedShow Answer

Imagine that you have been hired as a chemist and your first task is to examine a newly discovered atom. The paperwork you are given states that its atomic number is 110. What does this mean?

Correct AnswerverifiedShow Answer

Which statement is an accurate description of water molecules?

Correct AnswerverifiedShow Answer

The human body must maintain a constant pH. In the blood, bicarbonate serves as a(n) to help maintain the necessary pH.

Correct AnswerverifiedShow Answer

For an atom to achieve maximum stability and become chemically inert, what must occur?

Correct AnswerverifiedShow Answer

Radioactive isotopes are biological tools that are often used to

Correct AnswerverifiedShow Answer

In general, a substance that carries an electric charge can dissolve in water. Given this fact, which of the following would most likely NOT dissolve in water?

Correct AnswerverifiedShow Answer

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A base is a solution with a co...
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Two electrons completely fill ...
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