Question 1

Free radicals are considered dangerous because they:

Accepted Answer

A)  attack the atomic nucleus.
B)  emit dangerous radiation.
C)  steal electrons from other atoms, causing them to become free radicals.
D)  damage oxygen and cause it to become an antioxidant.

Question 2

How does a base differ from an acid?

Accepted Answer

A base is a solution with a co...

Question 3

Which statement is an accurate description of water molecules?

Accepted Answer

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

Question 4

You drop a handful of salt into a glass of water. Which of the following BEST describes what is happening inside the glass at the molecular level?

Accepted Answer

A)  The positively charged hydrogen ends of the water molecules are attracted to sodium ions.
B)  The positively charged hydrogen ends of the water molecules are attracted to chloride ions.
C)  Sodium and chloride ions form a covalent bond.
D)  Water and sodium form a covalent bond.

Question 5

The element carbon has atomic number 6. Carbon most likely:

Accepted Answer

A)  forms an ionic bond.
B)  forms four covalent bonds.
C)  forms two covalent bonds.
D)  donates two electrons to another atom.

Question 6

Which of the following BEST explains why a particular atom may not form compounds readily?

Accepted Answer

A)  The atom has no electrons.
B)  The atom has an uneven number of protons.
C)  The atom has seven electrons in its outer shell.
D)  The atom's outer energy shells are completely full.

Question 7

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

Accepted Answer

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

Question 8

If you place a feather on the surface of a bowl of water, the feather remains suspended on the surface due to the:

Accepted Answer

A)  surface tension of the water.
B)  fact that water is a good solvent.
C)  polarity of the water.
D)  density of the water.

Question 9

What is meant by the statement that water has a high specific heat?

Accepted Answer

A)  It can absorb a lot of energy without changing temperature.
B)  It grows hot very quickly.
C)  The boiling point of water is very low.
D)  Water can heat up to only a certain temperature.
E)  Water freezes easily.

Question 10

Different types of living matter often have different forms of the same elements in their bodies. For example, the nitrogen in an animal often has a slightly different atomic structure than the nitrogen in a plant. Recently, nutritionists have discovered how to deduce the diets of various animal species by examining the type of nitrogen (and other elements) inside their bodies. What is the chemical basis behind this scenario?

Accepted Answer

A)  Antioxidants buffer the potential damage that free radicals do to cells.
B)  Radioactive elements can be used to trace the paths of molecules through the body.
C)  Hydrophobic interactions keep water molecules from forming bonds with fats and oils.
D)  Isotopes have the same atomic number but different atomic masses.
E)  Covalent bonds result when two atoms share electrons.

Question 11

A neutral solution:

Accepted Answer

A)  has no H+.
B)  has no OH- .
C)  has equal amounts of H+ and OH- .
D)  is hydrophobic.
E)  has a pH of 0.

Question 12

As ice melts, it:

Accepted Answer

A)  absorbs heat from its surroundings.
B)  becomes less dense.
C)  increases its property of cohesion.
D)  increases its heat of vaporization.

Question 13

Isotopes are atoms of the same element that have different numbers of protons. True or False?

Accepted Answer

A) True 
 B)False

Question 14

What type of bond is easily disrupted in aqueous solutions?

Accepted Answer

A)  covalent
B)  polar covalent
C)  ionic

Question 15

Molecules that are electrically attracted to water molecules are ________.

Accepted Answer

The answer of Molecules that are electrically attracted to water...

Question 16

A single covalent chemical bond represents the sharing of how many electrons?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  6

Question 17

Which of the following results from an unequal sharing of electrons between atoms?

Accepted Answer

A)  nonpolar covalent bond
B)  polar covalent bond
C)  ionic bond
D)  hydrogen bond
E)  electronproton interaction

Question 18

The formation of ions involves the:

Accepted Answer

A)  sharing of electrons.
B)  gain or loss of electrons.
C)  gain or loss of protons.
D)  sharing of protons.
E)  gain or loss of neutrons.

Question 19

If you examined the human body, which of the following combinations of elements would be most common?

Accepted Answer

A)  C, O, P, S
B)  C, Na, O, N
C)  Cl, Ca, C, H
D)  C, S, Ca, N
E)  O, N, H, C

Question 20

All snowflakes have six sides because of the hexagonal crystal array of frozen water molecules. True or False?

Accepted Answer

A) True 
 B)False

Exam 2: Atoms, Molecules, and Life

All snowflakes have six sides because of the hexagonal crystal array of frozen water molecules. True or False?

Correct Answer
verified

If you place a feather on the surface of a bowl of water, the feather remains suspended on the surface due to the:

Correct Answer
verified

Molecules that are electrically attracted to water molecules are ________.

Correct Answer
verified

Which of the following BEST explains why a particular atom may not form compounds readily?

Correct Answer
verified

Isotopes are atoms of the same element that have different numbers of protons. True or False?

Correct Answer
verified

A single covalent chemical bond represents the sharing of how many electrons?

Correct Answer
verified

How does a base differ from an acid?

Correct Answer
verified
A base is a solution with a co...
View Answer

If you examined the human body, which of the following combinations of elements would be most common?

Correct Answer
verified

Which of the following results from an unequal sharing of electrons between atoms?

Correct Answer
verified

As ice melts, it:

Correct Answer
verified

You drop a handful of salt into a glass of water. Which of the following BEST describes what is happening inside the glass at the molecular level?

Correct Answer
verified

What type of bond is easily disrupted in aqueous solutions?

Correct Answer
verified

Which statement is an accurate description of water molecules?

Correct Answer
verified

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

Correct Answer
verified

A neutral solution:

Correct Answer
verified

Correct Answer
verified

Free radicals are considered dangerous because they:

Correct Answer
verified

The element carbon has atomic number 6. Carbon most likely:

Correct Answer
verified

What is meant by the statement that water has a high specific heat?

Correct Answer
verified

The formation of ions involves the:

Correct Answer
verified

Exam 2: Atoms, Molecules, and Life

All snowflakes have six sides because of the hexagonal crystal array of frozen water molecules. True or False?

Correct AnswerverifiedShow Answer

If you place a feather on the surface of a bowl of water, the feather remains suspended on the surface due to the:

Correct AnswerverifiedShow Answer

Molecules that are electrically attracted to water molecules are ________.

Correct AnswerverifiedShow Answer

Which of the following BEST explains why a particular atom may not form compounds readily?

Correct AnswerverifiedShow Answer

Isotopes are atoms of the same element that have different numbers of protons. True or False?

Correct AnswerverifiedShow Answer

A single covalent chemical bond represents the sharing of how many electrons?

Correct AnswerverifiedShow Answer

How does a base differ from an acid?

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

If you examined the human body, which of the following combinations of elements would be most common?

Correct AnswerverifiedShow Answer

Which of the following results from an unequal sharing of electrons between atoms?

Correct AnswerverifiedShow Answer

As ice melts, it:

Correct AnswerverifiedShow Answer

You drop a handful of salt into a glass of water. Which of the following BEST describes what is happening inside the glass at the molecular level?

Correct AnswerverifiedShow Answer

What type of bond is easily disrupted in aqueous solutions?

Correct AnswerverifiedShow Answer

Which statement is an accurate description of water molecules?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A neutral solution:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Free radicals are considered dangerous because they:

Correct AnswerverifiedShow Answer

The element carbon has atomic number 6. Carbon most likely:

Correct AnswerverifiedShow Answer

What is meant by the statement that water has a high specific heat?

Correct AnswerverifiedShow Answer

The formation of ions involves the:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A base is a solution with a co...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified