Question 1

What is a trace element?

Accepted Answer

A)   An element that is very rare
B)   An element that is evenly distributed on the planet
C)   An element that is required in miniscule amounts for life
D)   An element that is used to identify the location of other elementsE) None of the above
F) B) and D)

Question 2

Based on the suffix,a molecule of "maltose" is most likely what type of macromolecule?

Accepted Answer

A)   Carbohydrate
B)   Lipid
C)   Protein
D)   Nucleic acidE) B) and D)
F) B) and C)

Question 3

While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom,almost all of the smaller atoms (atomic numbers 2-20) are considered stable (nonreactive) when they contain ________ electron(s) in the outermost shell.

Accepted Answer

A)   1
B)   2
C)   8
D)   16E) C) and D)
F) None of the above

Question 4

Individual water molecules are held to one another by relatively weak ________ bonds.

Accepted Answer

A)   covalent
B)   hydrogen
C)   ionic
D)   nonpolarE) A) and C)
F) A) and D)

Question 5

Which of the following represents a simple sugar (also called monosaccharides) ?

Accepted Answer

A)   Lactose
B)   Cellulose
C)   Glucose
D)   Sucrose (table sugar) E) B) and D)
F) C) and D) C

Question 6

Why is one side of a single water molecule partially negative while the other side is partially positive?

Accepted Answer

A)   Electron pairs are unevenly shared between the oxygen atom and the two hydrogen atoms.
B)   Electron pairs are unevenly shared between the two hydrogen atoms.
C)   Oxygen donates its electrons to hydrogen.
D)   Hydrogen donates its electrons to oxygen.E) B) and C)
F) A) and B)

Question 7

All lipids are ________.

Accepted Answer

A)   water-loving molecules
B)   hydrophilic
C)   hydrophobic
D)   hydrolyticE) C) and D)
F) A) and B)

Question 8

The chemical name for table salt is sodium chloride,or simply NaCl.What type of chemical is NaCl?

Accepted Answer

A)   Compound
B)   Element
C)   Molecule
D)   IonE) A) and B)
F) All of the above

Question 9

Select the most complete explanation of what the pH scale measures.

Accepted Answer

A)   The acidity of a solvent
B)   The alkalinity of a solvent
C)   The concentration of hydrogen ions in a solution
D)   The concentration of hydroxide ions in a soluteE) A) and D)
F) B) and D)

Question 10

What is the maximum number of single covalent bonds a carbon atom can form with other elements?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) C) and D)
F) B) and C)

Question 11

What is another name for the polymers of carbohydrates?

Accepted Answer

A)   Triglycerides
B)   Polysaccharides
C)   Polypeptides
D)   NucleotidesE) None of the above
F) A) and B)

Question 12

The bond in which bonded atoms share electrons is called a(n) ________.

Accepted Answer

A)   ionic bond
B)   covalent bond
C)   hydrogen bond
D)   polar bondE) A) and B)
F) None of the above

Question 13

What will be accomplished by lowering the activation energy of a reaction?

Accepted Answer

A)   The reaction will proceed more slowly.
B)   The reaction will proceed more quickly.
C)   The reaction will stop completely.
D)   The reaction will reverse.E) A) and D)
F) B) and C) B

Question 14

If the number of protons in an atom does not match the number of electrons,the atom is called an ________.

Accepted Answer

A)   element
B)   isotope
C)   isomer
D)   ionE) None of the above
F) A) and B)

Question 15

How many neutrons are in a typical oxygen atom?

Accepted Answer

A)   8
B)   12
C)   18
D)   Not enough information givenE) A) and C)
F) All of the above

Question 16

What are the four classes of large organic molecules important to life on Earth?

Accepted Answer

A)   Carbohydrates, lipids, proteins, and enzymes
B)   Carbohydrates, lipids, proteins, and sugars
C)   Carbohydrates, proteins, nucleic acids, and sugars
D)   Carbohydrates, proteins, lipids, and nucleic acidsE) A) and C)
F) B) and D) D

Question 17

The typical carbon atom is described in the periodic table by the accompanying box.How many protons are in a typical oxygen atom?

Accepted Answer

A)   8
B)   12
C)   18
D)   Not enough information givenE) All of the above
F) A) and D)

Question 18

Identify the part of the atom that most determines the chemical properties of the atom.

Accepted Answer

A)   The number of shells
B)   The number of protons
C)   The number of neutrons
D)   The number of electronsE) A) and B)
F) A) and C)

Question 19

Which of the following large organic molecules include table sugar?

Accepted Answer

A)   Carbohydrates
B)   Lipids
C)   Proteins
D)   Nucleic acidsE) A) and B)
F) None of the above

Question 20

What are the ecological consequences of acidification of rain and oceans?

Accepted Answer

A)   They damage the health of ecosystems.
B)   They do not have any consequences on ecosystems.
C)   They improve the health of ecosystems.
D)   Acid rain damages ecosystems, but ocean acidification improves the health of oceans.E) All of the above
F) C) and D)

Exam 2: The Chemistry of Life

What is a trace element?

Correct AnswerverifiedShow Answer

Based on the suffix,a molecule of "maltose" is most likely what type of macromolecule?

Correct AnswerverifiedShow Answer

While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom,almost all of the smaller atoms (atomic numbers 2-20) are considered stable (nonreactive) when they contain ________ electron(s) in the outermost shell.

Correct AnswerverifiedShow Answer

Individual water molecules are held to one another by relatively weak ________ bonds.

Correct AnswerverifiedShow Answer

Which of the following represents a simple sugar (also called monosaccharides) ?

Correct AnswerverifiedC

Why is one side of a single water molecule partially negative while the other side is partially positive?

Correct AnswerverifiedShow Answer

All lipids are ________.

Correct AnswerverifiedShow Answer

The chemical name for table salt is sodium chloride,or simply NaCl.What type of chemical is NaCl?

Correct AnswerverifiedShow Answer

Select the most complete explanation of what the pH scale measures.

Correct AnswerverifiedShow Answer

What is the maximum number of single covalent bonds a carbon atom can form with other elements?

Correct AnswerverifiedShow Answer

What is another name for the polymers of carbohydrates?

Correct AnswerverifiedShow Answer

The bond in which bonded atoms share electrons is called a(n) ________.

Correct AnswerverifiedShow Answer

What will be accomplished by lowering the activation energy of a reaction?

Correct AnswerverifiedB

If the number of protons in an atom does not match the number of electrons,the atom is called an ________.

Correct AnswerverifiedShow Answer

How many neutrons are in a typical oxygen atom?

Correct AnswerverifiedShow Answer

What are the four classes of large organic molecules important to life on Earth?

Correct AnswerverifiedD

The typical carbon atom is described in the periodic table by the accompanying box.How many protons are in a typical oxygen atom?

Correct AnswerverifiedShow Answer

Identify the part of the atom that most determines the chemical properties of the atom.

Correct AnswerverifiedShow Answer

Which of the following large organic molecules include table sugar?

Correct AnswerverifiedShow Answer

What are the ecological consequences of acidification of rain and oceans?

Correct AnswerverifiedShow Answer

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C

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B

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D

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