Question 1

A(n)  __________ is formed when two atoms share electrons.

Accepted Answer

A)   ion
B)   ionic bond
C)   hydrogen bond
D)   covalent bond
E)   atomF) All of the above
G) None of the above

Question 2

According to the law of conservation of energy, the total energy of the universe is:

Accepted Answer

A)   constant
B)   increasing exponentially
C)   decreasing exponentially
D)   increasing linearly
E)   decreasing linearly.F) B) and D)
G) B) and C)

Question 3

Chemicals that resist changes in pH when acids or bases are added to a solution are

Accepted Answer

A)   acids.
B)   bases.
C)   salts.
D)   buffers.E) B) and C)
F) A) and D)

Question 4

Which of these is an organic molecule?

Accepted Answer

A)   H2O
B)   H2CO3
C)   CO2
D)   NaCl
E)   CaCl2F) A) and D)
G) B) and D)

Question 5

A solution with a pH of 4 would have _____ hydrogen ions than a solution with a pH of 6.

Accepted Answer

A)   2 times more
B)   2 times fewer
C)   20 times more
D)   20 times fewer
E)   100 times moreF) A) and B)
G) B) and E)

Question 6

The chemical notation for Magnesium ions is Mg+2. The designation 2+ indicates that:

Accepted Answer

A)   two electrons have been lost
B)   two protons have been gained
C)   the ion is negatively charged
D)   the atomic number is two
E)   the number of electrons equals the number of protons.F) A) and B)
G) A) and C)

Question 7

The conversion between different states of energy (e.g. potential energy to kinetic energy) :

Accepted Answer

A)   is not 100% efficent
B)   is 100% efficent
C)   typically generates heat
D)   is not possible, energy can not change its state.
E)   is not 100% efficent and typically generates heatF) A) and B)
G) A) and C)

Question 8

If the products of a chemical reaction contain less potential energy than the reactants,

Accepted Answer

A)   energy has been stored in the molecular bonds of the product.
B)   energy has been released by the breaking of molecular bonds.
C)   the reaction will be reversible without additional energy input.
D)   a synthesis reaction is likely to have occurred.
E)   All of these choices are correct.F) C) and D)
G) A) and E)

Question 9

A(n)  __________ is formed when one atom loses an electron and another atom accepts that electron.

Accepted Answer

A)   ion
B)   ionic bond
C)   hydrogen bond
D)   covalent bond
E)   atomF) A) and D)
G) A) and C)

Question 10

Which of these statements concerning lipids is NOT true?

Accepted Answer

A)   The building blocks of fats (triglycerides)  are fatty acids and glycerol.
B)   A fatty acid that contains only single covalent bonds between the carbon atoms is called unsaturated.
C)   Fats, phospholipids, and steroids are lipids.
D)   Lipids are substances that dissolve in nonpolar solvents.E) All of the above
F) B) and C)

Question 11

__________ is formed by the reaction of an acid and a base.

Accepted Answer

A)   An acid
B)   A base
C)   A salt
D)   A bufferE) A) and D)
F) B) and D)

Question 12

Sucrose is an example of

Accepted Answer

A)   a monosaccharide.
B)   a lipid.
C)   a disaccharide.
D)   an inorganic molecule.
E)   a polysaccharide.F) C) and E)
G) B) and D)

Question 13

Atom Y has 11 protons, 11 electrons, and 12 neutrons. What is the mass number of Atom Y?

Accepted Answer

A)   11
B)   12
C)   22
D)   23
E)   24F) B) and C)
G) A) and E)

Question 14

Substances that donate hydrogen ions (protons)  to a solution are called

Accepted Answer

A)   acids.
B)   bases.
C)   alkaline.
D)   salts.E) B) and C)
F) A) and C)

Question 15

Atoms that have gained or lost electrons are called

Accepted Answer

A)   ions.
B)   covalents.
C)   nonpolars.
D)   molecules.
E)   neutrons.F) A) and B)
G) D) and E)

Question 16

The building blocks for proteins are

Accepted Answer

A)   monosaccharides.
B)   disaccharides.
C)   glycerol + fatty acids.
D)   nucleotides.
E)   amino acids.F) A) and E)
G) B) and E)

Question 17

Which of the following processes represents a synthesis reaction?

Accepted Answer

A)   glycolysis
B)   the creation of a protein from amino acids
C)   glycogenolysis
D)   All of these are synthesis reactions.E) A) and B)
F) A) and C)

Question 18

The mass number of an element is:

Accepted Answer

A)   the number of neutrons in the atom.
B)   the number of protons in the atom.
C)   the sum of the number of protons plus the number of neutrons.
D)   the sum of the number of protons plus the number of electrons.
E)   the sum of the number of neutrons plus the number of electronsF) A) and E)
G) B) and D)

Question 19

___________ are a common fuel nutrient that has glycogen as a storage form.

Accepted Answer

A)   Carbohydrates
B)   Lipids
C)   Proteins
D)   Nucleic acidsE) All of the above
F) B) and D)

Question 20

Which of the following is considered a compound but not a molecule?

Accepted Answer

A)   water (H20) .
B)   sodium chloride (NaCl) .
C)   calcium (Ca2+) 
D)   glucose (C6H12O6) 
E)   all of these are compounds and molecules.F) D) and E)
G) A) and C)

Exam 2: The Chemical Basis of Life

Atom Y has 11 protons, 11 electrons, and 12 neutrons. What is the mass number of Atom Y?

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Atoms that have gained or lost electrons are called

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A solution with a pH of 4 would have _____ hydrogen ions than a solution with a pH of 6.

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___________ are a common fuel nutrient that has glycogen as a storage form.

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Sucrose is an example of

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The conversion between different states of energy (e.g. potential energy to kinetic energy) :

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Substances that donate hydrogen ions (protons) to a solution are called

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The chemical notation for Magnesium ions is Mg+2. The designation 2+ indicates that:

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Which of these statements concerning lipids is NOT true?

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If the products of a chemical reaction contain less potential energy than the reactants,

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Which of the following processes represents a synthesis reaction?

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The building blocks for proteins are

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According to the law of conservation of energy, the total energy of the universe is:

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A(n) __________ is formed when two atoms share electrons.

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A(n) __________ is formed when one atom loses an electron and another atom accepts that electron.

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Which of these is an organic molecule?

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__________ is formed by the reaction of an acid and a base.

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The mass number of an element is:

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Chemicals that resist changes in pH when acids or bases are added to a solution are

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Which of the following is considered a compound but not a molecule?

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The chemical notation for Magnesium ions is Mg⁺². The designation 2+ indicates that:

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