Question 1

Adenine and thymine are examples of double-ring nitrogenous bases called pyrimidines.

Accepted Answer

A) True 
 B)False

Question 2

When diagramming an atom,the innermost shell is filled with ______ electrons.

Accepted Answer

A)  two
B)  six
C)  eight
D)  tenE) B) and D)
F) A) and B)

Question 3

Starch and cellulose are examples of polysaccharides found in plants.

Accepted Answer

A) True 
 B)False

Question 4

An atomic nucleus consists of protons and neutrons and is positively charged.

Accepted Answer

A) True 
 B)False

Question 5

When a protein of 50 nanometers is mixed with water,the opaque result is called a(n)

Accepted Answer

A)  suspension.
B)  emulsion.
C)  solution.
D)  colloid.E) A) and D)
F) A) and C)

Question 6

When water mixtures are formed,the components are chemically altered and the new molecular bonds can be separated only by chemical means.

Accepted Answer

A) True 
 B)False

Question 7

Chemical barriers composed of phospholipid bilayers form within biological systems because

Accepted Answer

A)  cells expend ATP to position the phospholipid tails close together.
B)  hydrophobic exclusion results in the close positioning of the nonpolar tails.
C)  van der Waals forces attract the polar heads to the water inside the cell.
D)  the inability of the polar heads to dissolve in water causes the heads to adhere to one another.E) B) and D)
F) B) and C)

Question 8

Inorganic molecules contain carbon.

Accepted Answer

A) True 
 B)False

Question 9

The molecular formula of chlorine gas is Cl2.One molecule of this gas would be attracted to another by

Accepted Answer

A)  polar covalent bonds.
B)  van der Waals forces.
C)  ionic bonds.
D)  hydrogen bonds.
E)  intramolecular forces.F) A) and D)
G) A) and E)

Question 10

Consider an atom with four electrons in its outer shell.If that atom is covalently bound to three other atoms within a molecule,then it is

Accepted Answer

A)  in a double bond with one atom and in single bonds with two atoms.
B)  in a single bond with one atom and in double bonds with two atoms.
C)  in a triple bond with one atom and in single bonds with two atoms.
D)  in double bonds with all three atoms.
E)  in single bonds with all three atoms.F) C) and D)
G) B) and D)

Question 11

An individual hydrogen bond in a sample of water would be described as

Accepted Answer

A)  strong and intramolecular.
B)  strong and intermolecular.
C)  weak and intramolecular.
D)  weak and intermolecular.E) C) and D)
F) B) and D)

Question 12

Water and sodium chloride are examples of inorganic molecules.

Accepted Answer

A) True 
 B)False

Question 13

Given a watery solution in which 1/1,000,000 particles are free H+ions,what will the pH be

Accepted Answer

A)  2
B)  5
C)  6
D)  7
E)  10F) B) and E)
G) A) and E)

Question 14

Positively charged ions are called cations.

Accepted Answer

A) True 
 B)False

Question 15

When atoms of elements on the left side of the periodic table ionize,they tend to

Accepted Answer

A)  gain electrons and therefore become anions.
B)  gain protons and therefore become anions.
C)  lose electrons and therefore become cations.
D)  lose protons and therefore become cations.
E)  add neutrons and therefore become megaions.F) B) and E)
G) All of the above

Question 16

Hydrogen bonds form between molecules containing _________ bonds;the hydrogen bond is between a hydrogen atom of one molecule and a partially _________ charged atom of another.

Accepted Answer

A)  polar covalent;negatively
B)  polar covalent;positively
C)  nonpolar covalent;positively
D)  nonpolar covalent;negatively
E)  ionic;positivelyF) C) and D)
G) A) and C)

Question 17

Surfactant is necessary to prevent collapse of the alveoli in the lung because in its absence water molecules

Accepted Answer

A)  vaporize and take up much less space.
B)  are more strongly attracted to each other by van der Waals forces.
C)  are more strongly attracted to each other by cohesive forces.
D)  congregate around nearby proteins to which they adhere.E) C) and D)
F) B) and C)

Question 18

Any molecule that contains a polar bond within it is a polar molecule.

Accepted Answer

A) True 
 B)False

Question 19

The molecular formula for bicarbonate ion is HCO3-.It is therefore a

Accepted Answer

A)  polyatomic anion.
B)  polyatomic cation.
C)  radioactive isotope.
D)  cationic compound.E) B) and D)
F) All of the above

Question 20

For every atom of carbon in a carbohydrate

Accepted Answer

A)  there is approximately one atom of hydrogen.
B)  there are approximately two atoms of hydrogen.
C)  there are approximately three atoms of hydrogen.
D)  there are approximately four atoms of hydrogenE) A) and C)
F) C) and D)

Exam 2: Atoms,Ions,and Molecules

Consider an atom with four electrons in its outer shell.If that atom is covalently bound to three other atoms within a molecule,then it is

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Chemical barriers composed of phospholipid bilayers form within biological systems because

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Given a watery solution in which 1/1,000,000 particles are free H+ions,what will the pH be

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Water and sodium chloride are examples of inorganic molecules.

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Positively charged ions are called cations.

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When a protein of 50 nanometers is mixed with water,the opaque result is called a(n)

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Starch and cellulose are examples of polysaccharides found in plants.

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When atoms of elements on the left side of the periodic table ionize,they tend to

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An atomic nucleus consists of protons and neutrons and is positively charged.

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Inorganic molecules contain carbon.

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For every atom of carbon in a carbohydrate

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When water mixtures are formed,the components are chemically altered and the new molecular bonds can be separated only by chemical means.

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Surfactant is necessary to prevent collapse of the alveoli in the lung because in its absence water molecules

Correct AnswerverifiedShow Answer

Adenine and thymine are examples of double-ring nitrogenous bases called pyrimidines.

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Hydrogen bonds form between molecules containing _________ bonds;the hydrogen bond is between a hydrogen atom of one molecule and a partially _________ charged atom of another.

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Any molecule that contains a polar bond within it is a polar molecule.

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An individual hydrogen bond in a sample of water would be described as

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The molecular formula of chlorine gas is Cl2.One molecule of this gas would be attracted to another by

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When diagramming an atom,the innermost shell is filled with ______ electrons.

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The molecular formula for bicarbonate ion is HCO3-.It is therefore a

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Given a watery solution in which 1/1,000,000 particles are free H⁺ions,what will the pH be

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Hydrogen bonds form between molecules containing _ bonds;the hydrogen bond is between a hydrogen atom of one molecule and a partially _ charged atom of another.

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The molecular formula of chlorine gas is Cl₂.One molecule of this gas would be attracted to another by

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The molecular formula for bicarbonate ion is HCO₃^-.It is therefore a

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