Question 1

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

Accepted Answer

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

Question 2

Inorganic molecules contain carbon.

Accepted Answer

A) True 
 B)False

Question 3

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 4

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) A) and E)
G) A) and C)

Question 5

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) B) and C)
F) None of the above

Question 6

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 E)
G) A) and C)

Question 7

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) C) and D)
F) B) and C)

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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) A) and B)
F) None of the above

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

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) C) and D)
G) A) and B)

Question 13

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) B) and C)
F) A) and D)

Question 14

Water and sodium chloride are examples of inorganic molecules.

Accepted Answer

A) True 
 B)False

Question 15

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) All of the above
F) A) and B)

Question 16

Positively charged ions are called cations.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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) A) and B)
G) B) and E)

Question 19

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) All of the above
F) C) and D)

Question 20

Starch and cellulose are examples of polysaccharides found in plants.

Accepted Answer

A) True 
 B)False

Exam 2: Atoms,Ions,and Molecules

Chemical barriers composed of phospholipid bilayers form within biological systems because

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

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

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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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Starch and cellulose are examples of polysaccharides found in plants.

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

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

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Inorganic molecules contain carbon.

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

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Water and sodium chloride are examples of inorganic molecules.

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

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For every atom of carbon in a carbohydrate

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Positively charged ions are called cations.

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

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

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

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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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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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