Question 1

Ions in an ionic molecule are held together due to

Accepted Answer

A)  the sharing of electrons.
B)  the attraction of opposite electrical charges.
C)  each electron orbiting all of the ions in the molecule.
D)  the presence of water molecules.
E)  the attraction of similar charges of the ions' protons.F) A) and E)
G) All of the above

Question 2

A(n)________ is a pure substance composed of atoms of only one kind.

Accepted Answer

The answer of A(n)________ is a pure substance composed of...

Question 3

Radioisotopes have unstable

Accepted Answer

A)  ions.
B)  nuclei.
C)  isotopes.
D)  electron clouds.
E)  protons.F) C) and D)
G) A) and E)

Question 4

The center of an atom is called the ________.

Accepted Answer

The answer of The center of an atom is called...

Question 5

Helium (He) has an atomic number of 2. It is chemically stable because it

Accepted Answer

A)  is neutral in electrical charge.
B)  readily ionizes to react with other atoms.
C)  has a full outer electron shell.
D)  will form a covalent bond with another He atom.
E)  lacks electrons,thus the He atom is stable.F) A) and B)
G) A) and C)

Question 6

Which one of the following statements is not correct about the reaction H₂ + Cl₂ → 2 HCl?

Accepted Answer

A)  H₂ and Cl₂ are the reactants.
B)  HCl is the product.
C)  One molecule of hydrogen contains two atoms.
D)  Two molecules of HCl are formed in the reaction.
E)  This reaction is easily reversible.F) A) and C)
G) A) and B)

Question 7

According to the rules of complementary base pairing in nucleic acids,cytosine would pair with the base

Accepted Answer

A)  thymine.
B)  adenine.
C)  uracil.
D)  cytosine.
E)  guanine.F) A) and D)
G) A) and B)

Question 8

Hydrophilic molecules readily associate with

Accepted Answer

A)  lipid molecules.
B)  hydrophobic molecules.
C)  water molecules.
D)  acids.
E)  salts.F) A) and B)
G) All of the above

Question 9

The most abundant high-energy compound in cells is

Accepted Answer

A)  DNA.
B)  adenosine diphosphate.
C)  adenosine monophosphate.
D)  adenosine triphosphate.
E)  RNA.F) A) and B)
G) B) and D)

Question 10

Compounds that can be synthesized or broken down by chemical reactions inside the body are called

Accepted Answer

A)  inorganic compounds.
B)  organic compounds.
C)  nutrients.
D)  metabolites.
E)  enzymes.F) A) and E)
G) A) and D)

Question 11

All of the following are true concerning enzymes,except that they

Accepted Answer

A)  are proteins.
B)  function as biological catalysts.
C)  lower the activation energy required for a reaction.
D)  affect only the rate of a chemical reaction.
E)  are consumed during the reaction.F) A) and E)
G) A) and B)

Question 12

Compounds that contain carbon as the primary structural atom are called ________ molecules.

Accepted Answer

The answer of Compounds that contain carbon as the primary...

Question 13

In the reaction listed below,what coefficient needs to be added to balance the equation? 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + ________ O₂

Accepted Answer

A)  2
B)  4
C)  6
D)  8
E)  10F) A) and E)
G) A) and B)

Question 14

An example of an organic substance is:

Accepted Answer

A)  sucrose
B)  carbonic acid
C)  sodium chloride
D)  oxygen
E)  nitric oxideF) A) and B)
G) C) and D)

Question 15

Most of the fat found in the human body is in the form of

Accepted Answer

A)  cholesterol.
B)  phospholipids.
C)  triglycerides.
D)  prostaglandins.
E)  monoglycerides.F) D) and E)
G) A) and C)

Question 16

In living cells,complex metabolic reactions proceed in a series of steps called a(n)________.

Accepted Answer

The answer of In living cells,complex metabolic reactions proceed in...

Question 17

Ions with a negative charge are called ________.

Accepted Answer

The answer of Ions with a negative charge are called...

Question 18

If an isotope of oxygen has 8 protons,10 neutrons,and 8 electrons,its mass number is

Accepted Answer

A)  26.
B)  16.
C)  18.
D)  8) 
E)  12.F) C) and D)
G) A) and B)

Question 19

When electrons are transferred from one atom to another,and the two atoms unite as a result of the opposite charges,

Accepted Answer

A)  an ion is formed.
B)  a molecule is formed.
C)  a hydrogen bond is formed.
D)  an ionic bond is formed.
E)  a covalent bond is formed.F) None of the above
G) A) and D)

Question 20

Oppositely charged ions in solution are prevented from combining by

Accepted Answer

A)  heat capacity of water.
B)  hydration spheres.
C)  water's nonpolar nature.
D)  free radicals.
E)  hydrogen bonding.F) A) and B)
G) C) and D)

Exam 2: The Chemical Level of Organization

Ions in an ionic molecule are held together due to

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The center of an atom is called the ________.

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The most abundant high-energy compound in cells is

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Ions with a negative charge are called ________.

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When electrons are transferred from one atom to another,and the two atoms unite as a result of the opposite charges,

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If an isotope of oxygen has 8 protons,10 neutrons,and 8 electrons,its mass number is

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Compounds that can be synthesized or broken down by chemical reactions inside the body are called

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Radioisotopes have unstable

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All of the following are true concerning enzymes,except that they

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Compounds that contain carbon as the primary structural atom are called ________ molecules.

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Oppositely charged ions in solution are prevented from combining by

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Helium (He) has an atomic number of 2. It is chemically stable because it

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Hydrophilic molecules readily associate with

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According to the rules of complementary base pairing in nucleic acids,cytosine would pair with the base

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In living cells,complex metabolic reactions proceed in a series of steps called a(n)________.

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An example of an organic substance is:

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Which one of the following statements is not correct about the reaction H₂ + Cl₂ → 2 HCl?

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A(n)________ is a pure substance composed of atoms of only one kind.

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In the reaction listed below,what coefficient needs to be added to balance the equation? 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + ________ O₂

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Most of the fat found in the human body is in the form of

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