Question 1

Figure 2-2
Use the figure below to answer the corresponding question(s).  
-Figure 2-2 represents:

Accepted Answer

A)  elemental helium. 
B)  molecular hydrogen. 
C)  molecular helium. 
D)  a water molecule. 
E)  molecular oxygen. 
A)  elemental helium. 
B)  molecular hydrogen. 
C)  molecular helium. 
D)  a water molecule. 
E)  molecular oxygen. B

Question 2

When atoms react to form an ionic bond, electrons are shared between those atoms.
__________________

Accepted Answer

A) True 
 B)False  False

Question 3

A solution having a pH of 8 is slightly acidic.
__________________

Accepted Answer

A) True 
 B)False  False

Question 4

Figure 2-1
Use the figure below to answer the corresponding question(s).  
-Figure 2-1 represents:

Accepted Answer

A)  two isotopes of the same element. 
B)  two different elements. 
C)  two different ions. 
D)  an acid and a base. 
E)  a cation and an anion. 
A)  two isotopes of the same element. 
B)  two different elements. 
C)  two different ions. 
D)  an acid and a base. 
E)  a cation and an anion.

Question 5

When a chemical reaction is at equilibrium:

Accepted Answer

A)  the forward reaction is going faster. 
B)  the reverse reaction is going faster. 
C)  the forward and reverse reactions are proceeding at equal rates. 
D)  the forward reaction stops. 
E)  the reverse reaction stops. 
A)  the forward reaction is going faster. 
B)  the reverse reaction is going faster. 
C)  the forward and reverse reactions are proceeding at equal rates. 
D)  the forward reaction stops. 
E)  the reverse reaction stops.

Question 6

The particular type of element is determined by the number of:

Accepted Answer

A)  electrons 
B)  protons 
C)  neutrons 
D)  valence electrons 
E)  energy levels 
A)  electrons 
B)  protons 
C)  neutrons 
D)  valence electrons 
E)  energy levels

Question 7

Match the term with its description:
a.adhesion
c.surface tension
b.cohesion
d.capillary action
-Responsible for the ability of water molecules to move in the microscopic spaces between soil particles

Accepted Answer

The answer of Match the term with its description:
a.adhesion
c.surface tension
b.cohesion
d.capillary...

Question 8

Identify the chemical(s) that act(s) as a buffer in human blood:

Accepted Answer

A)  bicarbonate 
B)  hydrogen ions 
C)  carbon dioxide 
D)  water 
E)  hydroxide ions 
A)  bicarbonate 
B)  hydrogen ions 
C)  carbon dioxide 
D)  water 
E)  hydroxide ions

Question 9

Radioisotopes are used in all of the following scientific applications except:

Accepted Answer

A)  dating fossils. 
B)  determining the sequence of genetic information in DNA. 
C)  localization of a drug, such as marijuana. 
D)  the treatment of cancer. 
E)  measuring the pH of the blood. 
A)  dating fossils. 
B)  determining the sequence of genetic information in DNA. 
C)  localization of a drug, such as marijuana. 
D)  the treatment of cancer. 
E)  measuring the pH of the blood.

Question 10

The tetrahedron shape of a methane molecule is the result of orbital hybridization.
__________________

Accepted Answer

A) True 
 B)False

Question 11

MATCHING
Match the type of bond or interaction with its description.
a.hydrogen bond
c.ionic bond
b.van de Waals interaction
d.covalent bond
-Strong attractive force resulting from the sharing of electrons between atoms

Accepted Answer

The answer of MATCHING
Match the type of bond or interaction...

Question 12

Figure 2-1
Use the figure below to answer the corresponding question(s).  
-Isotopes differ from each other with respect to the number of:

Accepted Answer

A)  protons only. 
B)  electrons only. 
C)  neutrons only. 
D)  both protons and electrons. 
E)  both neutrons and protons. 
A)  protons only. 
B)  electrons only. 
C)  neutrons only. 
D)  both protons and electrons. 
E)  both neutrons and protons.

Question 13

List the four elements that account for over 90% of the mass of living organisms and identify an important biological function of each element.

Accepted Answer

Some examples from Table 2-1: Oxygen is

Question 14

Match the term with its description:
a.adhesion
c.surface tension
b.cohesion
d.capillary action
-Sticking together of unlike molecules

Accepted Answer

The answer of Match the term with its description:
a.adhesion
c.surface tension
b.cohesion
d.capillary...

Question 15

The difference between a stable isotope and a radioisotope is that:

Accepted Answer

A)  the stable isotope emits radiation. 
B)  the radioisotope emits radiation. 
C)  the stable isotope emits light. 
D)  the stable isotope absorbs radiation. 
E)  the radioisotope has an unequal number of protons and electrons. 
A)  the stable isotope emits radiation. 
B)  the radioisotope emits radiation. 
C)  the stable isotope emits light. 
D)  the stable isotope absorbs radiation. 
E)  the radioisotope has an unequal number of protons and electrons.

Question 16

Compare and contrast the formation, properties, and characteristics of covalent and ionic bonds.

Accepted Answer

Both covalent and ionic bonds result in

Question 17

Explain how the number of valence electrons is related to the chemical properties of an atom.Use two specific examples in your explanation.

Accepted Answer

Atoms having filled valence sh

Question 18

Specific heat refers to the amount of energy required to change 1 gram of a substance from the liquid phase to the vapor phase.
__________________

Accepted Answer

A) True 
 B)False

Question 19

An atom becomes a cation if:

Accepted Answer

A)  it gains one or more electron. 
B)  it loses one or more electron. 
C)  it shares electrons. 
D)  one or more of its electrons changes energy levels. 
E)  it emits radiation. 
A)  it gains one or more electron. 
B)  it loses one or more electron. 
C)  it shares electrons. 
D)  one or more of its electrons changes energy levels. 
E)  it emits radiation.

Question 20

A covalent bond:

Accepted Answer

A)  forms only between identical atoms. 
B)  involves a sharing of only one pair of electrons. 
C)  is always polar. 
D)  may be polar or nonpolar depending on the atoms involved. 
E)  always forms between identical molecules. 
A)  forms only between identical atoms. 
B)  involves a sharing of only one pair of electrons. 
C)  is always polar. 
D)  may be polar or nonpolar depending on the atoms involved. 
E)  always forms between identical molecules.

Exam 2: Atoms and Molecules: the Chemical Basis of Life

Figure 2-2 Use the figure below to answer the corresponding question(s). -Figure 2-2 represents:

When atoms react to form an ionic bond, electrons are shared between those atoms. __________________

A solution having a pH of 8 is slightly acidic. __________________

Figure 2-1 Use the figure below to answer the corresponding question(s). -Figure 2-1 represents:

When a chemical reaction is at equilibrium:

The particular type of element is determined by the number of:

Match the term with its description: a.adhesion c.surface tension b.cohesion d.capillary action -Responsible for the ability of water molecules to move in the microscopic spaces between soil particles

Identify the chemical(s) that act(s) as a buffer in human blood:

Radioisotopes are used in all of the following scientific applications except:

The tetrahedron shape of a methane molecule is the result of orbital hybridization. __________________

MATCHING Match the type of bond or interaction with its description. a.hydrogen bond c.ionic bond b.van de Waals interaction d.covalent bond -Strong attractive force resulting from the sharing of electrons between atoms

Figure 2-1 Use the figure below to answer the corresponding question(s). -Isotopes differ from each other with respect to the number of:

List the four elements that account for over 90% of the mass of living organisms and identify an important biological function of each element.

Match the term with its description: a.adhesion c.surface tension b.cohesion d.capillary action -Sticking together of unlike molecules

The difference between a stable isotope and a radioisotope is that:

Compare and contrast the formation, properties, and characteristics of covalent and ionic bonds.

Explain how the number of valence electrons is related to the chemical properties of an atom.Use two specific examples in your explanation.

Specific heat refers to the amount of energy required to change 1 gram of a substance from the liquid phase to the vapor phase. __________________

An atom becomes a cation if:

A covalent bond:

A View of Life

The Chemistry of Life: Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp: Energy-Releasing Pathways

Photosynthesis: Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna: the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity: Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure, Growth, and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function: an Introduction

Protection, Support, and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System: Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology: Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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