Question 1

Which statement is an accurate description of water molecules?

Accepted Answer

A) They are ionically bonded. 
B) They are charged and nonpolar. 
C) They are slightly charged and polar. 
D) They are uncharged and nonpolar. 
A) They are ionically bonded. 
B) They are charged and nonpolar. 
C) They are slightly charged and polar. 
D) They are uncharged and nonpolar.

Question 2

Free radicals are considered dangerous because they:

Accepted Answer

A) attack the atomic nucleus. 
B) emit dangerous radiation. 
C) steal electrons from other atoms, causing them to become free radicals. 
D) damage oxygen and cause it to become an antioxidant. 
A) attack the atomic nucleus. 
B) emit dangerous radiation. 
C) steal electrons from other atoms, causing them to become free radicals. 
D) damage oxygen and cause it to become an antioxidant.

Question 3

You drop a handful of salt into a glass of water. Which of the following BEST describes what is happening inside the glass at the molecular level?

Accepted Answer

A) The positively charged hydrogen ends of the water molecules are attracted to sodium ions. 
B) The positively charged hydrogen ends of the water molecules are attracted to chloride ions. 
C) Sodium and chloride ions form a covalent bond. 
D) Water and sodium form a covalent bond. 
A) The positively charged hydrogen ends of the water molecules are attracted to sodium ions. 
B) The positively charged hydrogen ends of the water molecules are attracted to chloride ions. 
C) Sodium and chloride ions form a covalent bond. 
D) Water and sodium form a covalent bond.

Question 4

If you place a feather on the surface of a bowl of water, the feather remains suspended on the surface due to the:

Accepted Answer

A) surface tension of the water. 
B) fact that water is a good solvent. 
C) polarity of the water. 
D) density of the water. 
A) surface tension of the water. 
B) fact that water is a good solvent. 
C) polarity of the water. 
D) density of the water.

Question 5

The formation of ions involves the:

Accepted Answer

A) sharing of electrons. 
B) gain or loss of electrons. 
C) gain or loss of protons. 
D) sharing of protons. 
E) gain or loss of neutrons. 
A) sharing of electrons. 
B) gain or loss of electrons. 
C) gain or loss of protons. 
D) sharing of protons. 
E) gain or loss of neutrons.

Question 6

The element carbon has atomic number 6. Carbon most likely:

Accepted Answer

A) forms an ionic bond. 
B) forms four covalent bonds. 
C) forms two covalent bonds. 
D) donates two electrons to another atom. 
A) forms an ionic bond. 
B) forms four covalent bonds. 
C) forms two covalent bonds. 
D) donates two electrons to another atom.

Question 7

Which of the following results from an unequal sharing of electrons between atoms?

Accepted Answer

A) nonpolar covalent bond 
B) polar covalent bond 
C) ionic bond 
D) hydrogen bond 
E) electronproton interaction 
A) nonpolar covalent bond 
B) polar covalent bond 
C) ionic bond 
D) hydrogen bond 
E) electronproton interaction

Question 8

Which of the following BEST explains why a particular atom may not form compounds readily?

Accepted Answer

A) The atom has no electrons. 
B) The atom has an uneven number of protons. 
C) The atom has seven electrons in its outer shell. 
D) The atom's outer energy shells are completely full. 
A) The atom has no electrons. 
B) The atom has an uneven number of protons. 
C) The atom has seven electrons in its outer shell. 
D) The atom's outer energy shells are completely full.

Question 9

What is meant by the statement that water has a high specific heat?

Accepted Answer

A) It can absorb a lot of energy without changing temperature. 
B) It grows hot very quickly. 
C) The boiling point of water is very low. 
D) Water can heat up to only a certain temperature. 
E) Water freezes easily. 
A) It can absorb a lot of energy without changing temperature. 
B) It grows hot very quickly. 
C) The boiling point of water is very low. 
D) Water can heat up to only a certain temperature. 
E) Water freezes easily.

Question 10

Molecules that are electrically attracted to water molecules are ________.

Accepted Answer

The answer of Molecules that are electrically attracted to water...

Question 11

If you examined the human body, which of the following combinations of elements would be most common?

Accepted Answer

A) C, O, P, S 
B) C, Na, O, N 
C) Cl, Ca, C, H 
D) C, S, Ca, N 
E) O, N, H, C 
A) C, O, P, S 
B) C, Na, O, N 
C) Cl, Ca, C, H 
D) C, S, Ca, N 
E) O, N, H, C

Question 12

All snowflakes have six sides because of the hexagonal crystal array of frozen water molecules. True or False?

Accepted Answer

A) True 
 B)False

Question 13

Isotopes are atoms of the same element that have different numbers of protons. True or False?

Accepted Answer

A) True 
 B)False

Question 14

As ice melts, it:

Accepted Answer

A) absorbs heat from its surroundings. 
B) becomes less dense. 
C) increases its property of cohesion. 
D) increases its heat of vaporization. 
A) absorbs heat from its surroundings. 
B) becomes less dense. 
C) increases its property of cohesion. 
D) increases its heat of vaporization.

Question 15

A neutral solution:

Accepted Answer

A) has no H+. 
B) has no OH- . 
C) has equal amounts of H+ and OH- . 
D) is hydrophobic. 
E) has a pH of 0. 
A) has no H+. 
B) has no OH- . 
C) has equal amounts of H+ and OH- . 
D) is hydrophobic. 
E) has a pH of 0.

Question 16

How does a base differ from an acid?

Accepted Answer

A base is a solution with a co

Question 17

Different types of living matter often have different forms of the same elements in their bodies. For example, the nitrogen in an animal often has a slightly different atomic structure than the nitrogen in a plant. Recently, nutritionists have discovered how to deduce the diets of various animal species by examining the type of nitrogen (and other elements)inside their bodies. What is the chemical basis behind this scenario?

Accepted Answer

A) Antioxidants buffer the potential damage that free radicals do to cells. 
B) Radioactive elements can be used to trace the paths of molecules through the body. 
C) Hydrophobic interactions keep water molecules from forming bonds with fats and oils. 
D) Isotopes have the same atomic number but different atomic masses. 
E) Covalent bonds result when two atoms share electrons. 
A) Antioxidants buffer the potential damage that free radicals do to cells. 
B) Radioactive elements can be used to trace the paths of molecules through the body. 
C) Hydrophobic interactions keep water molecules from forming bonds with fats and oils. 
D) Isotopes have the same atomic number but different atomic masses. 
E) Covalent bonds result when two atoms share electrons.

Question 18

For an atom to achieve maximum stability and become chemically inert, what must occur?

Accepted Answer

A) Its outermost energy shell must be filled with electrons. 
B) The number of electrons must equal the number of protons. 
C) Electron pairs are shared. 
D) Ionization occurs. 
A) Its outermost energy shell must be filled with electrons. 
B) The number of electrons must equal the number of protons. 
C) Electron pairs are shared. 
D) Ionization occurs.

Question 19

A single covalent chemical bond represents the sharing of how many electrons?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 6 
A) 1 
B) 2 
C) 3 
D) 4 
E) 6

Question 20

What type of bond is easily disrupted in aqueous solutions?

Accepted Answer

A) covalent 
B) polar covalent 
C) ionic 
A) covalent 
B) polar covalent 
C) ionic

Exam 2: Atoms, Molecules, and Life

Which statement is an accurate description of water molecules?

Free radicals are considered dangerous because they:

You drop a handful of salt into a glass of water. Which of the following BEST describes what is happening inside the glass at the molecular level?

If you place a feather on the surface of a bowl of water, the feather remains suspended on the surface due to the:

The formation of ions involves the:

The element carbon has atomic number 6. Carbon most likely:

Which of the following results from an unequal sharing of electrons between atoms?

Which of the following BEST explains why a particular atom may not form compounds readily?

What is meant by the statement that water has a high specific heat?

Molecules that are electrically attracted to water molecules are ________.

If you examined the human body, which of the following combinations of elements would be most common?

All snowflakes have six sides because of the hexagonal crystal array of frozen water molecules. True or False?

Isotopes are atoms of the same element that have different numbers of protons. True or False?

As ice melts, it:

A neutral solution:

How does a base differ from an acid?

For an atom to achieve maximum stability and become chemically inert, what must occur?

A single covalent chemical bond represents the sharing of how many electrons?

What type of bond is easily disrupted in aqueous solutions?

An Introduction to Life on Earth

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

The Continuity of Life: Cellular Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amidst Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

How Do Ecosystems Work

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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