Question 1

Which of the following is the densest?

Accepted Answer

A)  Liquid water 
B)  Ice 
C)  Steam 
A)  Liquid water 
B)  Ice 
C)  Steam

Question 2

Imagine that you are trying to make a homemade salad dressing and place several drops of olive oil into a container of water. You stir the solution, but the oil doesnʹt readily mix. Instead, you observe a glistening clump of oil floating on the surface. Explain what is happening at the molecular level. (Your answer should include the term hydrophobic.)

Accepted Answer

When oil molecules are together in water

Question 3

Atoms or molecules that have gained or lost electrons are called

Accepted Answer

A)  bases. 
B)  ions. 
C)  buffers. 
D)  covalent. 
E)  acids. 
A)  bases. 
B)  ions. 
C)  buffers. 
D)  covalent. 
E)  acids.

Question 4

Which of the following is attracted to the hydrogen ?end? of a water molecule, as depicted in this figure?

Accepted Answer

A)  NaCl 
B)  Na+ 
C)  H 
D)  Cl- 
A)  NaCl 
B)  Na+ 
C)  H 
D)  Cl-

Question 5

Acids have pH values below 7, whereas bases have pH values above 7.

Accepted Answer

A) True 
 B)False

Question 6

Most liquids become less dense upon solidification, but water is different in that it becomes denser when it solidifies.

Accepted Answer

A) True 
 B)False

Question 7

The attractive force that holds two or more water molecules together is an example of an ionic bond.

Accepted Answer

A) True 
 B)False

Question 8

What type of bonding exists between the slight positive charge of a hydrogen atom and the slight negative charge of a nearby oxygen atom?

Accepted Answer

The answer of What type of bonding exists between the...

Question 9

A basilisk lizard can run across the surface of a pond due to a property of water called_________.

Accepted Answer

The answer of A basilisk lizard can run across the...

Question 10

Sweating is a useful cooling mechanism for humans because water

Accepted Answer

A)  takes up a great deal of heat in changing from its liquid state to its gaseous state. 
B)  takes up a great deal of heat in changing from its solid state to its liquid state. 
C)  can exist in two states at temperatures common on Earth. 
D)  ionizes readily. 
E)  is an outstanding solvent. 
A)  takes up a great deal of heat in changing from its liquid state to its gaseous state. 
B)  takes up a great deal of heat in changing from its solid state to its liquid state. 
C)  can exist in two states at temperatures common on Earth. 
D)  ionizes readily. 
E)  is an outstanding solvent.

Question 11

Carbon has atomic number 6. Carbon most likely

Accepted Answer

A)  loses protons. 
B)  shares electrons. 
C)  shares neutrons. 
D)  shares protons. 
E)  loses electrons. 
A)  loses protons. 
B)  shares electrons. 
C)  shares neutrons. 
D)  shares protons. 
E)  loses electrons.

Question 12

Free radicals are considered dangerous because they

Accepted Answer

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

Question 13

If you place a paper towel in a dish of water, the water will

Accepted Answer

A)  separate into H+ and OH- ions, which will react with the paper towel molecules. 
B)  move away from the towel because water molecules have hydrophobic interactions. 
C)  dissolve the towel because water is a good solvent. 
D)  move up the towel as the water adheres to the paper towel while the cohesive water molecules stay bound to each other. 
E)  move up the towel because water molecules move quickly as it vaporizes. 
A)  separate into H+ and OH- ions, which will react with the paper towel molecules. 
B)  move away from the towel because water molecules have hydrophobic interactions. 
C)  dissolve the towel because water is a good solvent. 
D)  move up the towel as the water adheres to the paper towel while the cohesive water molecules stay bound to each other. 
E)  move up the towel because water molecules move quickly as it vaporizes.

Question 14

What happens when hydrochloric acid (HCl) dissociates in pure water?

Accepted Answer

A)  The water has a decrease of H+ ions. 
B)  The HCl molecules float on top of the water. 
C)  The HCl molecules separate into H+ and Cl- ions. 
D)  The concentration of OH- ions increases. 
E)  The pH of the solution increases. 
A)  The water has a decrease of H+ ions. 
B)  The HCl molecules float on top of the water. 
C)  The HCl molecules separate into H+ and Cl- ions. 
D)  The concentration of OH- ions increases. 
E)  The pH of the solution increases.

Question 15

Isotopes are atoms of the same element that have different numbers of protons.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

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

Question 17

Which four elements make up approximately 96% of living matter?

Accepted Answer

A)  Carbon, phosphorus, hydrogen, sulfur 
B)  Carbon, oxygen, calcium, sulfur 
C)  Carbon, sodium, chlorine, magnesium 
D)  Oxygen, hydrogen, calcium, sodium 
E)  Carbon, hydrogen, nitrogen, oxygen 
A)  Carbon, phosphorus, hydrogen, sulfur 
B)  Carbon, oxygen, calcium, sulfur 
C)  Carbon, sodium, chlorine, magnesium 
D)  Oxygen, hydrogen, calcium, sodium 
E)  Carbon, hydrogen, nitrogen, oxygen

Question 18

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

Accepted Answer

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

Question 19

more stable than a hydrogen atom (atomic number 1)?

Accepted Answer

Two electrons completely fill

Question 20

Radioactive isotopes are biological tools that are often used to

Accepted Answer

A)  measure the size of fossils. 
B)  detect brain tumors and other important medical technologies. 
C)  increase the pH of blood. 
D)  build up a store of calcium in a cell. 
A)  measure the size of fossils. 
B)  detect brain tumors and other important medical technologies. 
C)  increase the pH of blood. 
D)  build up a store of calcium in a cell.

Exam 2: Atoms, Molecules, and Life

Which of the following is the densest?

Atoms or molecules that have gained or lost electrons are called

Which of the following is attracted to the hydrogen ?end? of a water molecule, as depicted in this figure?

Acids have pH values below 7, whereas bases have pH values above 7.

Most liquids become less dense upon solidification, but water is different in that it becomes denser when it solidifies.

The attractive force that holds two or more water molecules together is an example of an ionic bond.

What type of bonding exists between the slight positive charge of a hydrogen atom and the slight negative charge of a nearby oxygen atom?

A basilisk lizard can run across the surface of a pond due to a property of water called_________.

Sweating is a useful cooling mechanism for humans because water

Carbon has atomic number 6. Carbon most likely

Free radicals are considered dangerous because they

If you place a paper towel in a dish of water, the water will

What happens when hydrochloric acid (HCl) dissociates in pure water?

Isotopes are atoms of the same element that have different numbers of protons.

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

Which four elements make up approximately 96% of living matter?

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

more stable than a hydrogen atom (atomic number 1)?

Radioactive isotopes are biological tools that are often used to

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

Cellular Reproduction

Meiosis: the Basis of Sexual 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 Amid 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

Energy Flow and Nutrient Cycling in Ecosystems

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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