Question 1

What is the primary reason for the occurrence of mercury in the human body?

Accepted Answer

A)  ​It is biologically inactive and dormant. 
B)  ​It provides vital biological functions in trace amounts. 
C)  ​It is needed to kill bacteria. 
D)  ​It is a byproduct of cellular function. 
E)  ​It is consumed through seafood. 
A)  ​It is biologically inactive and dormant. 
B)  ​It provides vital biological functions in trace amounts. 
C)  ​It is needed to kill bacteria. 
D)  ​It is a byproduct of cellular function. 
E)  ​It is consumed through seafood. E

Question 2

The mass number of an atom is determined by the combined masses of its ____.

Accepted Answer

A)  neutrons and protons 
B)  neutrons and electrons 
C)  protons and electrons 
D)  protons, neutrons, and electrons 
E)  neutrons, nucleus, and electrons 
A)  neutrons and protons 
B)  neutrons and electrons 
C)  protons and electrons 
D)  protons, neutrons, and electrons 
E)  neutrons, nucleus, and electrons A

Question 3

The ____ of an atom have a negative charge.

Accepted Answer

A)  ​nuclei 
B)  ​protons 
C)  ​neutrons 
D)  ​ions 
E)  ​electrons 
A)  ​nuclei 
B)  ​protons 
C)  ​neutrons 
D)  ​ions 
E)  ​electrons E

Question 4

The various energy levels in an atom of magnesium (S1U1P124S1S1P0Mg) have different numbers of electrons. Use the numbers below to answer the following question.
-The number of electrons in the second energy level

Accepted Answer

A) ​1 
B) ​2 
C) ​3 
D) ​6 
E) ​8 
A) ​1 
B) ​2 
C) ​3 
D) ​6 
E) ​8

Question 5

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type
-The bond type holding several molecules of water together​

Accepted Answer

A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond 
A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond

Question 6

The following are important terms relating to acids and bases. Answer the question below by matching the description with the most appropriate word.​
-Toothpaste

Accepted Answer

A) ​pH 
B) ​acid 
C) ​base 
D) ​buffer 
A) ​pH 
B) ​acid 
C) ​base 
D) ​buffer

Question 7

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type
-The bond between the atoms of table salt (NaCl)

Accepted Answer

A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond 
A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond

Question 8

Isotopes of an element are differentiated by their ____.

Accepted Answer

A)  ​atomic weight 
B)  ​number of orbital shells 
C)  ​element name 
D)  ​mass number 
E)  ​electron profile 
A)  ​atomic weight 
B)  ​number of orbital shells 
C)  ​element name 
D)  ​mass number 
E)  ​electron profile

Question 9

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​
-A dissolved substance

Accepted Answer

A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent 
A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent

Question 10

A solution with a pH of 9 has ____ times fewer hydrogen ions than a solution with a pH of 6.

Accepted Answer

A)  two​ 
B)  ​four 
C)  ​10 
D)  ​100 
E)  ​1,000 
A)  two​ 
B)  ​four 
C)  ​10 
D)  ​100 
E)  ​1,000

Question 11

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​
-A compound that releases ions when dissolved in water

Accepted Answer

A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent 
A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent

Question 12

All isotopes of an element have a different number of ____.

Accepted Answer

A)  ​electrons 
B)  ​protons 
C)  ​neutrons 
D)  ​orbital shells 
E)  ​atoms 
A)  ​electrons 
B)  ​protons 
C)  ​neutrons 
D)  ​orbital shells 
E)  ​atoms

Question 13

The various energy levels in an atom of magnesium (S1U1P124S1S1P0Mg) have different numbers of electrons. Use the numbers below to answer the following question.
-The number of electrons in the first energy level

Accepted Answer

A) ​1 
B) ​2 
C) ​3 
D) ​6 
E) ​8 
A) ​1 
B) ​2 
C) ​3 
D) ​6 
E) ​8

Question 14

The bond in table salt (NaCl) is ____.

Accepted Answer

A)  ​polar 
B)  ​ionic 
C)  ​covalent 
D)  ​double 
E)  ​nonpolar 
A)  ​polar 
B)  ​ionic 
C)  ​covalent 
D)  ​double 
E)  ​nonpolar

Question 15

"Acidic" is an appropriate description for four of the following. Which one is the exception?

Accepted Answer

A)  ​excess hydrogen ions 
B)  ​the contents of the stomach 
C)  ​magnesium hydroxide 
D)  ​HCl 
E)  ​a pH less than 7 
A)  ​excess hydrogen ions 
B)  ​the contents of the stomach 
C)  ​magnesium hydroxide 
D)  ​HCl 
E)  ​a pH less than 7

Question 16

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type
-A bond in which connected atoms unequally share electrons

Accepted Answer

A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond 
A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond

Question 17

In ____ bonds, both atoms exert the same pull on shared electrons.

Accepted Answer

A)  ​triple covalent 
B)  ​polar covalent 
C)  ​double covalent 
D)  ​nonpolar covalent 
E)  ​coordinate covalent 
A)  ​triple covalent 
B)  ​polar covalent 
C)  ​double covalent 
D)  ​nonpolar covalent 
E)  ​coordinate covalent

Question 18

A hydrogen bond is an attraction between a(n) ____ hydrogen atom and another hydrogen atom taking part in ____.

Accepted Answer

A)  ​covalently bonded; the same polar covalent bond 
B)  ​ionically bonded; the same polar covalent bond 
C)  ​covalently bonded; a separate polar covalent bond 
D)  ​ionically bonded; a separate nonpolar covalent bond 
E)  ​nonpolar covalently bonded; a separate nonpolar covalent bond 
A)  ​covalently bonded; the same polar covalent bond 
B)  ​ionically bonded; the same polar covalent bond 
C)  ​covalently bonded; a separate polar covalent bond 
D)  ​ionically bonded; a separate nonpolar covalent bond 
E)  ​nonpolar covalently bonded; a separate nonpolar covalent bond

Question 19

When exposed to water, sodium chloride (NaCl) ____.

Accepted Answer

A)  ​dissolves into Na+ and Cl- ions 
B)  ​crystallizes into a solid 
C)  ​dissolves into Na- and Cl+ ions 
D)  ​crystallizes into a liquid 
E)  ​forms a hydrophobic compound 
A)  ​dissolves into Na+ and Cl- ions 
B)  ​crystallizes into a solid 
C)  ​dissolves into Na- and Cl+ ions 
D)  ​crystallizes into a liquid 
E)  ​forms a hydrophobic compound

Question 20

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type
-The bond between the oxygen atoms of oxygen gas (O₂)​

Accepted Answer

A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond 
A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond

Exam 2: Lifes Chemical Basis

What is the primary reason for the occurrence of mercury in the human body?

The mass number of an atom is determined by the combined masses of its ____.

The ____ of an atom have a negative charge.

The various energy levels in an atom of magnesium (24Mg) have different numbers of electrons. Use the numbers below to answer the following question. -The number of electrons in the second energy level

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -The bond type holding several molecules of water together​

The following are important terms relating to acids and bases. Answer the question below by matching the description with the most appropriate word.​ -Toothpaste

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -The bond between the atoms of table salt (NaCl)

Isotopes of an element are differentiated by their ____.

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​ -A dissolved substance

A solution with a pH of 9 has ____ times fewer hydrogen ions than a solution with a pH of 6.

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​ -A compound that releases ions when dissolved in water

All isotopes of an element have a different number of ____.

The various energy levels in an atom of magnesium (24Mg) have different numbers of electrons. Use the numbers below to answer the following question. -The number of electrons in the first energy level

The bond in table salt (NaCl) is ____.

"Acidic" is an appropriate description for four of the following. Which one is the exception?

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -A bond in which connected atoms unequally share electrons

In ____ bonds, both atoms exert the same pull on shared electrons.

A hydrogen bond is an attraction between a(n) ____ hydrogen atom and another hydrogen atom taking part in ____.

When exposed to water, sodium chloride (NaCl) ____.

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -The bond between the oxygen atoms of oxygen gas (O₂)​

Invitation to Biology

Molecules of Life

Cell Structure and Function

Ground Rules of Metabolism

Where It Starts - Photosynthesis

How Cells Release Chemical Energy

Dna Structure and Function

From Dna to Protein

Gene Control

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Studying and Manipulating Genomes

Evidence of Evolution

Processes of Evolution

Organizating Information About Species

Lifes Origin and Early Evolution

Viruses - Bacteria - and Archaea

Protists - the Simplest Eukaryotes

The Land Plants

Fungi

Animal Evolution - the Invertibrates

Animal Evolution - the Chordates

Human Evolution

Plant Tissues

Plant Nutrition and Transport

Life Cycles of Flowering Plants

Communication Strategies in Plants

Animal Tissues

Neural Control

Sensory Perception

Endocrine Control

Structural Support and Movement

Circulation

Immunity

Respiration

Digestion and Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Filters

The various energy levels in an atom of magnesium (²⁴Mg) have different numbers of electrons. Use the numbers below to answer the following question. -The number of electrons in the second energy level

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -The bond type holding several molecules of water together

The following are important terms relating to acids and bases. Answer the question below by matching the description with the most appropriate word. -Toothpaste

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word. -A dissolved substance

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word. -A compound that releases ions when dissolved in water

The various energy levels in an atom of magnesium (²⁴Mg) have different numbers of electrons. Use the numbers below to answer the following question. -The number of electrons in the first energy level

A hydrogen bond is an attraction between a(n) hydrogen atom and another hydrogen atom taking part in .

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -The bond between the oxygen atoms of oxygen gas (O₂)