Question 1

A hydrogen bond is a(n)

Accepted Answer

A)  sharing of a pair of electrons between a hydrogen and an oxygen nucleus. 
B)  sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus. 
C)  attractive force between a hydrogen atom and either an oxygen or a nitrogen atom that are in other molecules or within the same molecule. 
D)  covalent bond between two hydrogen atoms. 
E)  covalent bond between a hydrogen atom and either an oxygen atom or a nitrogen atom. 
A)  sharing of a pair of electrons between a hydrogen and an oxygen nucleus. 
B)  sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus. 
C)  attractive force between a hydrogen atom and either an oxygen or a nitrogen atom that are in other molecules or within the same molecule. 
D)  covalent bond between two hydrogen atoms. 
E)  covalent bond between a hydrogen atom and either an oxygen atom or a nitrogen atom.

Question 2

In the chemical shorthand 14C, the 14 represents the number of

Accepted Answer

A)  excess neutrons. 
B)  protons plus neutrons. 
C)  electrons. 
D)  protons plus electrons. 
E)  radioactive particles. 
A)  excess neutrons. 
B)  protons plus neutrons. 
C)  electrons. 
D)  protons plus electrons. 
E)  radioactive particles.

Question 3

The nucleus of an atom contains

Accepted Answer

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

Question 4

-Which of the following statements is NOT true?

Accepted Answer

A)  All isotopes of an element have the same number of electrons. 
B)  All isotopes of an element have the same number of protons. 
C)  All isotopes of an element have the same number of neutrons. 
D)  We refer to isotopes by mass number. 
E)  12C and 13C are isotopes. 
A)  All isotopes of an element have the same number of electrons. 
B)  All isotopes of an element have the same number of protons. 
C)  All isotopes of an element have the same number of neutrons. 
D)  We refer to isotopes by mass number. 
E)  12C and 13C are isotopes.

Question 5

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type.
a.hydrogen
b.ionic
c.covalent
d.polar covalent
e.double bond
-Water surface tension is caused by __________ bonds.

Accepted Answer

The answer of Classification.The following are types of chemical bonds.Answer...

Question 6

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type.
a.hydrogen
b.ionic
c.covalent
d.polar covalent
e.double bond
-a bond in which connected atoms share electrons

Accepted Answer

The answer of Classification.The following are types of chemical bonds.Answer...

Question 7

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type.
a.hydrogen
b.ionic
c.covalent
d.polar covalent
e.double bond
-the bond type holding several molecules of water together

Accepted Answer

The answer of Classification.The following are types of chemical bonds.Answer...

Question 8

MATCHING
Classification.The various energy levels in an atom of magnesium (   
) have different numbers of electrons.Use the numbers below to answer the following questions.
a.1
b.2
c.3
d.6
e.8
-number of electrons in the second energy level

Accepted Answer

The answer of MATCHING
Classification.The various energy levels in an atom...

Question 9

How much mercury can the average human safely consume per day?

Accepted Answer

A)  1 microgram. 
B)  3 micrograms. 
C)  7 micrograms. 
D)  10 micrograms. 
E)  100 micrograms. 
A)  1 microgram. 
B)  3 micrograms. 
C)  7 micrograms. 
D)  10 micrograms. 
E)  100 micrograms.

Question 10

Isotopes of atoms

Accepted Answer

A)  are electrically unbalanced. 
B)  behave the same chemically and physically but differ biologically from other isotopes. 
C)  are the same physically and biologically but differ from other isotopes chemically. 
D)  have the same number of protons but a different number of neutrons. 
E)  are produced when atoms lose electrons. 
A)  are electrically unbalanced. 
B)  behave the same chemically and physically but differ biologically from other isotopes. 
C)  are the same physically and biologically but differ from other isotopes chemically. 
D)  have the same number of protons but a different number of neutrons. 
E)  are produced when atoms lose electrons.

Question 11

The atomic mass (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.

Question 12

A solution with a pH of 9 has how many times fewer hydrogen ions than a solution with a pH of 6?

Accepted Answer

A)  2 
B)  4 
C)  10 
D)  100 
E)  1,000 
A)  2 
B)  4 
C)  10 
D)  100 
E)  1,000

Question 13

Nitrogen, with an atomic number of 7, has ____ electrons in the first energy level and ____ electrons in the second energy level.

Accepted Answer

A)  1; 6 
B)  2; 5 
C)  3; 4 
D)  4; 3 
E)  5; 2 
A)  1; 6 
B)  2; 5 
C)  3; 4 
D)  4; 3 
E)  5; 2

Question 14

Which is NOT an element?

Accepted Answer

A)  water 
B)  oxygen 
C)  carbon 
D)  chlorine 
E)  hydrogen 
A)  water 
B)  oxygen 
C)  carbon 
D)  chlorine 
E)  hydrogen

Question 15

-The dots in the figure represent a(n)

Accepted Answer

A)  covalent bond. 
B)  ionic bond. 
C)  hydrogen bond. 
D)  polar covalent bond. 
E)  hydrophobic interaction. 
A)  covalent bond. 
B)  ionic bond. 
C)  hydrogen bond. 
D)  polar covalent bond. 
E)  hydrophobic interaction.

Question 16

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type.
a.hydrogen
b.ionic
c.covalent
d.polar covalent
e.double bond
-the bond that breaks when salts dissolve in water

Accepted Answer

The answer of Classification.The following are types of chemical bonds.Answer...

Question 17

"Acidic" is an appropriate description for all EXCEPT which one of the following?

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 18

Which statement concerning radioisotope 14C is false?

Accepted Answer

A)  It can be substituted for 12C in glucose and the body will still be able to use the compound. 
B)  It has a different number of protons than 12C. 
C)  It has more neutrons than 12C. 
D)  It behaves the same chemically as 12C. 
E)  It has six carbons and eight neutrons. 
A)  It can be substituted for 12C in glucose and the body will still be able to use the compound. 
B)  It has a different number of protons than 12C. 
C)  It has more neutrons than 12C. 
D)  It behaves the same chemically as 12C. 
E)  It has six carbons and eight neutrons.

Question 19

Sodium chloride (KCl) in water can be described by any EXCEPT which of the following?

Accepted Answer

A)  K+ and Cl-form 
B)  a solute 
C)  ionized 
D)  forms hydrophobic interactions 
E)  dissolved 
A)  K+ and Cl-form 
B)  a solute 
C)  ionized 
D)  forms hydrophobic interactions 
E)  dissolved

Question 20

The column of water extending in tubes from plant roots to leaves is maintained by

Accepted Answer

A)  cohesion among water molecules. 
B)  ionic bonds. 
C)  covalent bonds. 
D)  hydrophobic interactions. 
E)  hydrophilic interactions. 
A)  cohesion among water molecules. 
B)  ionic bonds. 
C)  covalent bonds. 
D)  hydrophobic interactions. 
E)  hydrophilic interactions.

Exam 2: Lifes Chemical Basis

A hydrogen bond is a(n)

In the chemical shorthand 14C, the 14 represents the number of

The nucleus of an atom contains

-Which of the following statements is NOT true?

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type. a.hydrogen b.ionic c.covalent d.polar covalent e.double bond -Water surface tension is caused by __________ bonds.

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type. a.hydrogen b.ionic c.covalent d.polar covalent e.double bond -a bond in which connected atoms share electrons

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type. a.hydrogen b.ionic c.covalent d.polar covalent e.double bond -the bond type holding several molecules of water together

MATCHING Classification.The various energy levels in an atom of magnesium ( ) have different numbers of electrons.Use the numbers below to answer the following questions. a.1 b.2 c.3 d.6 e.8 -number of electrons in the second energy level

How much mercury can the average human safely consume per day?

Isotopes of atoms

The atomic mass (mass number) of an atom is determined by the combined masses of its

A solution with a pH of 9 has how many times fewer hydrogen ions than a solution with a pH of 6?

Nitrogen, with an atomic number of 7, has ____ electrons in the first energy level and ____ electrons in the second energy level.

Which is NOT an element?

-The dots in the figure represent a(n)

Classification.The following are types of chemical bonds.Answer the questions below by matching the descriptions with the most appropriate bond type. a.hydrogen b.ionic c.covalent d.polar covalent e.double bond -the bond that breaks when salts dissolve in water

"Acidic" is an appropriate description for all EXCEPT which one of the following?

Which statement concerning radioisotope 14C is false?

Sodium chloride (KCl) in water can be described by any EXCEPT which of the following?

The column of water extending in tubes from plant roots to leaves is maintained by

Invitation to Biology

Molecules of Life

Cell Structure and Function

Ground Rules of Metabolism

Where It Startsphotosynthesis

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

Organizing Information About Species

Lifes Origin and Early Evolution

Viruses and Prokaryotes

Protiststhe Simplest Eukaryotes

The Land Plants

Fungi

Animal Evolutionthe Invertebrates

Animal Evolutionthe Chordates

Animal Evolutionhuman Evolution

Plant Tissues

Plant Nutrition and Transport

Life Cycles of Flowering Plants

Communication Strategies in Plants

Animal Tissues and Organ Systems

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

Population Ecology

Community Ecology

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters

In the chemical shorthand ¹⁴C, the 14 represents the number of

Nitrogen, with an atomic number of 7, has electrons in the first energy level and electrons in the second energy level.

Which statement concerning radioisotope ¹⁴C is false?