Question 1

Which of the following models represents an atom that is most likely to form a cation with a charge of +1?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 2

A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have the greatest difficulty clinging to a ________.

Accepted Answer

A)  slightly damp surface 
B)  surface of hydrocarbons 
C)  surface of mostly carbon-oxygen bonds 
D)  surface of mostly carbon-nitrogen bonds 
A)  slightly damp surface 
B)  surface of hydrocarbons 
C)  surface of mostly carbon-oxygen bonds 
D)  surface of mostly carbon-nitrogen bonds

Question 3

How many electrons are present in the neutral atom represented in the Periodic Table block in the figure?

Accepted Answer

A)  18 
B)  19 
C)  22 
D)  40 
A)  18 
B)  19 
C)  22 
D)  40

Question 4

An ion that consists of 7 protons, 6 neutrons, and 11 electrons has a net charge of ________.

Accepted Answer

A)  4- 
B)  5+ 
C)  5- 
D)  4+ 
A)  4- 
B)  5+ 
C)  5- 
D)  4+

Question 5

Which of the following best explain why argon, which is a noble gas, does not react with other elements. Noble gases ________.

Accepted Answer

A)  have completely paired up and stable electron shells 
B)  have very small atoms 
C)  are not found in abundance on our planet 
D)  have a high positive charge that repels most elements 
A)  have completely paired up and stable electron shells 
B)  have very small atoms 
C)  are not found in abundance on our planet 
D)  have a high positive charge that repels most elements

Question 6

Which of the following correctly describes chemical equilibrium?

Accepted Answer

A)  Forward and reverse reactions continue with no net effect on the concentrations of the reactants and products. 
B)  Concentrations of products are higher than the concentrations of the reactants. 
C)  There are equal concentrations of products and reactants while forward and reverse reactions continue. 
D)  There are equal concentrations of reactants and products, and the reactions have stopped. 
A)  Forward and reverse reactions continue with no net effect on the concentrations of the reactants and products. 
B)  Concentrations of products are higher than the concentrations of the reactants. 
C)  There are equal concentrations of products and reactants while forward and reverse reactions continue. 
D)  There are equal concentrations of reactants and products, and the reactions have stopped.

Question 7

How many electrons are present in a Phosphorus 2+ atom?

Accepted Answer

A)  12 
B)  13 
C)  19 
D)  34 
A)  12 
B)  13 
C)  19 
D)  34

Question 8

A covalent bond is likely to be polar under which of the following conditions?

Accepted Answer

A)  one of the atoms sharing electrons is more electronegative than the other atom 
B)  the two atoms sharing electrons are equally electronegative 
C)  carbon is one of the two atoms sharing electrons 
D)  the two atoms sharing electrons are of the same elements 
A)  one of the atoms sharing electrons is more electronegative than the other atom 
B)  the two atoms sharing electrons are equally electronegative 
C)  carbon is one of the two atoms sharing electrons 
D)  the two atoms sharing electrons are of the same elements

Question 9

Which of the following factors will increase the rate of reaction in the forward direction?

Accepted Answer

A)  addition of nitrogen 
B)  addition of ammonia 
C)  addition of hydrogen 
D)  addition of both nitrogen and hydrogen 
A)  addition of nitrogen 
B)  addition of ammonia 
C)  addition of hydrogen 
D)  addition of both nitrogen and hydrogen

Question 10

Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Based on this information, which of the following is also true of molybdenum?

Accepted Answer

A)  Molybdenum atoms can have between 50 and 58 neutrons. 
B)  Molybdenum atoms can have between 50 and 58 protons. 
C)  Molybdenum atoms can have between 50 and 58 electrons. 
D)  Isotopes of molybdenum have different numbers of electrons. 
A)  Molybdenum atoms can have between 50 and 58 neutrons. 
B)  Molybdenum atoms can have between 50 and 58 protons. 
C)  Molybdenum atoms can have between 50 and 58 electrons. 
D)  Isotopes of molybdenum have different numbers of electrons.

Question 11

What is the atomic number of the cation formed in the reaction in the illustration?

Accepted Answer

A)  8 
B)  10 
C)  11 
D)  16 
A)  8 
B)  10 
C)  11 
D)  16

Question 12

Which of the following is true for the above reaction?

Accepted Answer

A)  the reaction is nonreversible 
B)  hydrogen and nitrogen are the reactants of the reverse reaction 
C)  ammonia is being formed and decomposed simultaneously 
D)  only the forward or reverse reactions can occur at one time 
A)  the reaction is nonreversible 
B)  hydrogen and nitrogen are the reactants of the reverse reaction 
C)  ammonia is being formed and decomposed simultaneously 
D)  only the forward or reverse reactions can occur at one time

Question 13

Which of the following models represents an atom that is most likely to form an anion with a charge of -1?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 14

Which one of the following describes the correct trends in electronegativity in the periodic table?

Accepted Answer

A)  increases across a period and decreases down a group 
B)  decreases across a period and decreases down a group 
C)  increases across a period and increases down a group 
D)  decreases across a period and increases down a group 
A)  increases across a period and decreases down a group 
B)  decreases across a period and decreases down a group 
C)  increases across a period and increases down a group 
D)  decreases across a period and increases down a group

Question 15

Which of the following are compounds?

Accepted Answer

A)  H2O, O2, and CH4 
B)  H2O and O2 
C)  O2 and CH4 
D)  H2O and CH4, but not O2 
A)  H2O, O2, and CH4 
B)  H2O and O2 
C)  O2 and CH4 
D)  H2O and CH4, but not O2

Question 16

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

Accepted Answer

A)  The concentrations of products and reactants are equal. 
B)  The reaction is now irreversible. 
C)  Both forward and reverse reactions have halted. 
D)  The rates of the forward and reverse reactions are equal. 
A)  The concentrations of products and reactants are equal. 
B)  The reaction is now irreversible. 
C)  Both forward and reverse reactions have halted. 
D)  The rates of the forward and reverse reactions are equal.

Question 17

How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 18

The reactivity of an atom arises from ________.

Accepted Answer

A)  the average distance of the outermost electron shell from the nucleus 
B)  the existence of unpaired electrons in the valence shell 
C)  the sum of the potential energies of all the electron shells 
D)  the potential energy of the valence shell 
A)  the average distance of the outermost electron shell from the nucleus 
B)  the existence of unpaired electrons in the valence shell 
C)  the sum of the potential energies of all the electron shells 
D)  the potential energy of the valence shell

Question 19

An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?

Accepted Answer

A)  single, double, or triple 
B)  single and double only 
C)  single bonds only 
D)  double bonds only 
A)  single, double, or triple 
B)  single and double only 
C)  single bonds only 
D)  double bonds only

Question 20

Oxygen has an atomic number of 8 and, most commonly, a mass number of 16. Thus, what is the atomic mass of an oxygen atom?

Accepted Answer

A)  approximately 8 grams 
B)  approximately 8 daltons 
C)  approximately 16 grams 
D)  approximately 16 daltons 
A)  approximately 8 grams 
B)  approximately 8 daltons 
C)  approximately 16 grams 
D)  approximately 16 daltons

Exam 2: Atoms and Molecules

Which of the following models represents an atom that is most likely to form a cation with a charge of +1?

A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a salamander would have the greatest difficulty clinging to a ________.

How many electrons are present in the neutral atom represented in the Periodic Table block in the figure?

An ion that consists of 7 protons, 6 neutrons, and 11 electrons has a net charge of ________.

Which of the following best explain why argon, which is a noble gas, does not react with other elements. Noble gases ________.

Which of the following correctly describes chemical equilibrium?

How many electrons are present in a Phosphorus 2+ atom?

A covalent bond is likely to be polar under which of the following conditions?

Which of the following factors will increase the rate of reaction in the forward direction?

Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Based on this information, which of the following is also true of molybdenum?

What is the atomic number of the cation formed in the reaction in the illustration?

Which of the following is true for the above reaction?

Which of the following models represents an atom that is most likely to form an anion with a charge of -1?

Which one of the following describes the correct trends in electronegativity in the periodic table?

Which of the following are compounds?

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4?

The reactivity of an atom arises from ________.

An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?

Oxygen has an atomic number of 8 and, most commonly, a mass number of 16. Thus, what is the atomic mass of an oxygen atom?

Biology and Its Themes

The Chemistry of Water

Carbon: the Basis of Molecular Diversity

Biological Macromolecules and Lipids

Energy and Life

Cell Structure and Function

Cell Membranes

Cellular Signaling

Cell Respiration

Photosynthetic Processes

Mitosis

Sexual Life Cycles and Meiosis

Mendelian Genetics

Linkage and Chromosomes

Nucleic Acids and Inheritance

Expression of Genes

Control of Gene Expression

Dna Technology

The Evolution of Genomes

How Evolution Works

Phylogenetic Reconstruction

Microevolution

Species and Speciation

Macroevolution

Introduction to Viruses

Prokaryotes

The Origin and Evolution of Eukaryotes

Nonvascular and Seedless Vascular Plants

Seed Plants

Introduction to Fungi

An Introduction to Animal Diversity

Invertebrates

Vertebrates

Plant Structure and Growth

Transport in Vascular Plants

Plant Nutrition

Reproduction of Flowering Plants

Plant Signals and Behavior

The Animal Body

Chemical Signals in Animals

Animal Digestive Systems

Animal Transport Systems

Animal Excretory Systems

Animal Reproductive Systems

Development in Animals

Animal Defenses Against Infection

Electrical Signals in Animals

Neural Regulation in Animals

Sensation and Movement in Animals

An Overview of Ecology

Behavioral Ecology

Populations and Life History Traits

Biodiversity and Communities

Energy Flow and Chemical Cycling in Ecosystems

Conservation and Global Ecology

Filters

How many electron pairs are shared between carbon atoms in a molecule that has the formula C₂H₄?