Question 1

Which of the following elements will most likely form an ion with a -2 charge?

Accepted Answer

A) Na 
B) S 
C) Ne 
D) Mg 
E) Cl 
A) Na 
B) S 
C) Ne 
D) Mg 
E) Cl

Question 2

Which of the following molecules is most likely to show a dipole-dipole interaction?

Accepted Answer

A) H2S 
B) CO2 
C) CH4 
D) H-C   C-H 
E) none of the above 
A) H2S 
B) CO2 
C) CH4 
D) H-C   C-H 
E) none of the above

Question 3

Which of the following statements is untrue?

Accepted Answer

A) Covalent molecules are never crystalline. 
B) Covalent molecules usually have low melting points. 
C) Covalent molecules can have nonbonding electrons. 
D) Covalent bonds can involve more than one pair of electrons. 
E) All of the above statements are true. 
A) Covalent molecules are never crystalline. 
B) Covalent molecules usually have low melting points. 
C) Covalent molecules can have nonbonding electrons. 
D) Covalent bonds can involve more than one pair of electrons. 
E) All of the above statements are true.

Question 4

Which of the following intermolecular forces best describes why molecules like CF3CF3 are soluble in liquid CO2?

Accepted Answer

A) dipole-dipole 
B) induced dipole-induced dipole 
C) dipole-induced dipole 
D) ion-dipole 
E) hydrogen bonding 
A) dipole-dipole 
B) induced dipole-induced dipole 
C) dipole-induced dipole 
D) ion-dipole 
E) hydrogen bonding

Question 5

List the following compounds in order of increasing boiling point: Cl4, CBr4, CCl4, CF4.

Accepted Answer

A) Cl4, CBr4, CCl4, CF4 
B) CF4, CBr4, CCl4, Cl4 
C) Cl4, CCl4, CBr4, CF4 
D) CF4, Cl4, CBr4, Cl4 
A) Cl4, CBr4, CCl4, CF4 
B) CF4, CBr4, CCl4, Cl4 
C) Cl4, CCl4, CBr4, CF4 
D) CF4, Cl4, CBr4, Cl4

Question 6

Two chemical structures are shown, one of a typical gasoline molecule and the other of a typical motor oil molecule. Which is which?   Base your reasoning not on memorization but rather upon what you know about molecular interactions and the various physical properties of gasoline and motor oil.

Accepted Answer

A) Structure A represents the gas molecule because there are more bonds to gain energy from, giving it a higher energy content than oil. 
B) Structure A represents motor oil, illustrating a molecule with greater induced dipole-induced dipole molecular interactions thus, the molecules are strongly attracted to one another. 
C) Structure B represents the oil molecule. Because oil molecules are smaller, they can compact closer together, giving the appearance of a thicker solution than gasoline. 
D) Structure B represents crude oil which is processed to generate longer molecules of gasoline to prevent toxic vapors from harming consumers. 
A) Structure A represents the gas molecule because there are more bonds to gain energy from, giving it a higher energy content than oil. 
B) Structure A represents motor oil, illustrating a molecule with greater induced dipole-induced dipole molecular interactions thus, the molecules are strongly attracted to one another. 
C) Structure B represents the oil molecule. Because oil molecules are smaller, they can compact closer together, giving the appearance of a thicker solution than gasoline. 
D) Structure B represents crude oil which is processed to generate longer molecules of gasoline to prevent toxic vapors from harming consumers.

Question 7

Which of the following elements will most likely form an ion with a -1 charge?

Accepted Answer

A) Na 
B) S 
C) Ne 
D) Mg 
E) Cl 
A) Na 
B) S 
C) Ne 
D) Mg 
E) Cl

Question 8

Which is more polar, a sulfur-bromine (S-Br)bond or a selenium-chlorine (Se-Cl)bond?

Accepted Answer

A) A selenium-chlorine bond should be more polar because of a greater difference in effective nuclear charge. 
B) A selenium-chlorine bond should be more polar because of a smaller difference in effective nuclear charge. 
C) A sulfur-bromine bond should be more polar because of a greater difference in effective nuclear charge. 
D) A sulfur-bromine bond should be more polar because of a smaller difference in effective nuclear charge. 
A) A selenium-chlorine bond should be more polar because of a greater difference in effective nuclear charge. 
B) A selenium-chlorine bond should be more polar because of a smaller difference in effective nuclear charge. 
C) A sulfur-bromine bond should be more polar because of a greater difference in effective nuclear charge. 
D) A sulfur-bromine bond should be more polar because of a smaller difference in effective nuclear charge.

Question 9

How do the electron-dot structures of elements in the same group in the periodic table compare with one another?

Accepted Answer

A) The structures differ by exactly two electrons between vertically consecutive elements. 
B) The number of valence shell electrons increases by one for each element from the top to the bottom of the group. 
C) Elements of the same group have the same number of valence electrons. 
D) The number of electrons in the electron-dot-structure will equal the group number for each element of the group. 
A) The structures differ by exactly two electrons between vertically consecutive elements. 
B) The number of valence shell electrons increases by one for each element from the top to the bottom of the group. 
C) Elements of the same group have the same number of valence electrons. 
D) The number of electrons in the electron-dot-structure will equal the group number for each element of the group.

Question 10

If you mix a typical iodine ion (I, atomic no. = 53)with a typical barium ion (Ba, atomic no. = 56), what compound is formed?

Accepted Answer

A) BaI2 
B) BaI 
C) Ba56I53 
D) Ba2I 
E) Ba2I2 
A) BaI2 
B) BaI 
C) Ba56I53 
D) Ba2I 
E) Ba2I2

Question 11

Which of the following elements will most likely not form an ion at all?

Accepted Answer

A) Na 
B) O 
C) Ar 
D) Mg 
E) Br 
A) Na 
B) O 
C) Ar 
D) Mg 
E) Br

Question 12

Why are ion-dipole attractions stronger than dipole-dipole attractions?

Accepted Answer

A) The chemical bond in an ion-dipole molecule is similar also a covalent bond. 
B) The magnitude of the electric charge associated with an ion is much greater. 
C) Dipole areas are subject to changing from positive to negative regions on the molecule. 
D) Like charge (dipole)does not attract like charge (another dipole.) 
A) The chemical bond in an ion-dipole molecule is similar also a covalent bond. 
B) The magnitude of the electric charge associated with an ion is much greater. 
C) Dipole areas are subject to changing from positive to negative regions on the molecule. 
D) Like charge (dipole)does not attract like charge (another dipole.)

Question 13

If an ionic bond is stronger than a dipole-dipole interaction, how can water dissolve an ionic compound?

Accepted Answer

A) The ion-dipole interactions of a bunch of water molecules gang up on the strong ionic bond and pull it into the solution. 
B) The ionic bond is weakened by the ion-dipole interactions and ionic repulsion ejects the ions from the crystal. 
C) The ion-dipole interaction causes the ions to heat up and vibrate free of the crystal. 
D) The ions never overcome their interatomic attraction and therefore are not soluble. 
E) none of the above 
A) The ion-dipole interactions of a bunch of water molecules gang up on the strong ionic bond and pull it into the solution. 
B) The ionic bond is weakened by the ion-dipole interactions and ionic repulsion ejects the ions from the crystal. 
C) The ion-dipole interaction causes the ions to heat up and vibrate free of the crystal. 
D) The ions never overcome their interatomic attraction and therefore are not soluble. 
E) none of the above

Question 14

What is the main difference between a dipole-dipole interaction and a dipole-induced dipole interaction?

Accepted Answer

A) Both are similar, but one involves a temporary dipole created by a permanent dipole. 
B) Dipole-dipole interactions are weaker because the dipoles are permanent. 
C) Dipole-induced dipole interactions are stronger because the induced dipoles can be formed at any time. 
D) Both are identical. 
E) none of the above 
A) Both are similar, but one involves a temporary dipole created by a permanent dipole. 
B) Dipole-dipole interactions are weaker because the dipoles are permanent. 
C) Dipole-induced dipole interactions are stronger because the induced dipoles can be formed at any time. 
D) Both are identical. 
E) none of the above

Question 15

What needs to be done to convert a neutral nitrogen atom into an N-3 species?

Accepted Answer

A) add three electrons 
B) remove three electrons 
C) remove three protons 
D) add three protons 
E) add three nitrogens 
A) add three electrons 
B) remove three electrons 
C) remove three protons 
D) add three protons 
E) add three nitrogens

Question 16

Why is it better to recycle metals than to mine more?

Accepted Answer

A) It takes far less energy to recycle. 
B) Mining is less expensive than recycling but not environmentally friendly. 
C) Ores contain toxic elements. 
D) all of the above 
E) none of the above 
A) It takes far less energy to recycle. 
B) Mining is less expensive than recycling but not environmentally friendly. 
C) Ores contain toxic elements. 
D) all of the above 
E) none of the above

Question 17

Which of the following is the correct electron dot structure for chlorine (atomic no. = 17)?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 18

Which of the following is NOT an ion?

Accepted Answer

A) H+1 
B) Br- 
C) O2 
D) Mg+2 
E) NO3- 
A) H+1 
B) Br- 
C) O2 
D) Mg+2 
E) NO3-

Question 19

How many chloride ions (Cl-1)are needed to balance the positive charge of a barium ion (Ba+2)?

Accepted Answer

A) 2 
B) 1 
C) -2 
D) -1 
E) 3 
A) 2 
B) 1 
C) -2 
D) -1 
E) 3

Question 20

Which of the following would have the lowest melting point?

Accepted Answer

A) CCl4 
B) CBr4 
C) CF4 
D) CI4 
E) not enough information given 
A) CCl4 
B) CBr4 
C) CF4 
D) CI4 
E) not enough information given

Exam 15: How Atoms Bond and Molecules Attract

Which of the following elements will most likely form an ion with a -2 charge?

Which of the following molecules is most likely to show a dipole-dipole interaction?

Which of the following statements is untrue?

Which of the following intermolecular forces best describes why molecules like CF3CF3 are soluble in liquid CO2?

List the following compounds in order of increasing boiling point: Cl4, CBr4, CCl4, CF4.

Two chemical structures are shown, one of a typical gasoline molecule and the other of a typical motor oil molecule. Which is which? Base your reasoning not on memorization but rather upon what you know about molecular interactions and the various physical properties of gasoline and motor oil.

Which of the following elements will most likely form an ion with a -1 charge?

Which is more polar, a sulfur-bromine (S-Br)bond or a selenium-chlorine (Se-Cl)bond?

How do the electron-dot structures of elements in the same group in the periodic table compare with one another?

If you mix a typical iodine ion (I, atomic no. = 53)with a typical barium ion (Ba, atomic no. = 56), what compound is formed?

Which of the following elements will most likely not form an ion at all?

Why are ion-dipole attractions stronger than dipole-dipole attractions?

If an ionic bond is stronger than a dipole-dipole interaction, how can water dissolve an ionic compound?

What is the main difference between a dipole-dipole interaction and a dipole-induced dipole interaction?

What needs to be done to convert a neutral nitrogen atom into an N-3 species?

Why is it better to recycle metals than to mine more?

Which of the following is the correct electron dot structure for chlorine (atomic no. = 17)?

Which of the following is NOT an ion?

How many chloride ions (Cl-1)are needed to balance the positive charge of a barium ion (Ba+2)?

Which of the following would have the lowest melting point?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

Filters

Which of the following intermolecular forces best describes why molecules like CF₃CF₃ are soluble in liquid CO₂?

List the following compounds in order of increasing boiling point: Cl₄, CBr₄, CCl₄, CF₄.

What needs to be done to convert a neutral nitrogen atom into an N^-3 species?

How many chloride ions (Cl^-1)are needed to balance the positive charge of a barium ion (Ba⁺²)?