Question 1

Lewis electron dot structures represent the

Accepted Answer

A)  number of unpaired electrons in an atom. 
B)  total number of electrons in the atom. 
C)  number of protons in the atom. 
D)  number of valence electrons. 
E)  number of nonbonding electrons. 
A)  number of unpaired electrons in an atom. 
B)  total number of electrons in the atom. 
C)  number of protons in the atom. 
D)  number of valence electrons. 
E)  number of nonbonding electrons.

Question 2

A polyatomic ion

Accepted Answer

A)  has many atoms, one of which has gained or lost electrons. 
B)  is a molecule that has gained or lost electrons. 
C)  has many atoms, one of which has gained or lost protons. 
D)  is a molecule that has gained or lost protons. 
E)  has many charges. 
A)  has many atoms, one of which has gained or lost electrons. 
B)  is a molecule that has gained or lost electrons. 
C)  has many atoms, one of which has gained or lost protons. 
D)  is a molecule that has gained or lost protons. 
E)  has many charges.

Question 3

Calcium carbonate has the formula CaCO3. What is the charge on the polyatomic carbonate ion?

Accepted Answer

A)  +2 
B)  +1 
C)  0 
D)  (F1F1F1S1F1F1F101) 
E)  (F1F1F1S1F1F1F102) 
A)  +2 
B)  +1 
C)  0 
D)  (F1F1F1S1F1F1F101) 
E)  (F1F1F1S1F1F1F102)

Question 4

What is the meaning of the "wedge bond" in the following structure?

Accepted Answer

A)  This bond projects toward the viewer. 
B)  This bond projects away from the viewer. 
C)  This bond is in the plane of the paper. 
D)  These are nonbonding electrons. 
E)  It has no particular meaning. 
A)  This bond projects toward the viewer. 
B)  This bond projects away from the viewer. 
C)  This bond is in the plane of the paper. 
D)  These are nonbonding electrons. 
E)  It has no particular meaning.

Question 5

Ethanol is an alcohol found in wine and beer and it is also used as a fuel. It has the structure shown below. What is the strongest type of intermolecular interaction attracting molecules of ethanol together?

Accepted Answer

A)  ionic bonding 
B)  covalent bonding 
C)  dispersion forces 
D)  dipole-dipole forces 
E)  hydrogen bonding forces 
A)  ionic bonding 
B)  covalent bonding 
C)  dispersion forces 
D)  dipole-dipole forces 
E)  hydrogen bonding forces

Question 6

According to this diagram showing the boiling of liquid water, what happens to liquid water when it boils?

Accepted Answer

A)  The water turns into hydrogen and oxygen gas. 
B)  Covalent bonds in water are broken. 
C)  Hydrogen bonding forces are broken. 
D)  Covalent bonds in water are formed. 
E)  Hydrogen bonding forces are formed. 
A)  The water turns into hydrogen and oxygen gas. 
B)  Covalent bonds in water are broken. 
C)  Hydrogen bonding forces are broken. 
D)  Covalent bonds in water are formed. 
E)  Hydrogen bonding forces are formed.

Question 7

Water (H2O) has a higher boiling point than methane (CH4) because water has _______ between molecules.

Accepted Answer

A)  ionic bonding 
B)  covalent bonding 
C)  dispersion forces 
D)  dipole-dipole forces 
E)  hydrogen bonding forces 
A)  ionic bonding 
B)  covalent bonding 
C)  dispersion forces 
D)  dipole-dipole forces 
E)  hydrogen bonding forces

Question 8

Carbon tetrafluoride is a refrigerant and potent greenhouse gas. Which of the following is the molecular formula for this compound?

Accepted Answer

A)  CF 
B)  C(IV)F 
C)  C4F4 
D)  C4F 
E)  CF4 
A)  CF 
B)  C(IV)F 
C)  C4F4 
D)  C4F 
E)  CF4

Question 9

What is the name of CaCO3, a common calcium supplement and antacid?

Accepted Answer

A)  calcium carbon trioxide 
B)  calcium bicarbonate 
C)  calcium carbonate 
D)  calcium cyanide 
E)  calcium chlorite 
A)  calcium carbon trioxide 
B)  calcium bicarbonate 
C)  calcium carbonate 
D)  calcium cyanide 
E)  calcium chlorite

Question 10

When determining the shape of a molecule, it is necessary to count electron groups. Which of the following is NOT an electron group?

Accepted Answer

A)  a single bond 
B)  a double bond 
C)  a triple bond 
D)  a core electron 
E)  a nonbonding pair of electrons. 
A)  a single bond 
B)  a double bond 
C)  a triple bond 
D)  a core electron 
E)  a nonbonding pair of electrons.

Question 11

Below is an illustration of an atom of fluorine. Which arrow points to the part of the atom involved in bonding?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  Both B and C 
E)  None of the above are involved in bonding. 
A)  A 
B)  B 
C)  C 
D)  Both B and C 
E)  None of the above are involved in bonding.

Question 12

Which of the following wedge-dash drawings best represents the ball-and-stick model of methane as it is drawn below?

Accepted Answer

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

Question 13

Which bond is correctly labeled with a dipole arrow?

Accepted Answer

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

Question 14

The electronegativity difference between C and O is ____ and therefore the C-O bond is a(n)____ bond.

Accepted Answer

A)  1.0; nonpolar covalent 
B)  6.0; polar covalent 
C)  (F1F1F1S1F1F1F101.0; ionic) 
D)  6.0; nonpolar covalent 
E)  1.0; polar covalent 
A)  1.0; nonpolar covalent 
B)  6.0; polar covalent 
C)  (F1F1F1S1F1F1F101.0; ionic) 
D)  6.0; nonpolar covalent 
E)  1.0; polar covalent

Question 15

Which of the following interactions is the strongest?

Accepted Answer

A)  dipole-dipole forces 
B)  hydrogen bonding forces 
C)  dispersion forces 
D)  covalent bond 
E)  All of the above interactions have the same strength. 
A)  dipole-dipole forces 
B)  hydrogen bonding forces 
C)  dispersion forces 
D)  covalent bond 
E)  All of the above interactions have the same strength.

Question 16

What is the purpose of Valence Shell Electron Pair Repulsion (VSEPR) theory?

Accepted Answer

A)  To predict which atom is the central atom in a Lewis structure. 
B)  To identify the lone pair and valence electrons in a molecule. 
C)  To determine the shape of a molecule from the Lewis structure. 
D)  To determine the shape of a molecule from a molecular model. 
E)  To determine the arrangement of valence electrons in an atom. 
A)  To predict which atom is the central atom in a Lewis structure. 
B)  To identify the lone pair and valence electrons in a molecule. 
C)  To determine the shape of a molecule from the Lewis structure. 
D)  To determine the shape of a molecule from a molecular model. 
E)  To determine the arrangement of valence electrons in an atom.

Question 17

Which of the following models does NOT contain a carbon with tetrahedral geometry? Assume that all atoms in all structures are visible.

Accepted Answer

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

Question 18

Atom X in a molecule has tetrahedral electron geometry but a bent molecular shape. Which of the following describes the identity of atom X?

Accepted Answer

A)  Atom X is the oxygen in a molecule of H2O. 
B)  Atom X is the nitrogen in a molecule of NH3. 
C)  Atom X is the hydrogen in a molecule of CH4. 
D)  Atom X is the carbon in a molecule of CH4. 
E)  Atom X could be any of these atoms. 
A)  Atom X is the oxygen in a molecule of H2O. 
B)  Atom X is the nitrogen in a molecule of NH3. 
C)  Atom X is the hydrogen in a molecule of CH4. 
D)  Atom X is the carbon in a molecule of CH4. 
E)  Atom X could be any of these atoms.

Question 19

Why do electrons around a central atom arrange themselves as far apart from one another as possible, while still remaining attached to the central atom?

Accepted Answer

A)  Actually, electrons don't do this, but atoms do. 
B)  The like charges of the electrons attract each other. 
C)  The protons direct the electrons to do this. 
D)  The like charges of the electrons repel each other. 
E)  There is no reason for this arrangement, it is just observed to be that way. 
A)  Actually, electrons don't do this, but atoms do. 
B)  The like charges of the electrons attract each other. 
C)  The protons direct the electrons to do this. 
D)  The like charges of the electrons repel each other. 
E)  There is no reason for this arrangement, it is just observed to be that way.

Question 20

The structure below is the Lewis structure of methane. The Lewis structure tells us many things about methane that are useful. However, it also suggests one characteristic of methane that is, in fact, false. What is this one characteristic?

Accepted Answer

A)  The Lewis structure suggests that carbon has a full valence shell, but it really doesn't. 
B)  The Lewis structure suggests that carbon has four bonds, but it really doesn't. 
C)  The Lewis structure suggests that carbon is bonded to four hydrogens, but it really isn't. 
D)  The Lewis structure suggests that methane is flat, but it really isn't. 
E)  The Lewis structure suggests that methane is stable, but it really isn't. 
A)  The Lewis structure suggests that carbon has a full valence shell, but it really doesn't. 
B)  The Lewis structure suggests that carbon has four bonds, but it really doesn't. 
C)  The Lewis structure suggests that carbon is bonded to four hydrogens, but it really isn't. 
D)  The Lewis structure suggests that methane is flat, but it really isn't. 
E)  The Lewis structure suggests that methane is stable, but it really isn't.

Lewis electron dot structures represent the

A polyatomic ion

Calcium carbonate has the formula CaCO₃. What is the charge on the polyatomic carbonate ion?

What is the meaning of the "wedge bond" in the following structure?

Ethanol is an alcohol found in wine and beer and it is also used as a fuel. It has the structure shown below. What is the strongest type of intermolecular interaction attracting molecules of ethanol together?

According to this diagram showing the boiling of liquid water, what happens to liquid water when it boils?

Water (H₂O) has a higher boiling point than methane (CH₄) because water has _______ between molecules.

Carbon tetrafluoride is a refrigerant and potent greenhouse gas. Which of the following is the molecular formula for this compound?

What is the name of CaCO₃, a common calcium supplement and antacid?

When determining the shape of a molecule, it is necessary to count electron groups. Which of the following is NOT an electron group?

Below is an illustration of an atom of fluorine. Which arrow points to the part of the atom involved in bonding?

Which of the following wedge-dash drawings best represents the ball-and-stick model of methane as it is drawn below?

Which bond is correctly labeled with a dipole arrow?

The electronegativity difference between C and O is and therefore the C-O bond is a(n) bond.

Which of the following interactions is the strongest?

What is the purpose of Valence Shell Electron Pair Repulsion (VSEPR) theory?

Which of the following models does NOT contain a carbon with tetrahedral geometry? Assume that all atoms in all structures are visible.

Atom X in a molecule has tetrahedral electron geometry but a bent molecular shape. Which of the following describes the identity of atom X?

Why do electrons around a central atom arrange themselves as far apart from one another as possible, while still remaining attached to the central atom?

The structure below is the Lewis structure of methane. The Lewis structure tells us many things about methane that are useful. However, it also suggests one characteristic of methane that is, in fact, false. What is this one characteristic?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Chemical Quantities and Chemical Reactions

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Exam 3: Compounds and Molecules

Lewis electron dot structures represent the

A polyatomic ion

Calcium carbonate has the formula CaCO3. What is the charge on the polyatomic carbonate ion?

What is the meaning of the "wedge bond" in the following structure?

Ethanol is an alcohol found in wine and beer and it is also used as a fuel. It has the structure shown below. What is the strongest type of intermolecular interaction attracting molecules of ethanol together?

According to this diagram showing the boiling of liquid water, what happens to liquid water when it boils?

Water (H2O) has a higher boiling point than methane (CH4) because water has _______ between molecules.

Carbon tetrafluoride is a refrigerant and potent greenhouse gas. Which of the following is the molecular formula for this compound?

What is the name of CaCO3, a common calcium supplement and antacid?

When determining the shape of a molecule, it is necessary to count electron groups. Which of the following is NOT an electron group?

Below is an illustration of an atom of fluorine. Which arrow points to the part of the atom involved in bonding?

Which of the following wedge-dash drawings best represents the ball-and-stick model of methane as it is drawn below?

Which bond is correctly labeled with a dipole arrow?

The electronegativity difference between C and O is ____ and therefore the C-O bond is a(n)____ bond.

Which of the following interactions is the strongest?

What is the purpose of Valence Shell Electron Pair Repulsion (VSEPR) theory?

Which of the following models does NOT contain a carbon with tetrahedral geometry? Assume that all atoms in all structures are visible.

Atom X in a molecule has tetrahedral electron geometry but a bent molecular shape. Which of the following describes the identity of atom X?

Why do electrons around a central atom arrange themselves as far apart from one another as possible, while still remaining attached to the central atom?

The structure below is the Lewis structure of methane. The Lewis structure tells us many things about methane that are useful. However, it also suggests one characteristic of methane that is, in fact, false. What is this one characteristic?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Chemical Quantities and Chemical Reactions

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Calcium carbonate has the formula CaCO₃. What is the charge on the polyatomic carbonate ion?

Water (H₂O) has a higher boiling point than methane (CH₄) because water has _______ between molecules.

What is the name of CaCO₃, a common calcium supplement and antacid?

The electronegativity difference between C and O is and therefore the C-O bond is a(n) bond.