WCU CHEM 280 Final Exam Review
Correct Questions And Answers
Bonding theories are used to predict how atoms bond together to form molecules. (T/F)
Correct Answers TRUE
Drugs to fight HIV have been developed using bonding theory models (T/F) Correct
Answers TRUE
Li : is the proper Lewis structure (dot structure) for lithium. (T/F) Correct Answers
FALSE
A chemical bond is classified as a covalent bond if it involves the transfer of electrons.
(T/F) Correct Answers FALSE
The Lewis structure of oxygen should have 8 valence electrons. (T/F) Correct Answers
FALSE
Lewis structures only use the valence electrons in determining the bonding. (T/F)
Correct Answers TRUE
Having eight valence electrons is very stable and is called an octet. (T/F) Correct
Answers TRUE
A correct Lewis structure for an atom of carbon would have eight dots surrounding the
symbol of the element. (T/F) Correct Answers FALSE
The correct Lewis structure for potassium in KCl is K+. (T/F) Correct Answers TRUE
Chlorine has 8 valence electrons in the Lewis structure for KCl. (T/F) Correct Answers
TRUE
The Lewis theory predicts that the formula for a compound of magnesium and sulfur is
MgS2. (T/F) Correct Answers FALSE
The Lewis theory predicts that the formula for a compound made of sodium and fluorine
is NaF. (T/F) Correct Answers TRUE
Lewis theory predicts that the formula for a compound made of aluminum and
phosphorus is AlP. (T/F) Correct Answers TRUE
The Lewis structure of water has two sets of lone pair electrons. (T/F) Correct Answers
TRUE
,The structure :H(-x3)H: is a proper representation of the bonding in the H2 molecule.
(T/F) Correct Answers FALSE
The Lewis structure for O2 contains a triple bond. (T/F) Correct Answers FALSE
The double bond is shorter and stronger than a single bond. (T/F) Correct Answers
TRUE
The triple bond present in diatomic nitrogen, N2, is what makes this molecule so
reactive. (T/F) Correct Answers FALSE
When calculating the number of electrons for the Lewis structure of a polyatomic ion,
subtract one electron for each negative charge. (T/F) Correct Answers FALSE
The correct Lewis structure for CO2 shows that the molecule contains two double
bonds. (T/F) Correct Answers TRUE
The correct Lewis structure for CO2 shows that the carbon atom has two sets of lone
pair electrons. (T/F) Correct Answers FALSE
When calculating the number of electrons for the Lewis structure of a polyatomic ion,
you must add one electron for each negative charge and subtract one electron for each
positive charge. (T/F) Correct Answers TRUE
The sulfate ion contains 28 valence electrons. (T/F) Correct Answers FALSE
The ammonium ion contains 10 valence electrons. (T/F) Correct Answers FALSE
Boron forms compounds that violate the octet rule. (T/F) Correct Answers TRUE
Resonance structures are the best representation we can draw but do not accurately
reflect the true structure. (T/F) Correct Answers TRUE
Carbon monoxide contains resonance Lewis structures. (T/F) Correct Answers FALSE
The VSEPR theory predicts that the angle between the central carbon atom and the two
oxygen atoms in CO2 measures 180°. (T/F) Correct Answers TRUE
The VSEPR theory predicts that the H-C-H angle in CH4 measures 120°. (T/F) Correct
Answers FALSE
It is important to identify lone pairs around a central atom because they do not repel
other electron groups. (T/F) Correct Answers FALSE
, The electron geometry of a molecule is never the same as its molecular geometry. (T/F)
Correct Answers FALSE
When you have 2 electron groups and none are lone pairs, the molecular geometry is
linear. (T/F) Correct Answers TRUE
When you have 4 electron groups and 1 of them is a lone pair, the molecular geometry
is bent. (T/F) Correct Answers FALSE
When you have 4 electron groups and none of them are lone pairs, the molecular
geometry is trigonal pyramidal. (T/F) Correct Answers FALSE
When you have 4 electron groups, the electron geometry is tetrahedral. (T/F) Correct
Answers TRUE
The compound H2S contains polar bonds but the molecule is nonpolar. (T/F) Correct
Answers FALSE
Water and oil do not mix because water molecules are nonpolar and molecules that
compose oil are generally polar. (T/F) Correct Answers FALSE
What is the angle between electron groups in the linear electron geometry? Correct
Answers 180°
What is the angle between electron groups in the trigonal planar electron geometry?
Correct Answers 120°
What is the angle between electron groups in the tetrahedral geometry? Correct
Answers 109.5°
Which of the following is considered a single electron group?
A) a lone pair of electrons
B) a single bond
C) a double bond
D) a triple bond
E) all the above Correct Answers all of the above
What is the electron geometry if you have 4 electron groups around the center atom?
Correct Answers tetrahedral
What is the electron geometry if you have 2 electron groups around the center atom?
Correct Answers linear
What is the electron geometry if you have 3 electron groups around the center atom?
Correct Answers trigonal planar
Correct Questions And Answers
Bonding theories are used to predict how atoms bond together to form molecules. (T/F)
Correct Answers TRUE
Drugs to fight HIV have been developed using bonding theory models (T/F) Correct
Answers TRUE
Li : is the proper Lewis structure (dot structure) for lithium. (T/F) Correct Answers
FALSE
A chemical bond is classified as a covalent bond if it involves the transfer of electrons.
(T/F) Correct Answers FALSE
The Lewis structure of oxygen should have 8 valence electrons. (T/F) Correct Answers
FALSE
Lewis structures only use the valence electrons in determining the bonding. (T/F)
Correct Answers TRUE
Having eight valence electrons is very stable and is called an octet. (T/F) Correct
Answers TRUE
A correct Lewis structure for an atom of carbon would have eight dots surrounding the
symbol of the element. (T/F) Correct Answers FALSE
The correct Lewis structure for potassium in KCl is K+. (T/F) Correct Answers TRUE
Chlorine has 8 valence electrons in the Lewis structure for KCl. (T/F) Correct Answers
TRUE
The Lewis theory predicts that the formula for a compound of magnesium and sulfur is
MgS2. (T/F) Correct Answers FALSE
The Lewis theory predicts that the formula for a compound made of sodium and fluorine
is NaF. (T/F) Correct Answers TRUE
Lewis theory predicts that the formula for a compound made of aluminum and
phosphorus is AlP. (T/F) Correct Answers TRUE
The Lewis structure of water has two sets of lone pair electrons. (T/F) Correct Answers
TRUE
,The structure :H(-x3)H: is a proper representation of the bonding in the H2 molecule.
(T/F) Correct Answers FALSE
The Lewis structure for O2 contains a triple bond. (T/F) Correct Answers FALSE
The double bond is shorter and stronger than a single bond. (T/F) Correct Answers
TRUE
The triple bond present in diatomic nitrogen, N2, is what makes this molecule so
reactive. (T/F) Correct Answers FALSE
When calculating the number of electrons for the Lewis structure of a polyatomic ion,
subtract one electron for each negative charge. (T/F) Correct Answers FALSE
The correct Lewis structure for CO2 shows that the molecule contains two double
bonds. (T/F) Correct Answers TRUE
The correct Lewis structure for CO2 shows that the carbon atom has two sets of lone
pair electrons. (T/F) Correct Answers FALSE
When calculating the number of electrons for the Lewis structure of a polyatomic ion,
you must add one electron for each negative charge and subtract one electron for each
positive charge. (T/F) Correct Answers TRUE
The sulfate ion contains 28 valence electrons. (T/F) Correct Answers FALSE
The ammonium ion contains 10 valence electrons. (T/F) Correct Answers FALSE
Boron forms compounds that violate the octet rule. (T/F) Correct Answers TRUE
Resonance structures are the best representation we can draw but do not accurately
reflect the true structure. (T/F) Correct Answers TRUE
Carbon monoxide contains resonance Lewis structures. (T/F) Correct Answers FALSE
The VSEPR theory predicts that the angle between the central carbon atom and the two
oxygen atoms in CO2 measures 180°. (T/F) Correct Answers TRUE
The VSEPR theory predicts that the H-C-H angle in CH4 measures 120°. (T/F) Correct
Answers FALSE
It is important to identify lone pairs around a central atom because they do not repel
other electron groups. (T/F) Correct Answers FALSE
, The electron geometry of a molecule is never the same as its molecular geometry. (T/F)
Correct Answers FALSE
When you have 2 electron groups and none are lone pairs, the molecular geometry is
linear. (T/F) Correct Answers TRUE
When you have 4 electron groups and 1 of them is a lone pair, the molecular geometry
is bent. (T/F) Correct Answers FALSE
When you have 4 electron groups and none of them are lone pairs, the molecular
geometry is trigonal pyramidal. (T/F) Correct Answers FALSE
When you have 4 electron groups, the electron geometry is tetrahedral. (T/F) Correct
Answers TRUE
The compound H2S contains polar bonds but the molecule is nonpolar. (T/F) Correct
Answers FALSE
Water and oil do not mix because water molecules are nonpolar and molecules that
compose oil are generally polar. (T/F) Correct Answers FALSE
What is the angle between electron groups in the linear electron geometry? Correct
Answers 180°
What is the angle between electron groups in the trigonal planar electron geometry?
Correct Answers 120°
What is the angle between electron groups in the tetrahedral geometry? Correct
Answers 109.5°
Which of the following is considered a single electron group?
A) a lone pair of electrons
B) a single bond
C) a double bond
D) a triple bond
E) all the above Correct Answers all of the above
What is the electron geometry if you have 4 electron groups around the center atom?
Correct Answers tetrahedral
What is the electron geometry if you have 2 electron groups around the center atom?
Correct Answers linear
What is the electron geometry if you have 3 electron groups around the center atom?
Correct Answers trigonal planar
