CHEMISTRY 101 FINAL EXAM PRACTICE QUESTIONS
WITH VERIFIED ANSWERS
Which of the following molecules have an atom with an expanded octet?
a) CO₂
b) Br₂
c) SCl₂
d) BF₃
e) PCl₃ - Answers - c) SCl₄
Determine the electron geometry (eq) and molecular geometry (mg) of BrF₄⁺. - Answers
- eg: trigonal bipyramidal
mg: see-saw
Sort the following atoms in order of increasing electronegativity: As, Se, Sn. - Answers -
Sn < As < Se
Which of the following statements about molecular polarity is true?
a) The greater the difference in electronegativity between two atoms in a bond, the
more equally the electrons are shared.
b) A nonpolar molecule has only nonpolar bonds.
c) All molecules with polar bonds are polar.
d) The shape of a molecule is important in determining the molecular polarity.
e) All of the above statements are true. - Answers - d) The shape of a molecule is
important in determining the molecular polarity.
Choose the best Lewis structure for CNS⁻. - Answers -
http://chemwiki.ucdavis.edu/@api/deki/files/10292/CNS_best.jpg?revision=1
Construct the best Lewis structure for ICl₅. - Answers - http://www.tutor-
homework.com/Chemistry_Help/Molecular_Geometry/ICl5.gif
Which of the following statements is false?
a) Neutral molecules always have a zero formal charge on all atoms.
b) When formal charge cannot be avoided, negative formal charge should reside on the
most electronegative atom.
c) The sum of all formal charge in an ion must be equal to the charge of the ion.
d) Formal chargers closer to zero on individual atoms are generally better than larger
ones. - Answers - a) Neutral molecules always have zero formal charge on all atoms.
Which of the following bonds is the shortest?
a) single
b) double
c) triple
WITH VERIFIED ANSWERS
Which of the following molecules have an atom with an expanded octet?
a) CO₂
b) Br₂
c) SCl₂
d) BF₃
e) PCl₃ - Answers - c) SCl₄
Determine the electron geometry (eq) and molecular geometry (mg) of BrF₄⁺. - Answers
- eg: trigonal bipyramidal
mg: see-saw
Sort the following atoms in order of increasing electronegativity: As, Se, Sn. - Answers -
Sn < As < Se
Which of the following statements about molecular polarity is true?
a) The greater the difference in electronegativity between two atoms in a bond, the
more equally the electrons are shared.
b) A nonpolar molecule has only nonpolar bonds.
c) All molecules with polar bonds are polar.
d) The shape of a molecule is important in determining the molecular polarity.
e) All of the above statements are true. - Answers - d) The shape of a molecule is
important in determining the molecular polarity.
Choose the best Lewis structure for CNS⁻. - Answers -
http://chemwiki.ucdavis.edu/@api/deki/files/10292/CNS_best.jpg?revision=1
Construct the best Lewis structure for ICl₅. - Answers - http://www.tutor-
homework.com/Chemistry_Help/Molecular_Geometry/ICl5.gif
Which of the following statements is false?
a) Neutral molecules always have a zero formal charge on all atoms.
b) When formal charge cannot be avoided, negative formal charge should reside on the
most electronegative atom.
c) The sum of all formal charge in an ion must be equal to the charge of the ion.
d) Formal chargers closer to zero on individual atoms are generally better than larger
ones. - Answers - a) Neutral molecules always have zero formal charge on all atoms.
Which of the following bonds is the shortest?
a) single
b) double
c) triple
