CHEM 115 PRACTICE EXAM 2026/2027 QUESTIONS AND
SOLUTIONS RATED A+
✔✔Which sequence below represents the proper order of increasing bond strength?
A) single < double < triple
B) single < triple < double
C) triple < double < single
D) double < single < triple
E) none of the abov - ✔✔A
✔✔Which of the following compounds would have a linear molecular geometry?
1. N2
2. H2S
3. CO2
A) 1 and 2 only
B) 2 and 3 only
C) 1 and 3 only
D) 1,2 and 3
E) neither 1, 2,or 3 - ✔✔C
✔✔The correct Lewis structure for BF3 would have exactly:
A) 1 triple bond.
B) no double bonds.
C) 1 double bond.
D) 2 double bonds.
E) none of the above - ✔✔B
✔✔What is the molecular geometry if you have 3 single bonds and 1 lone pair around
the central
atom?
A) linear
B) trigonal pyramidal
C) tetrahedral
D) bent
E) not enough information - ✔✔B
✔✔The central atom in the chlorite anion, ClO2
- is surrounded by
A) two bonding and two unshared pairs of electrons.
B) one bonding and three unshared pairs of electrons.
C) two bonding and one unshared pair of electrons.
D) two double bonds and no unshared pairs of electrons.
E) none of the above - ✔✔A
, ✔✔What is the electron geometry if you have 2 electron groups around the center
atom?
A) tetrahedral
B) trigonal planar
C) linear
D) trigonal bipyramidal
E) not enough information - ✔✔C
✔✔Which of the following statements is TRUE for the covalent molecule HCl?
A) Hydrogen is more electronegative and the shared electron pair is likely to be found
on the
hydrogen atom.
B) Hydrogen is more electronegative and the shared electron pair is likely to be found
on the
chlorine atom.
C) Chlorine is more electronegative and the shared electron pair is likely to be found on
the
chlorine atom.
D) Chlorine is more electronegative and the shared electron pair is likely to be found on
the
hydrogen atom.
E) none of the above - ✔✔C
✔✔What is the molecular geometry of carbon dioxide, CO2?
A) bent
B) trigonal pyramidal
C) linear
D) tetrahedral
E) not enough information - ✔✔C
✔✔Which of the following statements about Lewis structures is FALSE?
A) An octet is when an atom has 8 valence electrons.
B) A duet is a stable electron configuration for helium.
C) A covalent bond occurs when electrons are shared.
D) An ionic bond occurs when electrons are transferred.
E) All of the above statements are true - ✔✔C
✔✔What is the molecular geometry if you have 4 single bonds around the central atom?
A) linear
B) tetrahedral
C) trigonal pyramidal
D) bent
E) not enough information - ✔✔E
✔✔Which compound listed below will dissolve in NH3?
SOLUTIONS RATED A+
✔✔Which sequence below represents the proper order of increasing bond strength?
A) single < double < triple
B) single < triple < double
C) triple < double < single
D) double < single < triple
E) none of the abov - ✔✔A
✔✔Which of the following compounds would have a linear molecular geometry?
1. N2
2. H2S
3. CO2
A) 1 and 2 only
B) 2 and 3 only
C) 1 and 3 only
D) 1,2 and 3
E) neither 1, 2,or 3 - ✔✔C
✔✔The correct Lewis structure for BF3 would have exactly:
A) 1 triple bond.
B) no double bonds.
C) 1 double bond.
D) 2 double bonds.
E) none of the above - ✔✔B
✔✔What is the molecular geometry if you have 3 single bonds and 1 lone pair around
the central
atom?
A) linear
B) trigonal pyramidal
C) tetrahedral
D) bent
E) not enough information - ✔✔B
✔✔The central atom in the chlorite anion, ClO2
- is surrounded by
A) two bonding and two unshared pairs of electrons.
B) one bonding and three unshared pairs of electrons.
C) two bonding and one unshared pair of electrons.
D) two double bonds and no unshared pairs of electrons.
E) none of the above - ✔✔A
, ✔✔What is the electron geometry if you have 2 electron groups around the center
atom?
A) tetrahedral
B) trigonal planar
C) linear
D) trigonal bipyramidal
E) not enough information - ✔✔C
✔✔Which of the following statements is TRUE for the covalent molecule HCl?
A) Hydrogen is more electronegative and the shared electron pair is likely to be found
on the
hydrogen atom.
B) Hydrogen is more electronegative and the shared electron pair is likely to be found
on the
chlorine atom.
C) Chlorine is more electronegative and the shared electron pair is likely to be found on
the
chlorine atom.
D) Chlorine is more electronegative and the shared electron pair is likely to be found on
the
hydrogen atom.
E) none of the above - ✔✔C
✔✔What is the molecular geometry of carbon dioxide, CO2?
A) bent
B) trigonal pyramidal
C) linear
D) tetrahedral
E) not enough information - ✔✔C
✔✔Which of the following statements about Lewis structures is FALSE?
A) An octet is when an atom has 8 valence electrons.
B) A duet is a stable electron configuration for helium.
C) A covalent bond occurs when electrons are shared.
D) An ionic bond occurs when electrons are transferred.
E) All of the above statements are true - ✔✔C
✔✔What is the molecular geometry if you have 4 single bonds around the central atom?
A) linear
B) tetrahedral
C) trigonal pyramidal
D) bent
E) not enough information - ✔✔E
✔✔Which compound listed below will dissolve in NH3?
