CHEM 1411 FINAL REVIEW EXAM
QUESTIONS WITH 100% CORRECT
ANSWERS L LATEST VERSION 2025/2026.
According to the octet rule, a magensium atom has a tendency to - ANS lose two electrons
A diatomic molecule with a triple covalent bond is - ANS N2
Which of the following pairs of elements can be joined by a covalent bond? - ANS N and C
Which of the following is an iconic compound? - ANS Na2O
According to VSEPR theory, the shape of an ammonium ion, NH4+, is most similar to -
ANS CH4
What is the electron group and molecular geometry of an ammonium ion? - ANS EG & MG
tetrahedral
What is the EG and MG of an ammonia molecule? - ANS EG tetrahedral and MG trigonal
pyramidal
Which of the following molecules has the greatest bond energy? - ANS N2
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, Based off periodic trends, which of the following has the strongest lattice energy? -
ANS Aluminum chloride
Construct the molecule IF5 and PF5. How do the molecular shapes differ? - ANS In IF5 there
is a lone pair of electrons on iodine where as in a PF5 there are no lone pairs on phosphorus. As
a result, the molecular shape of IF5 is square pyramidal and PF5 is trigonal bipyramidal.
Using VSEPR theory, predict the molecule shape of a molecule that contains 2 electron groups. -
ANS Linear
Using VSEPR theory, predict the electron group geometry, molecular shape and the bond angles
in a molecule that contains 4 electron groups (3 bonds and 1 lone pair). - ANS Tetrahedral,
trigonal pyramidal, <109.5
Using VSEPR theory, predict the electron group geometry, molecular shape and the bond angles
in a molecule that contains 5 electron groups (2 bonds and 3 lone pairs) - ANS Trigonal
bipyramidal, linear and 180
Using VSEPR theory, predict the molecular shape and bond angles in BCI3 - ANS Trigonal
planar, 120
The bond angles in CH4, Nh3, H2O are 109.5, 107 and 104.5 respectfully. Which of the
statements best describes the variance in bond angles? - ANS CH4 has no lone pairs of
electrons on the central atom so the optimal molecular shape would be tetrahedrale with bond
angles of 109.5. In NH3 and H2O there are 1 and 2 lone pairs, respectfully, so more repulsion
exists between the bonds and lone pairs as a result the bond angles are less than 109.5
A covalent bond is formed when two atoms - ANS share one or more pairs of electrons with
each other
According to the octet rule, a bromine atom has a tendency to - ANS gain one electron
The halogens have how many valence electrons? - ANS 7
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS WITH 100% CORRECT
ANSWERS L LATEST VERSION 2025/2026.
According to the octet rule, a magensium atom has a tendency to - ANS lose two electrons
A diatomic molecule with a triple covalent bond is - ANS N2
Which of the following pairs of elements can be joined by a covalent bond? - ANS N and C
Which of the following is an iconic compound? - ANS Na2O
According to VSEPR theory, the shape of an ammonium ion, NH4+, is most similar to -
ANS CH4
What is the electron group and molecular geometry of an ammonium ion? - ANS EG & MG
tetrahedral
What is the EG and MG of an ammonia molecule? - ANS EG tetrahedral and MG trigonal
pyramidal
Which of the following molecules has the greatest bond energy? - ANS N2
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Based off periodic trends, which of the following has the strongest lattice energy? -
ANS Aluminum chloride
Construct the molecule IF5 and PF5. How do the molecular shapes differ? - ANS In IF5 there
is a lone pair of electrons on iodine where as in a PF5 there are no lone pairs on phosphorus. As
a result, the molecular shape of IF5 is square pyramidal and PF5 is trigonal bipyramidal.
Using VSEPR theory, predict the molecule shape of a molecule that contains 2 electron groups. -
ANS Linear
Using VSEPR theory, predict the electron group geometry, molecular shape and the bond angles
in a molecule that contains 4 electron groups (3 bonds and 1 lone pair). - ANS Tetrahedral,
trigonal pyramidal, <109.5
Using VSEPR theory, predict the electron group geometry, molecular shape and the bond angles
in a molecule that contains 5 electron groups (2 bonds and 3 lone pairs) - ANS Trigonal
bipyramidal, linear and 180
Using VSEPR theory, predict the molecular shape and bond angles in BCI3 - ANS Trigonal
planar, 120
The bond angles in CH4, Nh3, H2O are 109.5, 107 and 104.5 respectfully. Which of the
statements best describes the variance in bond angles? - ANS CH4 has no lone pairs of
electrons on the central atom so the optimal molecular shape would be tetrahedrale with bond
angles of 109.5. In NH3 and H2O there are 1 and 2 lone pairs, respectfully, so more repulsion
exists between the bonds and lone pairs as a result the bond angles are less than 109.5
A covalent bond is formed when two atoms - ANS share one or more pairs of electrons with
each other
According to the octet rule, a bromine atom has a tendency to - ANS gain one electron
The halogens have how many valence electrons? - ANS 7
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
