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WorksheetsExam 5 Review
Total questions: 23
Worksheet time: 2hrs 35mins
Many silicone oligomers can be formed from chlorosilane precursors, making silicones a very attractive class of compounds for industrial use. In the vinyl-terminated silicone oligomer below, how many single, double, and triple bonds are there? Remember to count the C-H bonds on the methyl groups.
22 single bonds, 0 double bonds, 2 triple bonds
22 single bonds, 2 double bonds, 2 triple bonds
22 single bonds, 4 double bonds, 0 triple bonds
24 single bonds, 0 double bonds, 2 triple bonds
24 single bonds, 2 double bonds, 2 triple bonds
A Lewis structure of the chromate ion is below. According to Lewis theory, what is the order of the Cr-O bonds?
(a)
According to VSEPR theory, the molecular geometry of the CHCl3 molecule is
Linear
Trigonal planar
Trigonal pyramidal
Tetrahedral
Trigonal bipyramidal
The Lewis symbol of an element shows it has three paired electrons and one unpaired electron. How many bonds is it likely to form?
(a)
Which of the following substances would be the most non-polar?
A
B
C
D
What is the formal charge on gallium if it does form four bonds, like in GaH4-?
(a)
In the best resonance structure for OCN- what is the formal charge on nitrogen?
(a)
Which of the following compounds can or does violate the octet rule?
XeBr4
SO2
O3
NO43-
BFCl2
The most reactive molecules will…
have resonance.
have unpaired electrons.
have lone pairs on all atoms.
have higher order bonds.
What is the correct ordering of the bond lengths in the best Lewis structures for ClO2-, ClO3-, ClO4-?
ClO2- < ClO3- < ClO4-
ClO4- < ClO3- < ClO2-
ClO3- < ClO2- < ClO4-
ClO2- < ClO4- < ClO3-
ClO3- < ClO4- < ClO2-
Which of the following atoms would have a trigonal planar molecular geometry?
CA, CE
CB, CC, CD, N
CB, CC, CD
All of the carbons
All of the central atoms
Which of the following molecules would have polar bonds but no net dipole moment?
SF6
BH3
NH3
KrBr42+
SiCl4
Which of the following compounds would have Lewis structures that correctly contained no bonds?
Sc2O3
LiClO4
KCl
H3O+
NH4NO3
Using average bond energies found at the URL below, what is two times the heat of formation of HBr (g)? Remember that heat of formation reactions form one mole of a substance from its constituent elements in their standard states.
https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Chemical_Bonding/Fundamentals_of_Chemical_Bonding/Bond_Energies
(a)
The potential energy vs the internuclear distance of a diatomic molecule is graphed. What is true of the minimum?
It indicates the bond length
It indicates the energy released when a bond forms
It happens at 0 kJ/mol
It happens when the two nuclei are on top of each other
It happens when the two atoms are very far away from each other
An element with sp hybridization would have which of the following electron geometries?
Linear
Trigonal planar
Tetrahedral
Trigonal bipyramidal
Octahedral
In the correct Lewis structure of XeOF4, how many lone pairs of electrons does Xe have?
(a)
According to Valence Bond Theory, a pi bond is formed by…
The overlapping of atomic orbitals on the axis of nuclei
Mutual sharing of p-electrons
Sideways overlapping of half-filled p-orbitals
Overlapping of s-orbitals with p-orbital
How many sigma and pi bonds are present in toluene, shown here?
7σ and 3π bonds
12σ and 3π bonds
15σ and 3π bonds
6σ and 6π bonds
True or False: according to Valence Bond Theory, overlapping of any two pure atomic p-orbitals leads to sigma bond formation.
True
False
How many sigma s–sp3 bonds are there in acetaldehyde, pictured here?
3
4
5
6
7
According to Valence Bond Theory, what determines the shape of a molecule?
Sigma bonds
Pi bonds
Both sigma and pi bonds
Neither sigma nor pi bonds
According to VSEPR theory, which of the following has a bond angle of 120°?
PH3
NCl3
ClF3
BCl3
