Molecular and Ionic Bonding
When constructing the best Lewis diagram for hypochlorite ion ClO-, what total number of resonance structures should be drawn showing all possible placements for pi bonds if any exist?
Two
Three
None
One
How many single bonds does CCl₄ have?
4
1
3
2
Which element commonly forms a diatomic molecule by sharing one pair of electrons to complete its octet?
Fluorine (F2)
Nitrogen (N2)
Oxygen (O2)
Hydrogen (H2)
Given that boron trifluoride (BF3) often acts as a Lewis acid, which molecule would most likely form a stable adduct with BF3 by donating an electron pair?
N2
CF4
NH3
CO2
What is the most likely reason that NH3 acts as a polar molecule?
The NH bond length is shorter than typical covalent bonds causing polarity.
The presence of a lone pair on nitrogen creates an asymmetrical charge distribution.
NH3 has delocalized pi electrons generating an uneven charge distribution.
Nitrogen has a lower electronegativity than hydrogen, leading to polarity.
Which substance would likely have the highest boiling point based on its intermolecular forces?
Methane (CH4), due to weak London dispersion forces.
Neon gas (Ne), due to very weak London dispersion forces.
Hydrogen fluoride (HF), due to strong hydrogen bonding.
Carbon tetrachloride (CCl4), due to moderate London dispersion forces.
For which scenario would the Gibb’s free energy equation ΔG = ΔH - TΔS predict a spontaneous reaction only above a certain temperature?
When both ΔH and ΔS are positive values.
When both ΔH and ΔS are negative values.
When ΔH is positive and ΔS is negative.
When Η is negative and S is positive.

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Which property justifies using XeF4 as an example when explaining square planar molecular geometry?
The square planar geometry results in a nonzero dipole moment which is characteristic for XeF4 due to the polarity of Xe-F bonds.
The fluorine atoms and two lone pairs on xenon are arranged symmetrically around the central atom at right angles.
XeF4 displays a linear structure similar to CO2, making it suitable for discussing linear geometries despite being actually square planar.
Xenon being part of group 18 is not supposed to form stable compounds, properties like XeF4 make it an exception and interesting example.
What is the predicted molecular shape of carbon dioxide (CO2) according to its Lewis diagram?
Tetrahedral
Linear
Bent
Trigonal planar
Which molecule would have a polar overall dipole moment due to asymmetrical charge distribution?
NH3
O2
CCl4
N2