Chapter 7: Q87 E (page 402)
Explain the difference between electron-pair geometry and molecular structure.
The main difference between electron-pair geometry and molecular structure is that the latter considers the bonding-pair geometry whereas the former considers placement of electrons.
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What feature of a Lewis structure can be used to tell if a molecule’s (or ion’s) electron-pair geometry and molecular structure will be identical?
Question: Using the standard enthalpy of formation data in Appendix G, calculate the bond energy of the carbon-sulphur double bond in \({\rm{C}}{{\rm{S}}_{\rm{2}}}\).
Determine the formal charge of each element in the following:
(a) \({{\rm{H}}_{\rm{3}}}{{\rm{O}}^{\rm{ + }}}\)
(b) \({\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}\)
(c) \({\rm{N}}{{\rm{H}}_{\rm{3}}}\)
(d) \({\rm{O}}_{\rm{2}}^{{\rm{2 - }}}\)
(e) \({{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\)
A molecule with the formula\({\rm{A}}{{\rm{B}}_{\rm{3}}}\), in which A and B represent different atoms, could have one of three different shapes. Sketch and name the three different shapes that this molecule might have. Give an example of a molecule or ion that has each shape.
Question: When a molecule can form two different structures, the structure with the stronger bonds is usually the more stable form. Use bond energies to predict the correct structure of the hydroxylamine molecule:
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