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Molecular Orbital Theory Worksheet: True or False Statements - Prof. David A. Laude, Assignments of Chemistry

The University of Texas at AustinChemistry
Prof. David A. Laude

A worksheet with ten statements related to molecular orbital theory. Students are required to identify if each statement is true or false, and if false, correct it. Topics covered include bond orders, molecular orbitals, electronic configurations, and magnetic properties of diatomic species.

Typology: Assignments

Pre 2010

Uploaded on 08/30/2009

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CH301๎˜ƒWorksheet๎˜ƒ8โ€”Molecular๎˜ƒOrbital๎˜ƒTheory๎˜ƒ
For๎˜ƒeach๎˜ƒof๎˜ƒthe๎˜ƒfollowing๎˜ƒstatements,๎˜ƒidentify๎˜ƒif๎˜ƒit๎˜ƒis๎˜ƒtrue๎˜ƒor๎˜ƒfalse.๎˜ƒ๎˜ƒIf๎˜ƒit๎˜ƒis๎˜ƒfalse,๎˜ƒcorrect๎˜ƒit๎˜ƒto๎˜ƒmake๎˜ƒit๎˜ƒtrue.๎˜ƒ
1. ๎˜ƒThe๎˜ƒconcept๎˜ƒof๎˜ƒฯƒ๎˜ƒand๎˜ƒฯ€๎˜ƒbonds๎˜ƒis๎˜ƒdeveloped๎˜ƒfor๎˜ƒboth๎˜ƒVSEPR๎˜ƒand๎˜ƒMO๎˜ƒtheory.๎˜ƒ
๎˜ƒ๎˜ƒ๎˜ƒ
2. There๎˜ƒare๎˜ƒthree๎˜ƒhomonuclear๎˜ƒdiatoms๎˜ƒfrom๎˜ƒthe๎˜ƒn=2๎˜ƒrow๎˜ƒthat๎˜ƒhave๎˜ƒa๎˜ƒbond๎˜ƒorder๎˜ƒof๎˜ƒ0.๎˜ƒ
๎˜ƒ๎˜ƒ
3. When๎˜ƒconstructing๎˜ƒthe๎˜ƒMO๎˜ƒenergy๎˜ƒlevels,๎˜ƒthe๎˜ƒnumber๎˜ƒof๎˜ƒmolecular๎˜ƒorbitals๎˜ƒis๎˜ƒalways๎˜ƒequal๎˜ƒto๎˜ƒthe๎˜ƒnumber๎˜ƒof๎˜ƒatomic๎˜ƒ
orbitals๎˜ƒand๎˜ƒis๎˜ƒtwice๎˜ƒthe๎˜ƒnumber๎˜ƒof๎˜ƒantibonding๎˜ƒorbitals.๎˜ƒ
๎˜ƒ๎˜ƒ
4. Hund,๎˜ƒPauli๎˜ƒand๎˜ƒAufbau๎˜ƒrules๎˜ƒthat๎˜ƒwere๎˜ƒdeveloped๎˜ƒfor๎˜ƒelectronic๎˜ƒconfigurations๎˜ƒof๎˜ƒatoms๎˜ƒalso๎˜ƒapply๎˜ƒto๎˜ƒelectronic๎˜ƒ
configurations๎˜ƒin๎˜ƒMO๎˜ƒtheory.๎˜ƒ
๎˜ƒ๎˜ƒ
5. The๎˜ƒbond๎˜ƒorder๎˜ƒin๎˜ƒMO๎˜ƒtheory๎˜ƒis๎˜ƒanother๎˜ƒway๎˜ƒof๎˜ƒcalculating๎˜ƒthe๎˜ƒnumber๎˜ƒof๎˜ƒbonds๎˜ƒbetween๎˜ƒtwo๎˜ƒatoms๎˜ƒin๎˜ƒa๎˜ƒLewis๎˜ƒ
structure.๎˜ƒ
๎˜ƒ
6. Both๎˜ƒatomic๎˜ƒoxygen๎˜ƒand๎˜ƒdiatomic๎˜ƒoxygen๎˜ƒare๎˜ƒparamagnetic.๎˜ƒ
๎˜ƒ
๎˜ƒ
๎˜ƒ
7. The๎˜ƒmaximum๎˜ƒbond๎˜ƒorder๎˜ƒfor๎˜ƒa๎˜ƒdiatomic๎˜ƒspecies๎˜ƒis๎˜ƒ3๎˜ƒand๎˜ƒcorresponds๎˜ƒto๎˜ƒcompounds๎˜ƒwith๎˜ƒthe๎˜ƒlargest๎˜ƒbond๎˜ƒlengths๎˜ƒ
and๎˜ƒlowest๎˜ƒbond๎˜ƒenergies.๎˜ƒ
๎˜ƒ
8. ๎˜ƒThe๎˜ƒsequence๎˜ƒof๎˜ƒdiatoms๎˜ƒand๎˜ƒdiatomic๎˜ƒions:๎˜ƒO2+,๎˜ƒO2๎˜ƒ,๎˜ƒO2โ€,๎˜ƒdecreases๎˜ƒin๎˜ƒbond๎˜ƒorder.๎˜ƒ
๎˜ƒ
๎˜ƒ
9. ๎˜ƒThe๎˜ƒsequence๎˜ƒor๎˜ƒdiatoms๎˜ƒand๎˜ƒdiatomic๎˜ƒions,๎˜ƒ:๎˜ƒN2+,๎˜ƒN2๎˜ƒ,๎˜ƒN2โ€,๎˜ƒdecreases๎˜ƒin๎˜ƒbond๎˜ƒlength.๎˜ƒ
๎˜ƒ๎˜ƒ
๎˜ƒ
10. ๎˜ƒIn๎˜ƒorder๎˜ƒto๎˜ƒargue๎˜ƒfor๎˜ƒparamagnetism๎˜ƒin๎˜ƒO2,๎˜ƒyou๎˜ƒmust๎˜ƒfill๎˜ƒin๎˜ƒthe๎˜ƒcorrect๎˜ƒelectronic๎˜ƒMO๎˜ƒconfiguration๎˜ƒ๎˜ƒ(symmetrical๎˜ƒ
rather๎˜ƒthan๎˜ƒsad๎˜ƒface.)๎˜ƒ
๎˜ƒ๎˜ƒ
๎˜ƒ
pf2

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CH301 Worksheet 8โ€”Molecular Orbital Theory For each of the following statements, identify if it is true or false. If it is false, correct it to make it true.

  1. The concept of ฯƒ and ฯ€ bonds is developed for both VSEPR and MO theory.
  2. There are three homonuclear diatoms from the n=2 row that have a bond order of 0.
  3. When constructing the MO energy levels, the number of molecular orbitals is always equal to the number of atomic orbitals and is twice the number of antibonding orbitals.
  4. Hund, Pauli and Aufbau rules that were developed for electronic configurations of atoms also apply to electronic configurations in MO theory.
  5. The bond order in MO theory is another way of calculating the number of bonds between two atoms in a Lewis structure.
  6. Both atomic oxygen and diatomic oxygen are paramagnetic.
  7. The maximum bond order for a diatomic species is 3 and corresponds to compounds with the largest bond lengths and lowest bond energies.
  8. The sequence of diatoms and diatomic ions: O 2 +, O 2 , O 2 โ€, decreases in bond order.
  9. The sequence or diatoms and diatomic ions, : N 2 +, N 2 , N 2 โ€, decreases in bond length.
  10. In order to argue for paramagnetism in O 2 , you must fill in the correct electronic MO configuration (symmetrical rather than sad face.)