CHEM 1A Lecture Notes - Lecture 11: Valence Bond Theory, Antibonding Molecular Orbital, Pi Bond

101 views6 pages

blushmammoth506

30 Nov 2016

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

abdullah32 and 38285 others unlocked

CHEM 1A Full Course Notes

Verified Note

44 documents

Document Summary

Determining hybridization: draw the lewis structure, predict electron geometry using vsepr, hybridization state of central atom corresponds to the number of electron pairs: Example: determine the hybridization of the central atom and deduce the geometry of pf3. Hybridization state of central atom corresponds to number of electron pairs. # hybrid orbitals = # of electron pairs. Use valence bond theory to describe the types of bonds and orbitals in acetone (ch3)2co. Valence bond theory explains chemical bonding qualitatively, assuming that electrons occupy atomic orbitals. Atomic wavefunctions can combine in an additive way and in a subtractive way. Antibonding orbital is higher in energy than the bonding orbital. The two atomic s-electrons form an electron pair in the lowest energy mo (bonding) Formation of pi mos from atomic p orbitals. The bond in the following molecules are sigma bonds formed by combining two 1s atomic orbitals. The bond order is a measure of stability of the chemical bond.

Related Questions

Draw the Lewis structure for carbonyl fluoride, COF₂. What are the electron-pair geometry and molecular geometry around the central atom? What is the hybridization of the carbon atom? What orbitals overlap to form the and bonds between carbon and oxygen?

lavenderfish269

rubycrab39

Use valence bond theory to describe the bonding and geometry in theSeF4 molecule.

A. The central atom is Se, which has five electron groups around it(four bonding pairs and one nonbonding/lone pair). Theelectron-group geometry is trigonal bipyramidal (and the moleculargeometry is see-saw). To facilitate this geometry, the Se atom'sorbitals are hybridized as sp3d orbitals. Four of these hybridorbitals contain one of Se's 6 valence electrons each, and thesehybrid orbitals overlap with unhybridized p orbitals of the four Fatoms. The fifth hybrid orbital of Se contains a lone pair ofelectrons. There are 4 sigma bonds and 0 pi bonds in thismolecule.
B. The central atom is Se, which has six electron groups around it.The electron-group geometry is octahedral. To facilitate thisgeometry, the Se atom's orbitals are hybridized as sp3d2 orbitals.Four of these hybrid orbitals contain one of Se's 6 valenceelectrons each, and these hybrid orbitals overlap with unhybridizedp orbitals of the four F atoms. The fifth and sixth hybrid orbitalsof Se contain lone pairs of electrons. There are 4 sigma bonds and0 pi bonds in this molecule.
C. The central atom is Se, which has four electron groups aroundit. The electron-group geometry is tetrahedral. To facilitate thisgeometry, the Se atom's orbitals are hybridized as sp3 orbitals.These hybrid orbitals overlap with unhybridized p orbitals of thefour F atoms. There are 4 sigma bonds and 0 pi bonds in thismolecule.
D. The central atom is Se, which has four electron groups aroundit, two single bonds and two double bonds. The electron-groupgeometry is tetrahedral. To facilitate this geometry, the Se atom'sorbitals are hybridized as sp3 orbitals. These hybrid orbitalscontain one electron each of Se's 6 valence electrons, and thesehybrid orbitals overlap with unhybridized p orbitals of the four Fatoms. The final 2 electrons of Se's 6 valence electrons reside inunhybridized p orbitals, which overlap with unhybridized p orbitalsof the F atoms. There are 4 sigma bonds and 2 pi bonds in thismolecule.

CHEM 1A Lecture Notes - Lecture 11: Valence Bond Theory, Antibonding Molecular Orbital, Pi Bond

CHEM 1A Full Course Notes

Document Summary

Get access

Related textbook solutions

Chemistry: Structure and Properties

Basic Chemistry

Principles of Chemistry Molecular Approach

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related Documents

CHEM 1A Lecture Notes - Lecture 9: Ab3, Trigonal Pyramidal Molecular Geometry, Ab4

CHEM 1A Chapter Notes - Chapter 5: Ionic Compound, Ionic Bonding, Lattice Energy

Related Questions