Bellwork # What is electronegativity?

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Presentation transcript:

Bellwork #4 10-15-2015 What is electronegativity? The range of electronegativities for bonds is: Ionic _____ to ______ Polar Covalent ______ to ______ Nonpolar Covalent ______ to ______ A molecule that is not symmetrical would be classified as what kind of molecule? Name and draw the lewis structure for SO2 and describe the polarity of the bonds and the molecule.

Bellwork #4 10-15-2015 Please put your take-home quiz on the front bench! Pick up a Shape Name Inquiry from the bench! What does VSEPR stand for? What is VSPER Theory? How do you think electrons are responsible for the shape of a molecule?

Chemical Bonding: Molecular Geometry

What is molecular geometry? How is molecular geometry determined?

For Ionic Compounds

Crystalline Lattice (Ionic Compounds)

For Covalent Molecules VSEPR Theory is the idea that electron groups repel one another. V = Valence S = Shell E = Electron P = Pair R = Repulsion

What is an electron group? An electron group can be defined as a lone pair, single bond, double bond, or triple bond.

Valence shell electron pair repulsion (VSEPR) model: Predict the geometry of the molecule from the electrostatic repulsions between the electron (bonding and nonbonding) pairs. # of Electron Groups on central atom # of Bonding Groups around central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry linear B 2 2 linear B B

Example of LINEAR Molecular Geometry 0 lone pairs on central atom Cl Be 2 electron groups on central atom

VSEPR trigonal planar trigonal planar 3 3 1 Trigonal planar 3 2 Bent # of Electron Groups # of Bonding Groups around central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry trigonal planar trigonal planar 3 3 1 Trigonal planar 3 2 Bent Lone pair of electrons repels the electrons in the bond and pushes them down. S O O

Example of TRIGONAL PLANAR Molecular Geometry Formalydehyde (CH2O)

VSEPR tetrahedral tetrahedral 4 4 4 3 1 tetrahedral trigonal pyramidal # of Electron Groups # of Bonding Groups around central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry tetrahedral tetrahedral 4 4 4 3 1 tetrahedral trigonal pyramidal 4 2 2 tetrahedral bent

bonding-pair vs. bonding pair repulsion lone-pair vs. lone pair repulsion lone-pair vs. bonding <

Predicting Molecular Geometry Draw Lewis structure for molecule. Count number of electron groups on the central atom. Compare the bonding groups to the lone pairs. Use VSEPR to predict the geometry of the molecule. What are the molecular geometries of SO2 and SO3? S O S O Trigonal Planar Bent