Shape

(Lecture id-1058)

TOPICS & OBJECTIVES

1010 - Electronic Shapes
    1010 - Know that taste depends a great deal on the three-dimensional structures of food molecules.
    1020 - Know and understand that VSEPR theory is based on electron groups that repel each other.
    1030 - Understand that VSEPR predicts five base shapes according to the number of electron groups surrounding a central atom.
    1040 - Predict electronic shape from electron pair counts: linear (2), trigonal planar (3), tetrahedral(4), trigonal bipyramidal (5), and octahedral (6).
    1050 - Sketch and name the electronic shape of a molecule from the number of electron pairs on the central atom.
 
1020 - Bond Angles
    1010 - Know the base bond angles defined by each electronic shape.
    1015 - Provide the base bond angle for each electronic shape (and two bond angles for trigonal bipyramidal).
    1017 - Explain what causes bond angle compression.
    1020 - Predict if a bond angle is compressed (less than electronic angle) or stretched, due to lone pairs or higher bond order.
    1030 - Label each unique bond angle in a structure sketch (show compression or stretching where it occurs).
 
1030 - Molecular Geometry
    1010 - Understand the difference between electron geometry and molecular geometry.
    1020 - Know how lone pair electrons on molecular geometry with respect to shape and bond angle.
    1025 - Explain why larger atoms prefer the equatorial position in trigonal bipyramical structures.
    1030 - Predict, name and draw the possible molecular geometries from each electronic geometry.
    1040 - Predict and draw the electron and molecular geometries for molecules, by predicting the geometry of each central atom.
 


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