CHEM 6A Chapter Notes - Chapter 8: Electronegativity, Stereospecificity, Steric Number

• School: UCSD
• Department: Chemistry and Biochemistry
• Course: CHEM 6A
• Professor: Tin Yiu Lam

Document Summary

8. 1 lewis formulas do not give us the shape of molecules. Lewis formula show bonding relationship among atoms in a molecule does not show shape or geometrical arrangement of the nuclei. Stereoisomers: atoms to atom bonding but different spatial arrangements of the atoms. Different molecular species different chemical and physical properties. Two stereoisomers of dichloromethane molecule have never been observed. Tetrahedron: four sided figure that has four equivalent vertices and four identical faces. 8. 2 all four vertices of a regular tetrahedron are equivalent. Space filling molecular models: fair representations of angles between bonds and of relative sizes of the atoms in molecules. Ball and stick molecular model: easier for geometry. Tetravalent: carbon atom that is bonded to four other atoms. Structural chemistry: shapes and sizes of molecules are studied. 8. 3 valence shell electron pair repulsion theory is used to predict the shapes of molecules.