Molecular Geometry Lab Linear shapes tend to be non polar if the same elements are combined. Linear shapes are polar if 2 different elements are combined. Pyramidal shapes are usually polar Bent shapes are polar Tetrahedral shapes are polar if not symmetrical, nonpolar if symmetrical Construct each of the following: FORMULA NAME # bonded pairs H2 Hydrogen H20 Water CH4 Methane Cl2 Chlorine NH3 Ammonia HF Hydrogen Fluoride # nonbonded pairs Shape Polarity Ball and Stick Sketch Lewis Dot Structure FORMULA NAME N2 Nitrogen CO2 Carbon Dioxide H2O2 Hydrogen Peroxide O2 Oxygen H2S Hydrogen Sulfide # bonded pairs # nonbonded pairs Shape Polarity Ball and Stick Sketch 1. Which molecules are non polar because all BONDS are non polar? 2. Which molecules have polar bonds but are non polar because of symmetry? 3. Why do we not represent ionic compounds with ball and stick models? 4. How does building molecular models help to determine the shape and polarity of the molecule? Lewis Dot Structure