CHEM 107 Lecture Notes - Lecture 54: Trigonal Pyramidal Molecular Geometry, Molecular Geometry, Ionic Compound
Document Summary
Ionic compounds have an electronegativity difference of 2 or greater. Covalent compounds have an electronegativity difference between 0 and 2. Covalent polar compounds have an electronegativity difference between 0. 4 and 2. ***the electronegativity difference between h and c is very low. Use a polar arrow to indicate the polarity of each bond. Rank the following bonds in order of increasing polarity. To determine overall molecular polarity, you must look at individual bonds and molecular geometry. Nonpolar: two identical polar bonds pointing in opposite directions will cancel, three identical polar bonds at 120 degrees from each other will cancel, four identical polar bonds in a tetrahedral arrangement (109. 5 degrees from each other) will cancel. Polar: two polar bonds with an angle of less than 180 between them will not cancel, three polar bonds in a trigonal pyramidal arrangement (109. 5 degrees) will not cancel. Strong attraction between h2o molecules, so h2o forms beads An example of non-covalent, intermolecular forces between water molecules.
