Refer to the safety instructions given with each individual activity.Refer to the materials list given with each individual activity.Lesson: 8-12 class periods, depending on class level. Teacher Preparation: See individual resources. This unit supports students’ understanding of Recognize that physical properties are related to intermolecular forces.
Identify the intermolecular forces present in chemical substances.Manipulate models to demonstrate molecular orientations giving rise to London dispersion forces, dipole-dipole forces and hydrogen bonds.Rank molecules in order of increasing strength of van der Waals forces, given a set of structural formulas for several compounds.Describe the unique behaviors of water molecules, and why they are important.Explain the meaning of the following: cohesion, adhesion, surface tension, and capillary action.Relate the shape of a molecule and the relative electronegativity values of its constituent atoms to the polarity of the molecule.