Lesson 9: Objectives
PURPOSE:
To become familiar with shapes and polarities of molecular materials; with van der Waals, dipole-dipole, ion-dipole and hydrogen bonding; and with the relationship between these and several physical properties.
OBJECTIVES: You have completed this lesson when you can:
1. Describe the relationship between the bond type for a particular chemical and physical properties such as state of matter at room temperature, melting point, boiling point, and miscibility with other chemicals (water in particular).
2. Describe the nature of dipole-dipole bonding and explain why it is associated with polar molecules.
3. Describe the nature of hydrogen bonding and explain what conditions must exist within a molecule for it to occur.
4. Describe the nature of van der Waals bonding and explain why it is associated with nonpolar molecules.
5. Compare the strengths of intermolecular bond types to one another and to interatomic bonds. Compare specific chemicals to one another based on bond strength.
6. For simple molecular elements and compounds, determine the shape of the molecules.
7. Distinguish between bond polarity and molecular polarity.
8. For molecular elements and compounds, which are simple or moderately complex in shape, determine whether the molecules are polar or nonpolar.
9. From the formulas of chemicals determine which type of intermolecular bonding (if any) is used by the chemicals.
10. Given a particular chemical, determine what type of bonding is responsible for its state at room temperature, melting point, boiling point, and miscibility with other chemicals.
11. Describe the nature of ion-dipole bonding and the conditions under which it occurs.
ASSIGNMENTS:
Outside Reading (optional): Find and read the sections in your text that deal with the following topics:
- molecular shapes
- molecular polarity
- van der Waals bonding
- dipole-dipole bonding
- hydrogen bonding
- ion-dipole bonding
To be turned in -
Lab Worksheet (Ex. 15 in your workbook)