» Unit 12 – Attractive Forces explore. more.

LEARNING OBJECTIVES

Show how a model of varying distribution of valence electrons in covalently bonded molecules can account for attractive forces between molecules.
- Represent distributions of electrons in various simple molecules.
- Use this model to account for the relationship between the strength of London forces and size in non-polar molecules.
- Use this model to account for the strength of dipole-dipole interactions between polar molecules.

Account for differences in physical properties (such as m.p. and b.p.) in terms of intermolecular forces of attraction.
Distinguish between attractions (between molecules) and bonds (within molecules).
Describe the conditions under which hydrogen bonds can form between (and within) molecules.
Use the concept of hydrogen bonding to explain some of the properties of water.
Describe the role attractive forces between molecules play in the miscibility of various liquids and the solubility of solids in water.
Describe the dispersion of oil by soaps, detergents and the lipids in egg yolks in terms of intermolecular attractions.
Differentiate and explain the properties of saturated and unsaturated fats and their impact in nutrition.
Explain how important bio-molecules can be built by the polymerization of simpler molecules containing various functional groups.
Explain the role intermolecular attractions play in the structure and function of such bio-molecules as proteins, polysaccharides, nucleic acids, and phospholipid bilayers.