Journal Entry:

 Hydrogen chloride, HCl, and ammonia, NH_3, have a smell, and large amounts of each dissolve in water. Oxygen, O₂, nitrogen, N₂, and methane, CH4, do not have a smell and only a small amount of each dissolves in water. How can you explain these differences?

Learning Intentions

• We will assess a molecule for symmetry and determine if it is likely to be polar.

• We will use electronegativity values to locate the partial negative and partial positive portions of a molecule.

• We will explain the connection between polarity and smell.

Closing Task:

 You can determine if a molecule is polar and if it will have a smell.

Content Standards being covered: