Seventy percent of the air pollution in China is due to car exhaust. Under the umbrella of environmental chemistry, learners extensively explore air pollution. From the makeup of our atmosphere to sources of major air pollutants, classes...

Discover all the elements and chemical compounds that are found in the air. They are presented in a chart listing their symbols, molecular weights, and what percent of the atmosphere they each comprise. A set of facts is also provided.

This site presents as explanation for calculating empirical formulas from composition data. Numerous examples are given, along with practice problems.

This site explores the classification of igneous rocks. Content addresses classification based on color and texture, mineral composition, and chemical composition.

Explanation of how to calculate empirical and molecular formulas.