CK-12 Foundation
Ck 12: Chemistry: Empirical Formula
[Free Registration/Login may be required to access all resource tools.] Covers empirical formula.
Concord Consortium
What Happens to the Energy of Water Molecules During Hurricanes?
How does energy charge when evaporation is reversed? and What powers a hurricane? are explored in this module.
University of Massachusetts
University of Massachusetts: Rasmol & Chime
This site from the University of Massachusetts links to downloadable freeware (Rasmol and CHIME) which are required to view 3-D images common on organic chemistry tutorials.
Other
University of South Carolina: Molecular Formula
A brief explanation of the relationship between molecular formula and empirical formula.
Science Struck
Science Struck: Molecular Compounds
Explains what a molecular compound is, how they are named, their properties, and the difference between ionic and molecular compounds. Includes a list of molecular compounds.