CK-12 Foundation
Ck 12: Hydrocarbon Rings
[Free Registration/Login may be required to access all resource tools.] In this module, students will explore cyclic hydrocarbons, and explain how ring strain contributes to the shape of cyclic hydrocarbons. They will also name and write...
Other
University of Wisconsin: Cycloalkane Conformation
Comparison of straight chained and cycloalkanes. Bond angles of a variety of structures presented. Equatorial and axial positions shown. Plug-ins required for interactive illustrations.
US Environmental Protection Agency
Epa: Chemicals in the Environment
Information summaries on some chemicals and descriptions of how you might be exposed to these chemicals, how that exposure might affect the environment, etc. Please note that this type of information changes rapidly.
McGraw Hill
Oregon State University: Alkanes and Cycloalkanes
This site is from the Organic Chemistry Online Learning Center and provides useful information on both Alkanes and Cycloalkanes. The information is not too in-depth, but a background knowledge of the subject would definitely be helpful.