This interactive site gives a great overview of equation stoichiometry and conversion between masses of substances. Gives detailed steps to follow for equation stoichiometry and a overall summary of how to do the conversions.

Did you ever wonder how or why atoms bond together? This interactive tutorial sheds some light on why bonds form and the difference between ionic and covalent bonds.

This digital textbook covers core physical science concepts and includes interactive features, real world examples, and videos.

An introduction to elements, which explains how they cannot be broken down into smaller substances. Interactive tutorial takes you through the different elements in the periodic table.

Learn how to classify matter into elements, compounds, and mixtures while watching this interactive lesson. Listen to the explanation while you discover how to differentiate between different types of matter.

This digital textbook covers core chemistry concepts and includes interactive features, real-world examples, and videos.

[Free Registration/Login may be required to access all resource tools.] A complete, web-based textbook covering a wide range of middle school concepts in Physical Science.