Students learn how to find percentage composition, the percentage of a formula mass represented by each element. Percentage composition compares the mass of one part of a substance to the mass of the whole.

Tutorial relates to effusion. Students will conduct an experiment to determine the molecular weight of an unknown gas.

A truly complete biography of the great man. Some adequate discussion of his theoretical and scientific work, but the accent here is on his personal life. Many anecdotes, many quotes from him, many references and hotlinks to other...

This FAQ site over general chemistry concepts presents the question: "Why are moles used?" It explains what moles are and how they can be used to count molecules and how grams can be turned into moles.

Online access to portions of Einstein's original papers and manuscripts.

Learn about density in this hands-on science experiment. Includes full list of materials, procedures, and scientific explanation of what makes an object float or sink. [PDF]

This online textbook chapter provides learners with advanced-level reading and practice material on stoichiometry

A very complete list of terms that are important to the study of gases. This resource is a web archive.

This site provides a great overview of stoichiometry, the part of chemistry that studies amounts of substances that are involved in reactions. Content focuses on what you measure, and includes two examples.

Participate in the investigation of a virtual crime scene using chemistry concepts to solve a mysterious death. The 40-50 minute activity can be used as a classroom lab or as a homework assignment. Additionally, teachers may request a...

[Free Registration/Login Required] An informational text about how cooking causes changes in matter. A question sheet is available to help students build skills in reading comprehension.