Misplaced modifiers can cause both confusion and laughter on the part of a reader. You probably want to avoid either response, so use this site to learn what misplaced and dangling modifiers are, as well as how to avoid them in your writing. The site also offers two exercises and a post test. While the explanations and examples on the site would be useful for mid- to upper elementary students, the exercises and test are more suited to high school.

This multimedia site is full of useful features, from a video introduction to the purpose of the site, to notes on the text and a reading in Middle English. Information about the background, language and other details are also included.

The ideal gas law is stated and explained at this site from the Towson University. It is then used to derive the other gas laws (Charles, Boyle's, Gay-Lussac's, Avogadro's, combined, etc.). Other gas law relationships are discussed. Sample problems illustrating the use of each gas law to solve problems are provided. Real gases and Van der Waals equation are also discussed.