I can move about freely, but you cannot. The class models the movement through cell membranes by way of passive and active transport. Members of the class play the roles of various proteins, atoms, compounds, and cell actions and mimic...

The liquids did not mix — so what do density columns have to do with it? The seventh part in a series of nine provides the theoretical explanation of why density columns do not mix. The lesson plan covers the topics related to...

Sixty multiple choice questions cover the entire gamut of chemistry concepts. This is the local section of the U.S. National Chemistry Olympiad, where your chemistry candidates take a shot at entering the national competition. They...

In this chemistry learning exercise, test takers answer 60 multiple choice questions on topics related to chemistry from balancing equations to calculating moles and molecules of compounds. They name formulas, they convert, they solve...

A variety of topics including reaction rates, combustion reactions, periodic trends, and ionization reactions are included in this exam. Test takers also practice calculating empirical and molecular formulas of compounds.

This simulation explores the relationship between mass, moles, molecules and atoms. Select one of the 6 compounds, set the mass of the compound, and release the scrollbar to calculate.

Take an interactive quiz over organic compounds. After completing the quiz, check your score, and then revisit any incorrect question for further review.

Take an interactive quiz over carbohydrates. After completing the quiz, check your score, and then revisit any incorrect question for further review

A twenty-question multiple-choice exercise about chemical formulas. Quiz gives immediate feedback with the correct answer.