Resource provides the ten signs that tell when a chemical change has occured. Each sign has a detailed explanation.

Online textbook reviews fundamentals of chemistry and physical science via slideshow presentations, notes, and videos. Materials for classroom activities engage students in inquiry-based, hands-on investigations covering molecular...

Online textbook reviews fundamentals of chemistry and physical science via slideshow presentations, notes, and videos. Materials for classroom activities engage students in inquiry-based, hands-on investigations covering molecular...

Learn to identify changes in matter and explain what happens as matter changes. The lesson is supplemented with several experiments to reinforce key concepts.

Identify chemical and physical changes and the differences between the two.

Our understanding about the air we breathe has changed dramatically through time. This illustrated timeline from the NOVA Web site tracks the changing thought on air and the creation of the Periodic Table of the Elements.

A series of interactive applets use scientific models to teach some basic concepts of matter, including states of matter and physical and chemical changes.

Search from over two thousand chemistry resources for students. Options allow user to refine search to pinpoint the exact resource needed. Includes presentations, videos, worksheets, quizzes, experiments, games, tutorials, and more.

Search from over two thousand chemistry resources for teachers. Options allow user to refine search to pinpoint the exact resource needed. Includes presentations, videos, worksheets, quizzes, experiments, games, tutorials, and more.