Please submit only sites in English. Sites in other languages should be submitted to the appropriate World category.

The International Chemistry Olympiad (IChO) is an annual chemistry competition for high school students. It is one of the International Science Olympiads. Each of the more than 50 participating countries has its own national chemistry Olympiad, and sometimes there are also smaller regional chemistry Olympiads.

Chemistry is a very hands-on science. When chemical reactions can be conducted safely, then either labs or demonstrations are appropriate for educational purposes. This category is for listing such labs and demonstrations.

Please submit only websites that have English language content to this category. If your site is in a language other than English, please submit it to the appropriate category of World.

Multimedia sources designed to facilitate the teaching and learning of chemistry.

Please submit only websites that have English language content to this category and its subcategories. If your site is in a language other than English, please submit it to the appropriate category of World.

Sites created by one or more teachers with the intent of helping their chemistry students learn the material, keep up with assignments, etc.