2020/21 Update: the 2021 Cambridge Chemistry Challenge is due to take place in June or July 2021. Please bear with us while we make some changes to the website.
As a teacher, you will be able to register until Friday, June 4th, and the competition window will open on June 8th and run until June 25th, when the markscheme will be published. You will then have until June 30th to enter the marks. We are hoping to moderate the highest-scoring scripts and to invite the Roentgenium winners to one of the courses to be held in Cambridge in late August/early September.
After five successful years of online challenges, there are 180 puzzles that are available to students and teachers. The entry level question for one of the challenges, chosen at random, is shown above. The other challenges can be found by clicking "The Online Challenge" panel below. We hope you have enjoyed the challenges as they came out, however, there are no plans to release new puzzles.