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Choose your exam and compete against chemistry students nationwide. Both exams are 100% free.
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February 22, 2026
Chemistry Open
General chemistry with Honors & Advanced divisions.
- 60 multiple-choice questions
- 110 minutes
- Honors & Advanced divisions
- Based on coursework level
Recommended for most students
Register for Chemistry OpenAdvanced
March 21, 2026
Chemistry Challenge
Our advanced exam for students with strong chemistry backgrounds.
- 60 or 72 questions (by division)
- 90 minutes
- Standard & Elite divisions
- Self-selected challenge level
For students with college-level chemistry backgrounds
Register for Chemistry ChallengeCan I register for both exams?
Yes! Many students take both. Chemistry Open is in February and serves as great practice for the more advanced Chemistry Challenge in March. Register for each exam separately.