Prepare for Exams

Links to annotated files are included next to the corresponding exam below. Detailed solutions are provided directly in the files for National Exam Parts 2 and 3.

Local Chemistry Olympiad Exams

National Chemistry Olympiad Exams

Detailed solutions are provided directly in the files for National Exam Parts 2 and 3.

To suggest corrections to past solutions, please submit them in the USNCO Preparation Hub.

Solutions are kindly annotated by our volunteers, view all acknowledgments. Sign up as a volunteer to annotate past exams.

USNCO Preparation Hub

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This forum is open to anyone interested in USNCO. Share your favorite resources, ask questions of our volunteers, or share comments/suggestions for annotated solution guides in the relevant forums. You only need an ACS ID to login and join the conversation (a member number is not required).

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Get extra help with a USNCO Coach

The USNCO Coaching program helps high school students improve their chemistry skills and become more competitive for the U.S. National Chemistry Olympiad. Students receive extra help during 2-hour sessions for small groups, led by coaches from across the U.S. Coaching sessions are organized over Zoom and coordinated by the American Chemical Society.

Coaching sessions will last for two hours on Fridays every other week in January and February of each year. At each session 30 minute tutorials are be followed by 1 hour and 30 minutes of small group work in breakout room.

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