Problems written by the American Chemical Society - one of the World's leading science communities

16000+ Students are taking the same paper each year

Beneficial for applying to top science universities

Outstanding students will have the chance to attend top science programs


The US National Chemistry Olympiad (USNCO) program is a chemistry competition for high school students. The purpose of the competition is to stimulate young people to achieve excellence in chemistry.

The American Chemical Society has sponsored the program since 1984. The US National Chemistry Competition is a multi-tiered chemistry competition. The top four American students of the national competition represent the United States in the annual International Chemistry Olympiad.

American Chemical Society has authorized ASDAN China (ASDAN Academy) to use the same paper of USNCO of the same year so that Chinese students can compete on the same challenges to test their Chemistry learning. Chinese nationalities won’t able to continue for the selection of US National Team.

* US passport or Green Card holders are eligible to proceed to US national team selection. If you hope to have this chance, please make sure that you choose the Shanghai ACS US students Exam Center before January 8th 2020.

Competition Rules




Individual written test (no experiments)


60 multiple-choice questions

Exam locations

Exam Centers across China (check and choose exam center after registration)

National awards:

  • Gold: Top 10%
  • Silver: Top 20%
  • Bronze: Top 35%
  • Regional Honorable award: Regional top 15%

Note: American students ranked within the region. No global ranking available.

Academic materials

Past 20 years Problems and solutions available



Includes exam, grading, post and certificate fee and past papers fee (ASDAN doesn't provide any trainings)

Qualifying Students

High school students

Pre-registration deadline

23rd March, 2020

Exam Centers

Sample Problems


1. Can the students bring a calculator to US National Chemistry Competition?

Students can bring a basic calculator (without any equation editor and program functions).

2. Can the students bring a dictionary to US National Chemistry Competition?

The students can bring a printed version dictionary.

3.Are there any past exam papers or other studying materials?
Access to past exam papers will be provided after registering for PhysicsBowl.
4. Refund policy
If, for some reason, the student is unable to attend after paying the fee, please contact us. If you apply before the registration deadline, 25% of the registration fee will be deducted as academic materials and service fees. If you apply after the registration deadline, no refund will be given.