2024 High School Chemistry Olympiad

The National Exam for the 2024 High School Chemistry Olympiad will be held on April 20 at Cal State University Dominguez Hills. All qualified students will be notified.



USNCO has informed all local sections of new registration changes for the 2024 USNCO Exam. This year all students must register ONLINE at the ACS website via the link below in order to participate in the local exams. If students have not registered with USNCO by the January 26, 2024 deadline, they will not be able to participate in the local exam.
  1. 2024 USNCO Rules & Eligibility 2024 – You must read the 2024 Rules and Eligibility before you sign up.
  2. Register is now closed. Deadline to register: January 26, 2024
    NOTE: When completing the registration form, there are multiple California sections. SCALACS is listed as “Southern California” on the dropdown menu. Choose this option.
  3. Once the registration closes on January 26, 2024, SCALACS will receive the list of registered participants from USNCO.
  4. SCALACS  will then reach out to all teachers with students who are registered.
    *If there are multiple teachers at the same school, SCALACS will reach out to these teachers in a group e-mail so that we are all on the same page and we can determine which teacher will proctor the local exam.
    *Please let SCALACS know if your school would be willing to accept students who do not have a testing site.
    *SCALACS will provide the list of students and students’ information to the teachers.
  5. There will be no Scantrons this year. SCALACS will be sending each school the printed exams along with the new bubble answer sheet for students to use.
  6. USNCO will be handling all the scoring of the exam. Once the exam is over, teachers can either scan all the bubble answer sheets in (1) PDF file and e-mail them to SCALACS office at office@scalacs.org or mail them to the office at 2700 E. Foothill Blvd, Suite 209, Pasadena, CA 91107. The office administrator will scan them and submit them to USNCO.<
  7. Exam Payment — SCALACS will send an invoice to the teachers of the participating students. All payments must be received by March 1, 2024.

Any questions, please contact our administrator, e-mail office@scalacs.org or call 310-327-1216.


October 2023 Online Form open to all eligible participants
January 2024 Friday, January 26– Completion of this form by all eligible participants
January 2024 Friday, January 31 – Confirmation of participation sent to participants from local coordinators
Wednesday, March 13  –  SCALACS Exam testing
Thursday, March 14 –  SCALACS Exam testing
Monday, March 25 – Deadline for Local Sections to submit LSE answer sheets to ACS National
April 2024 Monday, April 1 – Deadline for ACS National to share scores with Local Sections
Friday, April 5 – Deadline for National Exam nominees to ACS National
Saturday, April 13 – First day of National Exam testing window
Sunday, April 21 – Final day of National Exam testing window
Monday, April 29 – Study Camp participants notified
June 2024 Sunday, June 2– First day of Study Camp  (tentative)
Saturday, June 15 – Last day of Study Camp (tentative)
July 2024 Sunday, July 21 – First day of IChO in Riyadh, Saudi Arabia
Wednesday, July 31 – Last day of IChO