National Chemistry Open
A 60-question multiple-choice exam covering general chemistry topics. Separate Honors and Advanced divisions.
Format
60 multiple-choice questions
Duration
110 minutes
Divisions
Honors and Advanced
Date
February 22, 2026
Ready to register?
Form below the exam details
About the Chemistry Open
The National Chemistry Open is designed to test your general chemistry knowledge. The exam covers topics typically found in a first-year chemistry course, including:
- Atomic Structures & Periodicity
- Bonding & Molecular Structures
- IMFs & States of Matter
- Stoichiometry & Solutions
- Kinetics
- Equilibrium
- Electrochemistry
- Thermodynamics
- Descriptive & Laboratory
- Organic/Biochemistry
Two Divisions
Divisions are based on your chemistry coursework. All participants take the same exam, but scores are ranked within each division separately.
For Students New to Chemistry
For students who have NOT completed and are NOT currently enrolled in AP Chemistry or equivalent courses.
Perfect for:
- Freshmen and sophomores
- Students in honors chemistry (non-AP)
- Students in regular chemistry
For AP-Level Chemistry Students
For students currently enrolled in OR who have completed AP Chemistry or equivalent courses.
Perfect for:
- Students in AP Chemistry
- IB Chemistry students (SL/HL)
- Dual enrollment / college chemistry
Awards
Division-Based Awards
Awards are determined by percentile within your division. Your recognition is based entirely on your individual performance.
Exam Formats
In-Person
Take the exam at a local chapter on February 22, 2026.
- 2:00 - 4:00 PM EST
- Eligible for official rankings and medals
- Proctored environment
Online
Take the exam online on February 22, 2026.
- 8:00 - 10:00 PM EST
- Score reports and participation certificates
- Not eligible for official rankings
Key Dates
January 12, 2026
Registration Opens
Student and host registration begins
February 8, 2026
Host Application Deadline
Last day to apply to host a site
February 15, 2026
Registration Deadline
Last day to register for Chemistry Open
February 22, 2026
Exam Day
In-person 2-4 PM EST, Online 8-10 PM EST
February 23, 2026
Results Released
Scores and awards announced, including exam questions
Register for Chemistry Open
Fill out the form below to register for the National Chemistry Open 2026.