Learn by concept
Use unit guides and lessons to build the reasoning behind the chemistry—not just memorize a procedure.
About Chem Help
Chem Help is a free, independent learning platform for high school chemistry. It is built to make studying more useful: clear explanations, purposeful practice, and a better sense of what to work on next.
What you can do here
Practice with purpose
Work through questions and practice sets, then use explanations to understand what changed and why.
Find your next step
Use the diagnostic and learning progress tools to identify the topics worth revisiting next.
How Chem Help is designed
Chemistry is easier to retain when each answer has a reason behind it. Chem Help pairs questions with explanations so practice can help you understand a concept instead of only checking an answer.
The site is organized for everyday classwork as well as AP Chemistry review. You can study by unit, build focused practice, and use AP-style free-response practice when you are ready to write out your reasoning.
Scientifically Reviewed and Mentor-Guided
Chem Help has been developed with guidance and scientific review from qualified professionals. The platform combines this expert oversight with ongoing content verification, student feedback, and continuous improvements to make chemistry learning accurate, accessible, and valuable.
This oversight includes scientific review and guidance from Benjamin’s research mentor. Reviews of individual lessons, questions, and simulators are recorded separately, with their scope and supporting documentation. Platform-level oversight does not mean every item has been personally reviewed.
Review information updated . Item-level checks also include AI-assisted work and automated answer validation.
- Subject-matter review
- Targeted chemistry checks examine terminology, assumptions, calculations, and explanations against references. Documented reviews cover the five ICE-table exercises (October 11) and the 13 supported VSEPR shapes (October 16, 2026).
- Answer validation
- Automated tests check numerical answers, accepted alternatives, units, and known incorrect responses in covered exercises. Passing tests does not establish that every question is accurate or unambiguous.
- Source attribution
- The October 11, 2026 provenance audit checked lesson source records and flagged missing evidence and license conflicts. Some source versions and reuse rights remain unresolved. See Sources and Licensing.
- Student-reported corrections
- Reports enter the correction queue. Include the page or question ID and what seems wrong; name and email are optional. A report is not confirmation that an issue has been fixed.
Student-first by default
You can explore Chem Help without creating an account. Practice progress and preferences stay in your browser on the device you use, so you can return to your work without making a profile.
AP Chemistry note
Chem Help is an independent educational project and is not affiliated with or endorsed by College Board. AP and Advanced Placement are trademarks registered by the College Board, which does not sponsor or endorse this site. For official AP exam questions and scoring guidelines, follow the links to College Board.