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.
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. Chem Help links to official College Board pages; it does not reproduce copyrighted AP exam questions.