Repo :
https://github.com/nsriram/chem_lab
Live Demo :
https://cambridge-chem-lab.onrender.com/Features :
- 23 real past papers : Feb/Mar sessions from 2021 to 2025, covering every question type students will encounter.
- Full virtual bench : choose glassware, add reagents, heat, stir, filter, and weigh, with realistic colour changes and gas observations.
- Live reaction feedback : the lab responds to what you do: indicators change colour at the endpoint, precipitates form, gases are identified.
- Measurement precision hints : get nudged when a burette reading isn't to 0.05 cm³ or a balance reading isn't to 0.01 g.
- Per-question answer boxes : type written answers alongside each question part, mirroring the Cambridge answer booklet layout. Add results tables and scatter graphs directly within each answer box.
- Free Lab mode : experiment without a set paper; great for exploring reactions and building intuition.
- Automated marking : a built-in rubric engine scores every section against the Cambridge mark scheme and gives criterion-by-criterion feedback.
- PDF report export : download a formatted report of your session including observations, answers, and scores.
- Multilingual UI : switch between English, Tamil, Hindi, Spanish, and Chinese.
- Works offline : your session is saved automatically; nothing is lost on refresh.
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The app is still in alpha and some outputs may not be accurate.
But, sharing it anyway because something like this could genuinely help students across the world. Education for all.
Contributors are welcome to add reactions, papers, and features to make it closer to a real lab.
