Meet Dexter.
The A Level Chemistry tutor that knows you.
Trained on 21 years of A Level Chemistry teaching. Built and run by a real teacher, Rich Warburton, who still teaches A Level Chemistry every day.
- AQA
- WJEC
- Matched to your specification
14 days free. Full membership is £49 a month.
Teach me how electrophilic addition works
Electrophilic addition is the key alkene reaction — and once you've got the mechanism, all five versions of it follow the same pattern.
Coaching session with Rich
Hund's rule
Electron configuration
Coaching session with Rich
Ions and noble gases
Filling orderA look inside: Rich's weekly coaching sessions, Dexter's animated explanations and the exam tools.
- 21 yearsExperience you can trust
- AQA and WJECDexter matched to your specification
- 14 free toolsRich's interactive tools, no login
- 24/7Ask Dexter whenever you're working
Why students stay with Dexter.
Always accurate
Unlike other A.I. resources, Dexter will never stray from your specification. You get exam board specific explanations, advice & questions
DexterTeach me how electrophilic addition works
Electrophilic addition is the key alkene reaction — and once you've got the mechanism, all five versions of it follow the same pattern.
The big idea: the C=C double bond has a region of high electron density above and below the carbon atoms. Electrophiles — electron-hungry species — are attracted to that. The π bond breaks, both electrons go to the electrophile, and a new bond forms on the other carbon.
Here's the mechanism for the simplest case — ethene + HBr:
A real reply from Dexter, word for word
Always there
Dexter is there to help you when YOU need it. Plus access weekly coaching sessions with Rich (the brains behind it all)
Always remembers
The more you use Dexter, the more helpful he becomes. He learns your strengths & weaknesses uses them to guide your studies
Everything a tutor can do.
Plus everything a tutor can't.
Dexter provides real teaching, A* resources & unlimited exam question practice.
A tutor that remembers
Dexter recalls what you covered, where you got stuck, and what's coming up, so every session starts where the last one ended.
Dexter, on demand
Ask anything, any time. Dexter teaches the way Rich teaches: step by step, spec-exact, and never just handing over the answer.
Unlimited exam questions
Fresh exam-style questions on any topic, created in the style of your exam board and marked instantly. Not just a "question bank".
Honest progress tracking
Your readiness scores come from real evidence (questions you actually got right), not vibes. You'll know exactly what to work on next.
Dexter's readiness molecule: each exam paper is a 3D molecule, and each topic is an atom that grows and glows as you get readier.Weekly coaching sessions with Rich
Real lessons from a real teacher: big topics, exam technique, and revision strategy. Submit a question any time.
Study scheduler
Tell Dexter when your test / exam is and what it's on and he'll put a personal study schedule together.
Get interactive.
Rich's interactive tools for AQA and WJEC. Build an atom, rotate molecules in 3D, watch an equilibrium shift and see a pH curve form. No login needed.
Best on a laptop, desktop or iPad. The tools are not designed for phone screens.
Pick a tool
Builds any atom from H to Kr, with its protons, neutrons, electron shells and electrons-in-boxes diagram. Shows the shapes of s and p orbitals.
Open the tool (opens in a new tab)
Built by a real teacher, not a tech company.
“I built Chemistry Coach (Dexter) to make expert tutoring, advice and resources more accessible. Generic A.I. makes mistakes and assumptions that can lead students astray. Dexter has one job…. to teach chemistry.
Every response, every question and every piece of advice is true to my teaching style. A style that has helped thousands of students achieve their grade potential. Crucially Dexter gets to know the student which can have a real impact on learning”
Rich Warburton, Head of Chemistry, 21 years teaching this exact course
More powerful than a tutor, at a fraction of the cost.
£49 a month
Start with 14 days free: up to 120 messages with Dexter, and your profile stays even after the trial ends.
- Full access to all resources
- Continue to build your A Level Chemistry profile with Dexter
- Weekly live coaching sessions with Rich
- Cancel any time, no lock-in
*Fair usage policy applies
Questions, answered.
Which exam boards does Dexter cover?
AQA and WJEC A Level Chemistry. Dexter teaches to your board's specification and question style.
Does Dexter just give answers?
No. He teaches step by step and asks you questions, so you understand it well enough to do it yourself in the exam.
What happens when the trial ends?
Nothing is charged, because we never took a card. Your profile stays, and you can join whenever you're ready.
Can I cancel?
Yes, any time. There is no lock-in.
How is my data kept safe?
All data is secure and private to the student. Chemistry Coach never sells student data or shares it for marketing.