Year 12 · A Level Chemistry
Build good habits from the first term.
Dexter can guide you through any topic at your pace. Do questions right inside the app to build your confidence score in each topic.
Working towards your UCAS predicted grade
Ask any question, the way you want to ask it.
Dexter teaches at your pace and pitches questions at the right level. He'll show you which answers gain marks and which ones don't.
DexterWhy does 1st ionisation energy drop from magnesium to aluminium?
Good question — and this is one of the two exceptions AQA love to test.
Magnesium ends in 3s², aluminium starts in 3p¹. The 3p electron in aluminium is in a higher energy subshell than the 3s electrons in magnesium — it's slightly further from the nucleus and is partially shielded by the 3s electrons beneath it. So despite aluminium having one more proton, its outer electron is easier to remove.
The mark scheme wants three things:
- Al has its outer electron in a 3p subshell, Mg has its outer electron in a 3s subshell
- The 3p electron is at higher energy / further from the nucleus
- The 3p electron is shielded by the 3s electrons (or: the 3s subshell shields the 3p)
Put those three together and you've got full marks every time.
What you get
A tutor that has experience.
- 01
The latest interactive learning tools
There's active learning that suits YOU.
- 02
Your own study partner
Dexter tests your skills and keeps an honest track of your progress.
- 03
A study schedule that fits
Tell Dexter when your test is and what it's on, and he'll put a personal study schedule together.
Exam questions, written for you
Fresh exam-style questions on any topic, in the style of your exam board and marked instantly.
Flashcards
Quick-fire cards on any topic, made for your course, to lock in the key facts and definitions.
Molecules, drawn for you
Ask about an organic molecule and Dexter draws its structure and gives you its name.
Your course
Which course are you on?
Pick your exam board to see the Year 12 topics Dexter covers.
AQA A Level Chemistry, first year
Dexter for AQA is live now.
Everything you learn this year is examined in your three A Level papers at the end of Year 13.
Physical
- Atomic structure
- Amount of substance
- Bonding
- Energetics
- Kinetics
- Chemical equilibria
- Oxidation and reduction
Inorganic
- Periodicity
- Group 2
- Group 7
Organic
- Introduction to organic chemistry
- Alkanes
- Halogenoalkanes
- Alkenes
- Alcohols
- Organic analysis
Integrated tools
Actively learn with Dexter.
Use the latest interactive learning tools to visualise key concepts. Sign up to save and track your progress.
Atomic structure, AQA and WJEC
Ionisation energies, AQA and WJEC
Emission spectra, WJEC
Shapes of molecules, AQA and WJEC
Chemical kinetics, AQA and WJEC
Le Chatelier's principle, AQA and WJEC
Acid-base titrations, AQA and WJEC
Organic mechanisms, AQA and WJEC
Organic molecule maker, AQA and WJEC
Ion testing lab, AQA and WJEC
FAQs
Questions, answered.
I've only just started A Level. Is it too early?
No. Dexter is most useful while a topic is new: ask about what you covered in class today, and practise it the same week.
Does Dexter follow my course?
Yes. Choose AQA or WJEC and Dexter teaches to that specification and its question style, one topic at a time.
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.
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