H2 Chemistry, marked.
StudioA is adaptive practice for SEAB 9476. Every answer comes back with the phrase that earned the mark, the clause that was missing, and the next skill to work on.
- 631
- questions
- 33
- challenges
- 13
- topics
- 123
- skills
The mark, not the mood.
Written answers are marked by a deterministic rubric, not a language model. Each point is either found in your answer or it is not, and the evidence sits beside the mark.
- Every point carries the phrase that earned it.
- Every miss names the clause that was missing.
- The model answer is revealed after you submit.
AS-08 · Ionisation energy
Explain why the first ionisation energy of magnesium is higher than that of sodium.
Magnesium has a greater nuclear charge than sodium. Aluminium's 3p electron is higher in energy and better shielded, so less energy is needed to remove it.
M2 missing — state that shielding across the period is approximately constant.
Three kinds of work. One loop.
Short recall, full written answers and a shared Paper 2/3 question. They all feed the same mastery model, so the next set is chosen from what you actually got wrong.
Multiple choice: five questions.
A short set chosen for the chapters you have marked as learned. Every option is explained and saved to your progress.
Open-ended: the full answer.
Three structured questions marked point by point against the rubric, with the phrase that earned each mark and the model answer.
Daily challenge: one shared premise.
A Paper 2/3 style question shared by every student. Parts are marked against their own rubrics and completion earns weekly leaderboard points.
One question a day.
The daily challenge is the same Paper 2/3 premise for every student, resetting at midnight in Singapore. Thirty-three sets are queued and recycled, so the question stays fresh.
- Sets in rotation
- 33
- Points
- 20–80
- Reset
- Mon
Finish the challenge to appear on the weekly leaderboard. Twenty points for completing, up to sixty more for accuracy.
Join the challenge
Your week, on one card.
Every Sunday the recap is ready: what you did, how accurate you were and whether the week moved you forward. Save it as a PNG and share it, or keep it for yourself.
- Your username and the week
- MCQ questions and open-ended questions done
- Accuracy and improvement against last week
- Points, rank, active days and streak
- The chapters you actually practised
The same recap is in the app: tap Save PNG to send it to Photos, Files or a friend.
The whole 9476 syllabus.
631 questions, 123 skills and 72 lessons across all thirteen topics. Lessons, mastery and review stay free.
- Lessons
- 72
- Skills
- 123
- Questions
- 631
- Atomic Structure
- Chemical Bonding
- The Gaseous State
- Theories of Acids and Bases
- The Periodic Table
- The Mole Concept and Stoichiometry
- Chemical Energetics
- Reaction Kinetics
- Chemical Equilibria
- Chemistry of Aqueous Solutions
- Organic Chemistry
- Electrochemistry
- Transition Elements
Practice more, or practise enough.
The free tier is a complete study tool. StudioA² removes the daily session allowance for students who want more volume.
Free
S$0
Everything you need to run the loop every day.
- 3 MCQ sessions a day
- 1 open-ended session a day
- The daily challenge and weekly leaderboard
- All 72 lessons, review and progress
StudioA²
S$5/month
Unlimited practice for the weeks that need it.
- Unlimited MCQ sessions
- Unlimited open-ended sessions
- Everything in Free, unchanged
- Cancel anytime
Questions, answered.
Is this AI marking?
No. Written answers are marked by a deterministic rubric matcher. Each point is either present in your answer or it is not, and the evidence is shown beside the mark. The same answer always receives the same score.
Which syllabus does it follow?
SEAB 9476 H2 Chemistry. All 13 topics are mapped, with 631 questions, 123 skills and 72 lessons across the syllabus.
What does it cost?
The free tier gives you three MCQ sessions and one open-ended session a day, plus the daily challenge, lessons, review and progress. StudioA² is S$5.00 per month for unlimited practice. Cancel anytime.
How does the daily challenge work?
Every student gets the same challenging question each day. It resets at midnight Singapore time, and finishing it earns 20 points plus up to 60 more for accuracy. The leaderboard resets every Monday.
Does it work on my phone?
Yes. The practice, marking, leaderboard and weekly recap are designed for a phone browser. The weekly recap can be saved as a PNG and shared.
Are the questions original?
Yes. The question bank is written for StudioA. School notes and past papers are never uploaded, and the questions are checked against the syllabus and data booklet.
Bring your script.
Start with one marked answer. The next step is chosen from what you get wrong.