IB Chemistry IA Grader

Grade your Chemistry IA before you submit. Upload your draft and get a mark for each criterion, comments tied to your sentences, and a list of what to fix first.

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5 free gradings a month. No card. Private to you.

Chemistry IA mark and criterion feedback in Marksy

93%

of Marksy's marks on Chemistry IAs land within one grade of the IB's final mark

Tested on 162 Chemistry IAs the IB had already marked. See how we tested

Marks
24, from four criteria worth 6 each
Length
3,000 words at most
Share of your grade
20%, at SL and HL
SL and HL
Same task, same criteria

See the mark, and the sentences behind it

Check the quality of your method, analysis, evaluation, communication and subject-specific reasoning. Find the weakest parts of the draft and see what to change first.

Chemistry IA: comments on your writing
Comments on your writingEach comment points at a passage in your draft, so you can see why Marksy said it.
Chemistry IA: what to fix first
What to fix firstA short list of edits in order, instead of changing random parts of the draft.

What Marksy checks for each Chemistry IA criterion

You get a mark for each IB assessment criterion below. The points under each one are what Marksy looks for in your draft. See the mark bands

Criterion A: Research design

6 marks
  • The research question is focused and placed in a specific scientific context.
  • Method choices (variables, controls, range, repeats, data sufficiency) are explained, not just listed.
  • The procedure has enough detail for another student to reproduce it.

Criterion B: Data analysis

6 marks
  • Raw and processed data are traceable, with units and uncertainties.
  • Calculations, graphs, and any statistics are correct and fit the research question.
  • Uncertainties are propagated or discussed where they matter.

Criterion C: Conclusion

6 marks
  • The answer to the research question is explicit and backed by your processed data.
  • The claim is no stronger than the evidence allows.
  • The result is compared with published values, theory, or other studies.

Criterion D: Evaluation

6 marks
  • Weaknesses are specific to this investigation, not generic.
  • The report explains how much each weakness affected the results.
  • Improvements are realistic and target the weaknesses you identified.

Where Chemistry IAs usually lose marks

Marksy flags these in your draft and links each one to the sentences it is about.

  • Quantities left vagueGive concentrations, volumes and masses, and say how you made each solution, so someone else could repeat your method exactly.Criterion A
  • Too few values to show a trendThree concentrations can't show a curve. Plan enough values across a wide enough range, with repeats at each one.Criterion A
  • Uncertainty not carried throughCarry the uncertainty from your glassware and instruments into the values you calculate, such as an enthalpy change or a rate.Criterion B
  • Graphs with points but no relationshipIf your question is about a relationship, add a best-fit line and use its gradient or equation, not just the plotted points.Criterion B
  • No comparison with a literature valueWhere a published value exists, compare your result with it, give the percentage error, and say whether your uncertainty explains the gap.Criterion C
  • Systematic errors missedHeat lost to the surroundings in calorimetry is the classic one. Say which way it pushed your result and how you would reduce it.Criterion D

Before you upload

  • Include your raw data tables, not only the processed graphs.
  • Keep units and uncertainties in the table headings.
  • Show one full worked example of each calculation.
  • If you used a database or simulation, say where the data came from.

Your draft stays at the centre

Marksy reads the work you upload, points each comment back to your writing, and puts the most important changes first.

Can your method generate enough quality data to answer the chemistry question convincingly?
Read Chemistry IA Planning Guide
  1. 1

    Upload your draft

    A PDF of your Chemistry IA, finished or not. Every comment stays connected to your own writing.

  2. 2

    Read the comments

    Highlights show which passage each comment is about.

  3. 3

    Fix the important parts first

    Work down a short list instead of making scattered edits.

  4. 4

    Keep the final say

    Accept, adapt or ignore each suggestion. You stay the author.

What students wrote afterwards

From Trustpilot, as written.

marksyib has saved my ib diploma. thanks to it, my IA's were perfect and got the points i needed. really recommended.
maya balog, 13 February 2026
Marksy ib allowed me to be able to finish my IAs much before allowing me to be able to relax better. 100% recommended
Jordi Pasalaigua Peiron, 25 March 2026
Read the reviews on Trustpilot

Your work stays your work

Marksy reads the draft you upload and comments on it. It doesn't rewrite your assessment, and your files are never used to train AI.

Read the safety answers
  • Private to youOnly you can see your work unless you choose to share it.
  • Never used for trainingYour coursework is not added to any AI training data.
  • Feedback, not ghostwritingUse the report to improve your own analysis and decisions.
  • Delete it whenever you wantYou control the files stored in your account.

Questions before you upload

Still planning? The coursework guide covers the criteria and what to ask yourself while you write. Open the guide

It reads the worked calculations in your report and flags steps that look wrong or unclear, such as missing units or uncertainty that isn't carried through. Show one full worked example so it can follow your method.

Yes. Lab, database and simulation investigations use the same criteria. Marksy checks that your method explains where the data came from and why it is enough.

No. SL and HL students do the same scientific investigation and are marked against the same four criteria.

Yes. Up to three students can collect data together, but each of you writes your own Chemistry report. Upload your own report.

Along with the IB criteria, Marksy's science IA marking uses notes on how real IB-marked reports scored at each mark band. That helps it mark weak and strong reports more like an IB moderator would.

On 162 Chemistry IAs the IB had already marked, 93% of Marksy's marks landed within one grade. Across all 1,317 IAs and TOK essays we tested, it was 92%. On a set with as many weak as strong essays, it scored 74/100 on our marking score, against 65 for ChatGPT, 61 for Claude and 57 for Gemini. Every number, and how we tested, is on the grading accuracy page.

Yes. Marksy checks your Chemistry IA against the IB assessment criteria for it and returns marks, comments and fixes instead of generic essay advice.

Yes. Early drafts are useful because the report can show a weak criterion before you spend hours polishing the wrong section. You can revise and grade another version later.

A free account includes 5 gradings a month. You don't need a card.

No. Marksy reads your existing work, explains each comment, and suggests what to revise. The writing and the final decisions stay yours.

Your upload is private to your account, is not used to train AI models, and can be deleted whenever you want.

Stop guessing what to fix in your Chemistry IA

Upload the version you have now and find the parts holding it back.

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