The most effective IB Chemistry IA timeline runs for about eight weeks, with early feasibility checks, protected laboratory time, and a full week reserved for revision after teacher feedback. The IB recommends approximately 10 hours of teaching time for the scientific investigation, but this is not a limit on all independent planning, analysis, and writing.
Your school sets the actual proposal, draft, and submission deadlines. Start with the final school deadline and work backwards, because the IB does not publish one universal submission date for every Chemistry student.
What the current IB Chemistry IA requires
For the course first assessed in 2025, the IA is officially called the scientific investigation. It is an open-ended investigation in which you gather and analyse data to answer your own research question.
At both SL and HL, it:
- contributes 20% of the final Chemistry result
- is marked out of 24 marks
- has a recommended allocation of approximately 10 hours of teaching time
- produces an individual written report with a maximum of 3,000 words
- uses the same assessment criteria at SL and HL
- is marked by your teacher and externally moderated by the IB
The four criteria are equally weighted:
| Criterion | Maximum marks | Central question |
|---|---|---|
| Research design | 6 | Does the report communicate a focused question and reproducible, justified methodology? |
| Data analysis | 6 | Are data recorded, processed, and presented accurately, with appropriate treatment of uncertainty? |
| Conclusion | 6 | Does the conclusion answer the question and compare the result with accepted scientific context? |
| Evaluation | 6 | Are methodological weaknesses explained and matched with realistic improvements? |
This balance affects your timeline. Leaving the conclusion and evaluation until the final evening risks half of the available marks, not merely two short closing sections. The RevisionDojo IB Chemistry IA guide provides a criterion-by-criterion overview for the current course.
A realistic eight-week IB Chemistry IA timeline
The following schedule allocates the recommended 10 class hours while expecting manageable independent work between lessons. Your teacher may compress or extend it according to laboratory access, holidays, and school deadlines.
| Week | Main stage | Suggested class time | Independent work and weekly outcome |
|---|---|---|---|
| 1 | Topic exploration | 0.75 hour | Investigate two or three possible topics. Check syllabus relevance, equipment, safety, measurable variables, and available scientific literature. Finish with a shortlist. |
| 2 | Research question and proposal | 1 hour | Define the system, variables, measurement method, range, controls, and scientific rationale. Submit a concise proposal and preliminary risk assessment. |
| 3 | Preliminary trials | 1.25 hours | Test the apparatus and procedure. Identify unsuitable concentrations, timings, ranges, or measurement techniques. Revise the method before full collection. |
| 4 | Main data collection I | 1.5 hours | Collect systematic raw data, qualitative observations, uncertainties, and contextual conditions. Back up records immediately. |
| 5 | Main data collection II | 1.5 hours | Complete repeats and investigate questionable measurements where time permits. Confirm that the dataset can answer the research question. |
| 6 | Processing and analysis | 2 hours | Build final tables and graphs, show sample calculations, process uncertainties, and identify trends and anomalies. Draft data analysis independently. |
| 7 | Conclusion, evaluation, and draft | 1 hour | Complete a full report and submit the permitted draft by the teacher's deadline. Compare findings with accepted scientific context. |
| 8 | Feedback and final submission | 1 hour | Interpret feedback, revise independently, check citations and word count, proofread, and submit the authenticated final report. |
| Total | 10 hours | The report is complete before the school deadline. |
Treat this as a planning model rather than an IB-mandated calendar. RevisionDojo also provides a suggested Chemistry IA timeline and downloadable student planning sheets.
Weeks 1 and 2: Choose a feasible question
A strong topic is not necessarily unusual or technically complicated. It must permit meaningful chemical analysis with the apparatus, chemicals, time, and safety controls available at your school.
Before approving an idea, ask:
- Is the outcome clearly related to chemistry rather than mainly biology or consumer preference?
- Can the dependent variable be measured with suitable precision?
- Is there a sensible range of independent-variable values?
- Can important variables be controlled or monitored?
- Is enough data likely to be produced for analysis?
- Can the work be completed safely within the available sessions?
- Is there reliable literature for the scientific rationale and comparison?
For example, “How does temperature affect reaction rate?” is too broad. A more useful question identifies the chemical system, defined temperature range, dependent measurement, and analytical method.
Your proposal should include the research question, relevant theory, proposed variables, materials, procedural outline, planned processing, and safety or environmental considerations. The RevisionDojo guide to designing a science IA experiment can help you test feasibility before committing laboratory time.
Week 3: Use trials to repair the method
A preliminary trial is not a miniature performance of a method you have already decided to keep. Its purpose is to expose weaknesses while they are still inexpensive to correct.
During trials, check whether:
- the measured change is larger than the instrument uncertainty
- the selected range produces a detectable pattern
- reactions are too fast, slow, hazardous, or inconsistent
- the endpoint or measurement rule is objectively defined
- temperature, mixing, contamination, or gas loss affects results
- the planned quantities allow sufficient repeats
Record trial decisions in your laboratory notes. If the method changes, preserve the reasoning behind the change, as this helps demonstrate that your final methodological choices were deliberate.
Weeks 4 and 5: Protect the quality of your data
Create raw-data tables before entering the laboratory. Headings should identify quantities and units, while uncertainties should reflect the measuring instruments or justified measurement procedure.
Record results directly rather than reconstructing them later. Include relevant qualitative observations such as colour changes, precipitation, gas leakage, incomplete dissolution, or an unstable endpoint, because these details may explain variation in the numerical results.
Do not silently delete an anomalous result. Check for a documented procedural reason, repeat the measurement if the timetable permits, and discuss any justified analytical treatment transparently. A failed prediction is not a failed IA, but an inadequate or poorly documented dataset can prevent a defensible conclusion.
If students collaborate in a small group, the current course allows limited collaboration where appropriate. However, each student must have an individual research question through a different independent or dependent variable, collect unique data, and write an individual report.
Week 6: Analyse before writing the conclusion
Do not decide your conclusion first and then select data that support it. Complete the processing, uncertainty treatment, and graphical analysis before judging what the evidence shows.
A sound analysis normally includes:
- clearly labelled raw and processed data tables
- consistent units, decimal places, and significant figures
- one demonstrated example of each important calculation
- suitable means, rates, gradients, derived quantities, or statistical measures
- graphs with labelled axes, units, uncertainty information where appropriate, and justified trend lines
- discussion of patterns, variability, anomalies, and the strength of the evidence
The correct technique depends on the research question. A sophisticated statistical test is not automatically better than a well-justified gradient, uncertainty comparison, or regression. The RevisionDojo Chemistry data-analysis guide explains tables, graphing, processing, and uncertainty, while the science IA statistics guide helps students decide when statistical methods are informative.
Weeks 7 and 8: Draft, obtain feedback, and revise
By the beginning of Week 7, assemble a complete report rather than submitting disconnected sections. A full draft lets your teacher identify problems in the relationship between the design, analysis, conclusion, and evaluation.
Teacher guidance is permitted, but the report must remain your work. Follow your school's instructions about the number and form of feedback opportunities. Feedback should help you identify areas to improve, not provide replacement sentences, calculations, or an edited final report.
When revising, prioritise substantive issues:
- Confirm that every analytical step helps answer the research question.
- Support the conclusion with processed numerical evidence and associated uncertainty.
- Compare the result with traceable scientific literature or accepted values where relevant.
- Explain how each important methodological weakness affected the data or conclusion.
- Pair each weakness with a specific, feasible improvement.
- Remove repetition and material that does not earn evidential value.
You can inspect a marked Chemistry IA exemplar on electrolysis to see how criterion-level strengths and omissions are distinguished. Near the end of Week 7, the IB Chemistry IA Grader can provide an additional rubric-based self-check, but its output is guidance rather than an official mark.
Common timeline mistakes
Skipping the pilot investigation
Students sometimes protect writing time by removing trials. This often creates more work because unusable ranges, uncontrolled temperatures, or imprecise measurements are discovered only after the main experiment.
Writing only after all laboratory work ends
Prepare the rationale, variables, risk assessment, method, and empty tables before data collection. Early writing exposes missing methodological details while you can still address them.
Using all available time for data collection
More measurements do not compensate for weak processing or superficial evaluation. Reserve enough time to convert measurements into a reasoned answer.
Treating evaluation as a list of errors
Statements such as “human error” or “do more repeats” are too general. Identify the exact weakness, explain its likely effect, and propose an improvement that directly addresses it.
Ignoring academic integrity until submission
Keep complete citations and version history from the beginning. The IB requires submitted work to be authentic and sources to be acknowledged. If AI-generated text, images, or graphs are included, the IB states that this material must be clearly credited in the text and appropriately referenced; always follow your school's AI policy as well.
Final submission checklist
Before authentication and submission, confirm that:
- the report is no longer than 3,000 words
- the research question is specific and answered consistently
- the final method matches what was actually done
- tables and figures are numbered, labelled, and discussed
- measurements, units, uncertainties, and calculations are consistent
- the conclusion uses quantitative evidence and scientific context
- evaluation links weaknesses, impacts, and realistic improvements
- every borrowed idea, value, method, or quotation is cited
- the submitted file is the correct final version
- you can explain and defend every part of the investigation
Conclusion
A successful IB Chemistry IA timeline protects time for decisions, not just laboratory work. Use the early weeks to test feasibility, the middle weeks to collect defensible data, and the final weeks to analyse, evaluate, and revise a complete report.
The recommended 10 class hours should be distributed across the whole investigation, supported by organised independent work and your school's deadlines. RevisionDojo's Chemistry IA guide, planning sheets, exemplars, and rubric-based grader can help you monitor progress, while Jojo AI should be used only within your school's academic-integrity rules and never as a substitute for your own scientific reasoning.
Sources and referenced URLs
- Official IB Chemistry subject brief for first assessment 2025
- Official IB Chemistry curriculum updates
- IB guidance on artificial intelligence in learning and assessment
- IB academic integrity policy
- RevisionDojo IB Chemistry IA guide
- RevisionDojo suggested Chemistry IA timeline
- RevisionDojo Chemistry IA student planning sheets
- RevisionDojo guide to designing science IA experiments
- RevisionDojo Chemistry IA data-analysis guide
- RevisionDojo science IA statistics guide
- RevisionDojo Chemistry IA electrolysis exemplar
- RevisionDojo IB Chemistry IA Grader