How to ace the QCE Chemistry IA3 (Research Investigation)

Published 2026-05-25 · Updated 2026-05-25

The Research Investigation is the assessment most QCE Chemistry students misunderstand, and the misunderstanding is costly. Many students treat it like a second prac report and start designing an experiment. It is not a prac report. You do not run a lab. The IA3 is secondary research: you evaluate a claim by gathering evidence from credible published sources, then argue whether the evidence supports it.

Once that clicks, the task gets a lot less intimidating. The marking is fully spelled out across four criteria, and the syllabus tells you exactly what a top-band response looks like for each. This guide covers what the IA3 actually is, how it differs from the IA2, what each criterion rewards, a worked example, the mistakes that cost marks, and how to plan it.

What the IA3 Research Investigation actually is

The Research Investigation is IA3, worth 20% of your overall subject result, marked out of 20 marks. It sits in Unit 4, which covers the properties and structure of organic materials and chemical synthesis and design.

The syllabus describes the task plainly: you "gather evidence related to a research question to evaluate a claim relevant to Unit 4 subject matter." Three words matter most there: evidence, claim, and evaluate. You are handed a list of claims by your teacher, you pick one, you research it, and you decide what the evidence says about it.

The conditions:

• Worth: 20% of your subject result, marked out of 20.
• Unit: Unit 4, so organic chemistry, synthesis and design contexts.
• Basis: a claim you select from a list provided by your teacher.
• Evidence: gathered from scientifically credible sources, such as books and podcasts by well-credentialed scientists, popular science websites or magazines, websites of governments, universities, independent research bodies or science and technology manufacturers, and scientific journals.
• Time: designed to take about 10 hours of class time, developed in class and your own time.
• Task type: individual. Some steps (selecting the claim, identifying the relevant scientific concepts, and conducting the research) may be done as a group, but the response you submit is your own.
• Response: one of either a written report up to 2000 words, or a multimodal presentation up to 11 minutes (at least two modes at once).

How the IA3 differs from the IA2

This is worth pinning down, because the two internal investigations are easy to confuse.

If you find yourself writing a method and a risk assessment for the IA3, stop. That is the IA2.

The four criteria, and how to max each

Your 20 marks are split evenly across four criteria, 5 each. Note that the grouping is different from the IA2: here "Forming and Finding" are combined into one criterion, while "Interpreting" and "Evaluating" are split into two.

Forming and Finding (5 marks)

The top band (4 to 5) wants a considered rationale that shows clear development of the research question from the claim, a specific and relevant research question, selection of sufficient and relevant sources, appropriate use of genre conventions, and acknowledgment of sources through appropriate referencing.

Two levers here. First, the research question must visibly grow out of the claim. Examiners want to see the chain: this is the claim, this is the aspect of it I am testing, so this is my question. Second, sources are explicitly marked, so a couple of websites will not do. Select sufficient and credible sources, and reference them properly throughout.

Analysing (5 marks)

The top band wants identification of sufficient and relevant evidence, thorough identification of relevant trends, patterns or relationships in the evidence, and thorough and appropriate identification of the limitations of the evidence.

The limitations work is where most students fall short. It is not enough to summarise what your sources say. You have to identify the trends across them and then interrogate the evidence itself: how current is it, how was it gathered, does it actually bear on your question, where is it thin. Thorough limitations analysis is what separates a 3 from a 5.

Interpreting (5 marks)

The top band wants justified scientific arguments, a justified conclusion linked to the research question, and fluent and concise use of scientific language and representations.

Your conclusion has to answer the research question you posed, not the broad claim, and it has to be justified by the evidence you analysed. Build an actual argument with chemistry in it (equations, correct terminology, data), not a general opinion. Keep the writing tight: "fluent and concise" is in the descriptor.

Evaluating (5 marks)

The top band wants a justified discussion of the quality of evidence, extrapolation of the credible findings of your research to the claim, and suggested improvements and extensions that are considered and relevant to the claim.

This is the criterion that closes the loop back to the original claim, and it is where many students simply stop early. Three things must happen. Judge the quality of your evidence and justify that judgement. Apply your findings back to the claim, not just to your narrow question. And suggest improvements and extensions that follow from the specific gaps you found, not generic advice.

A worked example: evaluating a fuel claim

Here is how one claim flows through all four criteria. (This is an illustrative example, not a real past QCAA task.)

Suppose your teacher's list includes the claim: "Bioethanol is a more environmentally sustainable transport fuel than petrol." This is a Unit 4 claim, tied to ethanol production and chemical synthesis.

• Forming and Finding: Develop a specific research question from the claim, for example, "To what extent do published life-cycle carbon emissions of bioethanol compared with petrol support the claim that bioethanol is a more sustainable transport fuel?" Gather sufficient, credible sources (government energy agencies, peer-reviewed life-cycle studies, university research), and reference them. The rationale shows why this question tests a real, measurable aspect of the broad claim.
• Analysing: Identify the evidence (life-cycle emissions figures, energy-return ratios), describe the trends across sources, and then identify limitations thoroughly: different studies use different system boundaries, some exclude land-use change, some are a decade old. The combustion chemistry itself is clean, C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(g), but the sustainability question lives in the full production cycle, which is exactly where the evidence gets messy.
• Interpreting: Build a justified argument from the evidence and draw a conclusion that answers your research question, using correct scientific language. For instance, the evidence may support a qualified conclusion: bioethanol's tailpipe carbon is offset by crop uptake, but the net benefit depends heavily on feedstock and land use.
• Evaluating: Judge the quality of your evidence (how credible, how current, how comparable), extrapolate your findings back to the original claim (the claim holds only under specific feedstock conditions, so it is an overstatement as written), and suggest considered improvements (narrowing the claim to a feedstock, or sourcing more recent life-cycle data).

One claim, evaluated against four criteria, with no test tube in sight. That is the whole task.

The mistakes that quietly cost marks

1. Treating it like a prac report. The single most common error. There is no experiment, no method, no risk assessment. It is research.
2. A research question that does not come from the claim. Forming and Finding rewards a question that clearly develops from the claim. A question floating free of the claim caps the criterion.
3. Thin or non-credible sources. A handful of general websites is not "sufficient and relevant." Use the credible source types the syllabus names, and reference them.
4. Summarising instead of analysing. Listing what each source says is not analysis. Identify trends across the evidence and interrogate its limitations.
5. Concluding about the claim instead of the question. Interpreting wants a conclusion to your research question. Evaluating is where you swing back to the claim. Keep them in the right criteria.
6. A weak evaluation. Stopping before you judge evidence quality, apply findings to the claim, and suggest grounded improvements leaves marks on the table in the highest-leverage criterion.
7. Padding past the limit. The response is capped at 2000 words (or 11 minutes), so extra length cannot earn extra marks. Treat the limit as a hard ceiling and tighten your writing instead.

How to plan your investigation

1. Pick a claim from your teacher's list that you can find real, credible evidence on.
2. Identify the scientific concepts behind the claim so you know what evidence you actually need.
3. Pose a specific research question that develops clearly from the claim and is answerable from published evidence.
4. Gather sufficient, credible sources and reference them as you go, not at the end.
5. Identify trends and relationships in the evidence, then thoroughly identify its limitations.
6. Construct a justified argument and a conclusion that answers your research question.
7. Evaluate: judge the quality of the evidence, apply your findings back to the claim, and suggest considered improvements and extensions.
8. Stay within the length and write in a proper scientific genre with referencing throughout.

How to prepare

The IA3 rewards a small set of research skills that almost no one practises by accident: turning a broad claim into a sharp, answerable question, judging whether a source is credible, and separating what your evidence shows about your question from what it shows about the claim. The highest-leverage parts to get checked before you submit are your research question and your evaluation section.

That is where an interactive tutor helps. Avocado is an AI-powered Chemistry tutor built specifically for the QCE syllabus, so you can test whether your research question really develops from the claim, pressure-test the chemistry in your argument, and get feedback on where a section sits against the Forming and Finding, Analysing, Interpreting and Evaluating criteria before it counts.

Frequently asked questions

How much is the IA3 worth? 20% of your overall QCE Chemistry result, marked out of 20 marks across four criteria.

Do I run an experiment? No. The IA3 is secondary research. You evaluate a claim using evidence from credible published sources. Running a modified experiment is the IA2.

Where does the claim come from? You select it from a list provided by your teacher.

Written report or presentation? Either. A written report up to 2000 words, or a multimodal presentation up to 11 minutes.

What does it cover? Unit 4: the properties and structure of organic materials, and chemical synthesis and design.

Is it a group task? It is an individual task. Selecting the claim, identifying the relevant scientific concepts, and conducting the research may be done as a group, but the response you submit is your own.

How long should it take? The task is designed to be completed in about 10 hours of class time, plus your own time.

Assessment details sourced from the QCAA Chemistry General Senior Syllabus (2025) and the QCAA Chemistry sample assessment materials. Always confirm current conditions with your teacher and the QCAA website.