IB Chemistry IA Grader — Free AI Feedback on Your Lab Report

IBLens grades your IB Chemistry Internal Assessment against the official IB Chemistry IA rubric — all four criteria — in 60 seconds. Get feedback on Research design, Data analysis, Conclusion, and Evaluation. A free preview is included; the full report is $4.99.

IB Chemistry IA rubric (24 marks)

The Chemistry IA uses the current (first assessment 2025) scientific investigation rubric — four criteria worth 6 marks each, identical at SL and HL, with a 3,000-word maximum — but Chemistry-specific expectations apply:

• Research design (6 marks): Focused research question set in a scientific context, with clearly identified independent, dependent, and controlled variables and appropriate safety and ethical considerations for chemical procedures.
• Data analysis (6 marks): Correct propagation of uncertainties through calculations, appropriate significant figures, and correct processing and presentation of data.
• Conclusion (6 marks): A conclusion justified by the analysis, answering the research question and compared with accepted chemical theory, including correct chemical equations where relevant.
• Evaluation (6 marks): Discussion of systematic and random errors, their effect on your result, and realistic improvements specific to your method.

Common IB Chemistry IA mistakes

• Incorrect uncertainty propagation: Not using the correct rules (addition/subtraction vs multiplication/division) when propagating uncertainties through multi-step calculations.
• Too few repeats: Chemistry IAs need enough data (typically at least 5 values of the independent variable) to demonstrate a trend. Fewer data points significantly limits your Data analysis score.
• Confusing systematic and random errors: Listing "human reaction time" as a systematic error rather than a random one, or vice versa. IBLens checks whether your error analysis uses correct terminology.
• Missing or incorrect chemical equations: If your investigation involves a chemical reaction, the balanced equation must be present and correct.

Frequently asked questions

Is the Chemistry IA grader free?

Every essay gets a free preview (band range, weakest criterion with full feedback, top risks). The full report — exact score and every criterion with comments — unlocks for $4.99, or $19.99 for a pack of five.

Can I use this for IB Chemistry EE?

For Chemistry Extended Essays, use the Extended Essay grader and select Chemistry as your subject. See also our IB Chemistry EE guide.