IB Chemistry SL Internal Assessment Example

You framed the investigation in a clear, specific chemical context and showed why measuring oxygen production is a valid way to study the reaction.

You included thoughtful controls and relevant methodological considerations such as repeated trials, temperature control, and uncertainty estimates.

Your procedure is detailed enough that another student could follow the overall method with only a few ambiguities.

Some important operational details are still not fully specified, especially how the initial-rate interval is chosen from the video data.

The justification for the chosen temperature range could be stronger if it were linked more directly to kinetics rather than mainly practicality.

A few steps that affect reproducibility, such as exact timing and corrections for pressure or volume conditions, are not fully explained.

Your raw and processed tables are clearly organized and include uncertainty information, which makes the data easier to follow.

You show a sensible workflow from raw measurements to mean rates and then to an Arrhenius-style treatment.

Your worked example for averaging is a real improvement and makes your processing easier to audit.

The rate calculation is not perfectly consistent across trials because the endpoint volumes vary, so the values are not all derived from the same interval.

Your uncertainty treatment is thoughtful, but the uncertainty in the final activation energy is not fully carried through.

Some graphing and fitting choices are a little fragile for kinetic interpretation, especially the quadratic trendline and the sign convention used in the linearised plot.