IB Chemistry SL Internal Assessment Example

You stated a focused, measurable question and defined freezing point in an objective way using the plateau temperature.

You placed the investigation in a relevant real-world context and used scientific background to justify the predicted trend.

Your method includes thoughtful planning such as repeats, a concentration range, randomisation, and control of key variables.

The research question would be stronger if the concentration range were built directly into the question.

The solution-making procedure does not actually produce the stated molarities because the solute is added to 100 mL of water rather than making up a final 100 mL solution.

Calibration is not explained well enough across the sub-zero range where the measurements are taken.

You present raw repeated data clearly, which makes it easy to follow the measurements back to the source.

Your processing brings together averages, uncertainties, theoretical values, and regression information in a useful way.

You use graphs and comparisons that show a coherent overall trend in the data.

Some table labeling and regression presentation are unclear, which reduces precision of communication.

The uncertainty treatment is good in places but not fully complete because the half-range is not clearly combined with or compared to the probe uncertainty.

The theoretical comparison is weakened by the use of molarity as a substitute for molality and by the mismatch between the claimed and actual solution concentrations.