IB Chemistry HL Extended Essay Example

You communicate a relevant and purposeful chemistry investigation with a clear real-world context.

Your research question is stated and connected to practical experimental work.

You include a generally appropriate range of methods and apparatus for comparing heated oil samples.

The investigation focus is too broad, combining several oils, heating states, and UV measurements in one question.

The UV-theory section is unfinished, which weakens the clarity of your rationale.

Some methodological choices are not tightly controlled, especially temperature, solvent choice, and variable standardization.

You show solid basic understanding of oil acidity, free fatty acids, titration, and instrumental measurement.

You use a good range of chemistry terminology and formulae appropriately in many places.

You apply source material to give context and to support the experimental topic.

Some chemical explanations are inaccurate, especially the discussion of acidity and thermal change.

The UV explanation is incomplete, so the theory does not fully support the later interpretation.

Source use is sometimes too general, and the regulatory comparison is not always methodologically secure.