The student clearly stated the independent variable as the chain length and isomer of alcohols, and the dependent variable as the standard enthalpy of combustion. However, the research question lacked a description of the method of analysis, which would be improved by mentioning calorimetry. The student provided a comprehensive background theory on alcohols and their combustion, and effectively discussed the choice of sampling technique and controlled variables. Additionally, they addressed safety, ethical, and environmental issues associated with the investigation, while also providing sufficient detail on the methodology to ensure reproducibility, thereby maintaining clarity without including irrelevant information.
