The student clearly stated the independent variable as the aqueous NaCl concentration and the dependent variable as the mass loss of iron due to rust formation in the research question. However, the research question lacked specificity regarding the method of analysis, which should have been revised to clarify how the data would be quantified. The student successfully included a detailed background theory relevant to rust formation and provided a clear explanation of the techniques used for measuring variables. Additionally, the methodology was described in sufficient detail, with clear steps and well-identified controlled variables. Safety, ethical, and environmental issues were also appropriately addressed. Overall, the methodology was coherent and allowed for reproducibility of the investigation.
