The student clearly states the independent and dependent variables in the research question, identifying the ratios of Ethanol and 2-Propanol as the independent variable and the enthalpy of combustion as the dependent variable. The methodology is well-described, including the technique of calorimetry for measuring the enthalpy of combustion, and the student justifies the choice of concentration intervals and sampling techniques effectively. Safety and ethical considerations are appropriately addressed, although there is a lack of detail regarding the control of variables and environmental issues. Overall, the methodology is sufficiently detailed and free of irrelevant information, allowing for reproducibility of the investigation.
