The student clearly stated the independent and dependent variables in the research question, identifying the presence or absence of Iron(II) Sulfate (FeSO₄) and the temperature range as independent variables, with the dependent variable being the time taken for the blue-black complex to form. However, the student did not describe the method of analysis in the research question, which should have included specific details on how measurements would be taken. The background theory provided is robust, covering relevant concepts and justifying the choice of techniques for measuring variables. The student also effectively identified and controlled variables, addressed safety, ethical, and environmental issues, and presented a detailed methodology that allows for reproducibility without irrelevant or repetitive information. Nonetheless, there is a lack of discussion regarding the choice of aspects, such as the number of trials and the precision of measurements.
