The student clearly states the independent variable as the mass of ascorbic acid and the dependent variable as the browning rate of apple cubes, measured by absorbance. However, the research question lacks a specification of the measurement method using the spectrophotometer. The student includes a detailed background theory relevant to the research question and provides a clear explanation of the techniques used for measuring the variables. Nonetheless, there are gaps in the explanation of the sampling technique, the rationale for the number of trials, and the controlled variables, which need further clarification. The student adequately addresses safety, ethical, and environmental issues, and the methodology is described in sufficient detail for reproducibility without irrelevant information.
