The student clearly stated the independent variable, which was the mass of copper sulfate added, and the dependent variable, the rate of reaction measured by the change in illuminance over time. However, the posed research question lacked a description of the method of analysis, which should have been specified for clarity. The student provided a detailed background theory relevant to the research question, discussed the sampling technique, and effectively identified controlled variables. While environmental issues were addressed, the student failed to identify any ethical concerns related to the investigation, which should have been clarified. Overall, the methodology was well-described and free of irrelevant information, ensuring reproducibility of the experiment.
