The student clearly stated the independent variable as the concentration of sulfuric acid and the dependent variable as the rate of calcium carbonate decomposition, allowing for a direct investigation into their relationship. The methodology was well-detailed, explaining the analytical methods used, including the preparation of solutions and measurement techniques, which enhances the reproducibility of the experiment. The student effectively discussed controlled variables, safety considerations, and environmental issues, demonstrating a thorough understanding of the investigation's context. However, there was a lack of explanation regarding the choice of techniques for measuring the variables and no mention of ethical considerations, which would have strengthened the overall assessment.
