The student clearly stated the independent variables of temperature and the physical state of sodium hydrogen carbonate, as well as the dependent variables of the rate constant k and activation energy Ea for carbon dioxide production. However, the student did not adequately describe the method of analysis in the research question, which should have detailed how the rate of carbon dioxide production would be measured. The student provided a thorough background theory relevant to the research question and explained the choice of techniques for measuring the variables effectively. The methodology was detailed and well-organized; however, the student did not address the controlled variables, safety, ethical, and environmental issues associated with the investigation, which needed improvement. Overall, the methodology was sufficiently described to enable reproducibility without unnecessary detail.
