The student provides a focused and detailed description of the main topic, which is to investigate the thermal decomposition of different metal carbonates and possibly find an alternative to calcium carbonate for construction purposes. The background information provided is relevant and well-organized, explaining thermal decomposition and what influences its rate specifically in the case of metal carbonates. The methodology of the investigation is highly appropriate to the topic, as it involves finding the change in mass of the sample before and after heating to assess how much of the compound decomposed, and includes appropriate steps to assure the relevancy and validity of the obtained results. The student also shows full awareness of safety hazards, ethical concerns, and environmental issues that can arise during the experiment.
