Exemplars

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How does an increase in ionic radii (10-12 m) of central metal ions that are period 4 transition metals (Co2+, Cu2+, Ni2+, Mn2+, Fe2+) affect the energy difference in the d-orbital splitting (KJ/mol) of color complexes calculated through highest absorbance on a spectrophotometer?

May 2023
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Examiner's summary

Criterion A [2/2]:

The student's choice of the topic and research question is well-justified, as they explain the application of metal ion complex chemicals in the dye industry and express personal interest in the use of dyes. Additionally, the student demonstrates strong initiative in designing and conducting the study by providing a list of assumptions, an in-depth explanation of the hypothesis, and a description of the results of the preliminary trial. They also display personal input in conducting the study by providing photos of their experimental setup.

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Criterion B [6/6]:

The student presents a focused and detailed description of the main topic, providing a clear explanation of the investigation into the effect of increasing ionic radii of central metal ions on the energy difference in the d-orbital splitting of color complexes. The background information is relevant and well-organized, offering a comprehensive understanding of the key concepts necessary for the experiment. Additionally, the methodology is highly appropriate to the topic, focusing on answering the research question by identifying the independent and dependent variables. The student also includes appropriate steps to assure the relevancy and validity of the obtained results, demonstrating a thorough understanding of the experimental process. However, there is no mention of the student's awareness of safety hazards, ethical concerns, or environmental issues that can arise during the experiment.

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Criterion C [0/0]:

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Criterion D [0/0]:

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Criterion E [0/0]:

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This is an example of past student work. Do not copy or submit as your own. Use to understand the requirements, expectations, structure and flow.