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Chemistry - trial annotated exemplar Level 3 AS91388
Demonstrate understanding of spectroscopic data in
chemistry (3.2)
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This annotated exemplar is intended for teacher use only. The student work shown does not always represent a complete sample of what is required. Selected extracts are used, focused on the grade boundaries, in order to assist assessors to make judgements at the national standard.
Excellence
| Commentary | ||
|---|---|---|
For Excellence, the student needs to demonstrate understanding of spectroscopic data in chemistry. This involves producing evidence that shows the integration of IR, C-13 NMR and mass spectra to justify the structure of an unknown molecule. The student needs to produce evidence of integrating the links between the key aspects of the three spectra to the correct structure of the unknown molecule. This student has explained the links between the key peaks on the three spectra to the structure of the unknown molecule (1). The student has provided evidence of integrating the information from the three spectra to rule out some the possible structures (2) and to the justify the correct structure (3). |
High Merit
| Commentary | ||
|---|---|---|
For Merit, the student needs to undertake effective project management to support technological practice. This involves determining the structure of organic molecules using spectroscopic data. This student has explained how the three types of spectroscopic data were used to identify the molecule (1). The student begins to link the key peaks on the three spectra to the structure of the unknown molecule. This evidence does not reach Excellence because the student needs to fully integrate the information from the three spectra to rule out other possible structures, and to justify the correct structure of the unknown molecule. |
Low Merit
| Commentary | ||
|---|---|---|
For Merit, the student needs to demonstrate in-depth understanding of spectroscopic data in chemistry. This involves determining the structure of organic molecules using spectroscopic data. This student has identified a possible structure using some of the identified data from two types of spectroscopic data (1). For a more secure Merit, the student could explain how the identified data supports the identification of the molecule. |
High Achieved
| Commentary | ||
|---|---|---|
For Achieved, the student needs to demonstrate understanding of spectroscopic data in chemistry. This involves identifying discrete aspects of the structure of organic molecules using teacher-provided spectroscopic data. This student has identified discrete aspects of the spectroscopic data (1) and has used some of the spectroscopic data to identify a possible structure (2). To reach Merit, the student could explain how two different types of spectroscopic data result in the identification of the molecules structure. |
Low Achieved
| Commentary | ||
|---|---|---|
For Achieved, the student needs to demonstrate understanding of spectroscopic data in chemistry. This involves identifying discrete aspects of the structure of organic molecules using teacher-provided spectroscopic data. This student has identified discrete aspects from all three types of spectroscopic data (1). For a more secure Achieved, the student could identify what functional group that relates to the peaks on the infrared (IR) graph. |
High Not Achieved
| Commentary | ||
|---|---|---|
For Achieved, the student needs to demonstrate understanding of spectroscopic data in chemistry. This involves identifying discrete aspects of the structure of organic molecules using teacher-provided spectroscopic data. This student has identified some discrete aspects of two spectroscopic techniques (1). To reach Achieved, the student could identify the main peaks on the infrared (IR) graph, use the mass spectroscopy data to identify the molecular formula and use the NMR to identify the number of unique carbon environments. |