Chemistry - annotated exemplar Level 3 AS91388

Demonstrate understanding of spectroscopic data in
chemistry (3.2)

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TKI Chemistry Assessment Resources

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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.

Low Excellence

Commentary
Student work extract

Student 1 (PDF, 59KB)

For Excellence, the student needs to demonstrate comprehensive understanding of spectroscopic data in chemistry.

This involves justifying the structure of organic molecules by integrating spectroscopic data.

This student has integrated the three types of spectroscopic data to justify the identification of the unknown molecule (1).

For a more secure Excellence, the student could explain how other molecules were excluded based upon the information from the spectroscopic data supplied.

High Merit

Commentary
Student work extract

Student 2 (PDF, 48KB)

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 explained how the three types of spectroscopic data were used to identify the molecule (1).

To reach Excellence, the student could intergrate more of the identified data to justify the identification of the molecule.

Low Merit

Commentary
Student work extract

Student 3 (PDF, 50KB)

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
Student work extract

Student 4 (PDF, 66KB)

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
Student work extract

Student 5 (PDF, 45KB)

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
Student work extract

Student 6 (PDF, 45KB)

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.

 
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