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Chemistry  annotated exemplar level 2 AS91161
Carry out quantitative analysis (2.1)
Show: All Chemistry exemplars
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Download all these exemplars and commentary (PDF, 333KB) 
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  

For Excellence, the student needs to carry out comprehensive quantitative analysis. This involves:
Answers to calculations must demonstrate correct units and appropriate use of significant figures. The student has collected titration data containing three titre values within 0.2 mL of each other and the average titre value is within 0.2 mL of the expected outcome (1). Quantitative problems that involve more than two steps and the use of stoichiometric principles, involving n=m/M and c=n/V are solved using appropriate procedures (2). For a more secure Excellence, the student could give all final answers to three significant figures and use correct units (3). 
High Merit
Commentary  

For Merit, the student needs to carry out indepth quantitative analysis. This involves:
Titration calculations must be carried out correctly using only concordant titre values. The student has collected titration data that contains three titre values that fall within 0.2 mL of each other but the average titre value is within 0.5 mL of the expected outcome (1). Quantitative problems that involve at least two steps, involving n=m/M and c=n/V have been solved using appropriate procedures (2). To reach Excellence, the student could give all final answers to three significant figures (3) and solve problems involving more than two steps and using stoichiometric principles (4). 
Low Merit
Commentary  

For Merit, the student needs to carry out indepth quantitative analysis. This involves:
Titration calculations must be carried out correctly using only concordant titre values. The student has collected titration data that contains three titre values that fall within 0.2 mL of each other but the average titre value is within 0.5 mL of the expected outcome (1). Quantitative problems involving c=n/V have been solved correctly (2). A quantitative problem involving n=m/M has been solved (3). For a more secure Merit, the student could correctly solve a quantitative problem that uses the relationship n=m/M involving at least two steps (3). 
High Achieved
Commentary  

For Achieved, the student needs to carry out quantitative analysis. This involves:
The student has collected titration data that contains three titre values that fall within 0.4 mL of each other and the average titre value is within 0.8 mL of the expected outcome (1). A quantitative problem involving c=n/V (titration problem) has been solved (2). A Quantitative problem using n=m/M is calculated correctly (3). To reach Merit, the student could collect titration data for which the average titre value is within 0.5 mL of the expected outcome (1) and correctly calculate a twostep quantitative problem that uses the relationship n=m/M (4). 
Low Achieved
Commentary  

For Achieved, the student needs to carry out quantitative analysis. This involves:
The student has collected titration data that contains three titre values that fall within 0.4 mL of each other and the average titre value is within 0.8 mL of the expected outcome (1). Titration calculation is carried out correctly (2). Part of a quantitative problem using n=m/M has been solved correctly (3). For a more secure Achieved, the student could correctly solve an entire quantitative problem using n=m/M. 
High Not Achieved
Commentary  

For Achieved, the student needs to carry out quantitative analysis. This involves:
The student has collected titration data that contains three titre values and the average titre value is within 0.8 mL of the expected outcome (1). Titration calculation is carried out correctly (2). A quantitative problem using n=m/M has been solved (3). To reach Achieved, the student could collect titration data that contain at least three titre values that fall within a range of 0.4 mL (4). 