AS 91163 annotated exemplars

This annotated exemplar is intended for teacher use only. Annotated exemplars are extracts of student evidence, with commentary, that explain key parts of a standard. These help teachers make assessment judgements at the grade boundaries.

Download all exemplars and commentary [PDF, 369 KB]

TKI Chemistry assessment resources (external link)

For Excellence, the student needs to demonstrate comprehensive understanding of the chemistry used in the development of a current technology.

This involves an evaluation of how the chemistry influenced the development of the technology.

This student has explained the chemistry and the reactions occurring that produce iron and steel, including an explanation and evaluation of the involvement of energy in exothermic and endothermic reactions (1). They have explained how the problem of the high titanium and vanadium content is overcome and explained why limestone is used in the reaction (2). There was low-level evaluation of the chemistry of using the reaction between oxygen and limestone and its influence on the development of steel (3).

For a more secure Excellence, the student could write equations for the reactions that produce titanium oxide and calcium oxide (4), and for the reactions between oxygen and limestone (5).

For Merit, the student needs to demonstrate in-depth understanding of the chemistry used in the development of a current technology.

This involves making and explaining links between the chemistry and the development of the technology using chemistry vocabulary, symbols and conventions.

This student has gathered, processed and interpreted information detailing how steel is made at Glenbrook. Information regarding the history is presented which includes the early problems associated with the high content of titanium in the iron sands. Links between the chemistry and development of steel are made and explained by the use of calcium oxide (1), the use of oxygen being blown in both at the top and bottom of the ladle (2), and the use of argon gas (3) and the use of exothermic reactions (4).

To reach Excellence, the student could provide an evaluation of how chemistry influenced the development of steel.

For Merit, the student needs to demonstrate in-depth understanding of the chemistry used in the development of a current technology.

This involves making and explaining links between the chemistry and the development of the technology using chemistry vocabulary, symbols and conventions.

This student has gathered, processed and interpreted information detailing how steel is made at Glenbrook. Information regarding the history is presented which includes the early problems associated with the high content of titanium in the iron sands (1). Links between the chemistry and development of steel is made. There is explanation of the reduction process that is used in the rotary kiln and the use of lime in the process (2).

For a more secure Merit, the student could provide more explanation of the chemistry that is involved in the development of steel production, such as explaining the use of the exothermic reaction that produces CO2 (3).

For Achieved, the student needs to demonstrate understanding of the chemistry used in the development of a current technology.

This involves processing and interpreting information to provide an account of the chemistry used in the development of a current technology using chemistry vocabulary, symbols and conventions. This may also include an account of the historical development of the technology.

This student has outlined some history of the process and used chemistry vocabulary, symbols and conventions (1). They have provided an account of the chemistry used in the development of steel by outlining the problem of high concentrations of titanium oxides and the chemistry used to overcome this as the technology developed (2). The links between chemistry and the development of steel have been made.

To reach Merit, the student could explain the link between the reduction of iron oxides and oxidation process and the development of the technology (3).

For Achieved, the student needs to demonstrate understanding of the chemistry used in the development of a current technology.

This involves processing and interpreting information to provide an account of the chemistry used in the development of a current technology using chemistry vocabulary, symbols and conventions. This may also include an account of the historical development of the technology.

This student has provided an account of the chemistry used in the development of steel and included an account of the history of the process and used some chemistry vocabulary, symbols and conventions (1). They have outlined the problems, namely, the high concentrations of titanium oxides and impurities in iron and described how chemistry was used to solve the problems and develop the production of steel (2). 

For a more secure Achieved, the student could make use of a wider range of chemistry vocabulary, and describe the process in the melter as oxidation, and the process in the rotary kiln as reduction.

For Achieved, the student needs to demonstrate understanding of the chemistry used in the development of a current technology.

This involves processing and interpreting information to provide an account of the chemistry used in the development of a current technology using chemistry vocabulary, symbols and conventions. This may also include an account of the historical development of the technology.

This student has processed and interpreted information and has provided an account of some of the chemistry that is used in the development of steel (1). There is also limited use of chemistry symbols and conventions (1).

To reach Achieved, the student could provide an account of more of the chemistry that is used in the development of steel, such as the reduction process developed in the rotary kiln to remove impurities (2). Also, more chemistry vocabulary could be used