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TKI Chemistry Assessment Resources

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For Excellence, the student needs to carry out a comprehensive practical chemistry investigation with direction.

This involves:

• justifying the choices made to increase accuracy during the investigation
• justifying the conclusion in terms of the processed data and the purpose of the investigation
• relating investigation findings to applicable chemistry ideas.

This student has carried out a comprehensive practical investigation by controlling variables, and has justified the choices made to increase the accuracy of the measured values (1). Data has been processed and represented to enable a conclusion to be reached. The conclusion is justified in terms of the processed data and the purpose of the investigation. The discussion on the reliability of results is also sufficient (3).

For a more secure Excellence, the student could discuss the chemistry ideas more comprehensively. Reference should be made to particles. Reasons for successful collisions are required (2).

For Merit, the student needs to carry out an in-depth practical chemistry investigation with direction.

This involves:

• developing a procedure for collecting primary data, with units, relevant to the purpose, based on the manipulation of the independent variable over a valid range of values, with repetition to show reliability
• controlling the variable(s) that could have a significant effect on the results
• using techniques to increase the accuracy of the measured values of the dependent (and independent) variable
• processing and representing the data to enable a conclusion to be reached
• writing a conclusion based on the processed data that links to the purpose of the investigation.

This student has carried out an in-depth practical investigation by sufficiently controlling variables that could have a significant effect on the results (1). There is sufficient discussion about using techniques to increase the accuracy of the measured values of the dependent (and independent) variable, and about the reliability of the results (2). Data has been processed and represented in a way that enables a conclusion to be reached. The conclusion is based on the processed data, and it links to the purpose of the investigation.

To reach Excellence, the student could relate investigation findings to applicable chemistry ideas in the discussion.

For Merit, the student needs to carry out an in-depth practical chemistry investigation with direction.

This involves:

• developing a procedure for collecting primary data, with units, relevant to the purpose, based on the manipulation of the independent variable over a valid range of values, with repetition to show reliability
• controlling the variable(s) that could have a significant effect on the results
• using techniques to increase the accuracy of the measured values of the dependent (and independent) variable
• processing and representing the data to enable a conclusion to be reached
• writing a conclusion based on the processed data that links to the purpose of the investigation.

This student has collected primary data, with correct units, relevant to the purpose, based on manipulation of the independent variable over a valid range of values, with repetition to show reliability (1). Data has been processed and represented to enable a conclusion to be reached. The conclusion is based on processed data, and it links to the purpose of the investigation (3).

For a more secure Merit, the student could correctly process the data (2). The student could also discuss controlling variables that could have a significant effect on the results, and to discuss the techniques used to increase the accuracy of the measured values of the dependent (and independent) variable in more detail (4).

For Achieved, the student needs to carry out a practical chemistry investigation with direction.

This involves:

• developing a method for collecting primary data with units, relevant to the purpose, based on the manipulation of the independent variable over a range of values
• processing and representing the data in an appropriate way (graph, table, calculation e.t.c.)
• writing a conclusion based on the processed data.

This student has collected primary data with units, relevant to the purpose, based on the manipulation of the independent variable for three values of the independent variable (1). Data has been processed and represented to enable a conclusion to be reached. The conclusion is based on processed data (2). There is discussion on controlling variables that could have a significant effect on the results (3).

To reach Merit, the student could write a conclusion that links the processed data to the purpose of the investigation.

For Achieved, the student needs to carry out a practical chemistry investigation with direction.

This involves:

• developing a method for collecting primary data with units, relevant to the purpose, based on the manipulation of the independent variable over a range of values
• processing and representing the data in an appropriate way (graph, table, calculation e.t.c.)
• writing a conclusion based on the processed data.

This student has developed a method for collecting primary data with units, relevant to the purpose, based on manipulation of the independent variable over a range of values (1). The data collected from the investigation is represented appropriately (2). Conclusion is based on processed data (4).

For a more secure Achieved, the student could use the correct unit for time (3).

For Achieved, the student needs to carry out a practical chemistry investigation with direction.

This involves:

• developing a method for collecting primary data with units, relevant to the purpose, based on the manipulation of the independent variable over a range of values
• processing and representing the data in an appropriate way (graph, table, calculation e.t.c.)
• writing a conclusion based on the processed data.

This student has developed a method for collecting primary data with units, relevant to the purpose, based on manipulation of the independent variable over a range of values (1). The data collected from the investigation is represented (2). Conclusion is based on processed data (3). 

To reach Achieved, the student could represent data (time) with the correct units (2).