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A/AS level Chemistry TAS

A/AS level Chemistry TAS. Workshop for Teachers 18 October 2007. Teacher Assessment Scheme. Practical paper of the A/AS level Chemistry Examination 20% of the subject mark Compulsory to all school candidates (including first-timers and repeaters)

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A/AS level Chemistry TAS

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  1. A/AS level Chemistry TAS Workshop for Teachers 18 October 2007

  2. Teacher Assessment Scheme • Practical paper of the A/AS level Chemistry Examination • 20% of the subject mark • Compulsory to all school candidates (including first-timers and repeaters) • Private candidates : either (i) use previous TAS result , or (ii) take practical exam

  3. TAS allows: • better link between theory and practical work • students to experience a wider range of experimentation • the assessment of a full range of practical abilities • reduction in examination pressure • teachers to provide frequent feedback to students • increase in teachers’ professionalism

  4. Requirements of TAS • Lab work should cover different areas and types of experiment Area : CH, EQ, KI & EN Type: P, QL and QN

  5. Requirements of TAS(cont’d) • Number of experiments A-level 15 experiments in S6 8 experiments in S7 AS-level 13 experiments in 2 years

  6. Ability area A Ability area B Ability area C Manipulative skills, skills in observation and general bench performance Presentation of data, interpretation of results, planning of experiments and project work attitude towards practical chemistry Requirements of TAS(cont’d)

  7. Minimumrequirement for each candidate A-level (First-timer)

  8. Minimumrequirement for each candidate AS-level (First-timer)

  9. Repeaters & transferred candidates in TAS • Students who join S7 chemistry classes directly in the year of repetition or transfer. • Ignore all their previous TAS marks or practical examination marks. • Make assessment as follows: A-level : minimum 3A, 3B and 1C AS-level : minimum 2A, 2B and 1C

  10. Making assessments • Assess each student sufficiently on each ability. • Not necessary to assess all students on the same day and on the same experiment. • Assess as unobtrusively as possible.

  11. Making assessments (cont’d) • Assess on a 10-point scale: 10-9 very good 8-7 good 6-5 average 4-3 weak 2-1 very weak (Refer to Appendix III of TAS Handbook.)

  12. Making assessments (cont’d) 3 ways for allocation of marks: (i) Mark Scheme (ii) Impression (iii) Overall impression over a longer period of time, for a particular area e.g. area C

  13. Project work in TAS Not compulsory Involve practical work and experimental investigation Include: designing experiment performing the investigation writing the report

  14. Project work in TAS (cont’d) • One project = max. 3 experiments • For each student, each project can be used to assess 1A & 1B only

  15. Lab reports • Language medium used must be the same as that chosen for the written exam. • Detailed reports: object of expt, chemical principles involved, experimental method, results, interpretation and discussion, conclusion. First-timers: 4 for AL and 3 for ASL Repeaters: 2 for AL and 1 for ASL • All reports should be marked.

  16. Information about TAS: • Refer to Handbook on the A/AS Chemistry Teacher Assessment Scheme • HKEAA website: www.hkeaa.edu.hk • Enquiry: 36288068 (Ms Tansy Chun) 36288025 (Mr CW Pau)

  17. Reminder Always consult your group coordinators when you have queries or problems

  18. Common problems reported by coordinators

  19. (1) Unclear experiment titles • E.g. (i) Project 1 (ii) To prepare a carboxylic acid • Titles entered in the TAS assessment records should be informative and specific.

  20. (2) Insufficient no. of preparative experiments • Experiments indicated as P are not preparative experiments. Preparative experiments should involve techniques such as: handling of gases, filtration, crystallization, recrystallisation, distillation, reflux, drying, liquid-liquid extraction, purity control by determining melting point / boiling point. A minimum of 2 P experiments should be carried out. (TAS Handbook)

  21. (3) Mark range too narrow / too wide • For each candidate, the mark awarded should reflect the typical standard of the candidate. • For the whole class, the marks awarded should be able to discriminate candidates with different abilities.

  22. (4) Teacher changes • Best to have more than one teacher familiar with the Scheme • Out-going teacher to hand over his/her work on TAS to new teacher, including: • List of experiments and their handouts • Records of TAS marks awarded to students e.g. printouts of software • TAS program, its passwords, and backup diskettes, if any • Inform coordinator of the change

  23. (5) Mark Adjustment • Rank order of students in a class will be preserved. • Adjusted TAS mean marks calculated from Written Paper mean marks. • TAS marks will be shifted upwards/downwards. • SD of TAS marks will be preserved.

  24. Skills to be tested in GCE A Level Science Subjects • P – Planning • I – Implementation • A – Analysing Evidence and Drawing Conclusions • E – Evaluating Evidence and Procedures

  25. Questions & Answers

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