1. Assessment for Learning in AL & ASL Chemistry Through TAS Chan Kam Yuen TWGHs Mrs Wu York Yu Memorial College/ EDB Seconded Teacher 05-06

2. New AL syllabus Starts from year 05-06 Starts from year 05-06 No phase equilibrium No phase equilibrium Mechanistic base learning in Organic Chemistry Mechanistic base learning in Organic Chemistry No Chemistry and Society No Chemistry and Society Add Chemistry in Action Add Chemistry in Action –Drug Chemistry & Green Chemistry

3. Resources Book for Sixth-Form Practical Chemistry

4. TAS Handbook 5 main areas of assessment (Form 902) 5 main areas of assessment (Form 902) –(a) Methodical Working –(b) Experimental Technique –(c) Manual Dexterity –(d) Orderliness –(e) Skill in Observations

6. Assessment in Synthesis Expt. Expt 4: Synthesis of Ferrate(VI) ions Expt 4: Synthesis of Ferrate(VI) ions Ferrate(VI) FeO 4 2- consists of iron in the +6 oxidation state. It is an environmental friendly but powerful oxidising and disinfecting agent. It can oxidise harmful organic and inorganic species. Ferrate(VI) FeO 4 2- consists of iron in the +6 oxidation state. It is an environmental friendly but powerful oxidising and disinfecting agent. It can oxidise harmful organic and inorganic species.

7. Synthesis of Ferrate(VI) ions Part A: Preparation of FeO 4 2- Part A: Preparation of FeO 4 2- Part B: Oxidation of organic and inorganic pollutants Part B: Oxidation of organic and inorganic pollutants

8. (a) Methodical Working A pre-written experiment with experimental procedure (any planning??) A pre-written experiment with experimental procedure (any planning??) Procedure is carried out in a correct sequence Procedure is carried out in a correct sequence Equipment is utilized effectively and purposefully Equipment is utilized effectively and purposefully –mortar & pestle and filtration apparatus Time available is managed efficiently (at most 1 hour) Time available is managed efficiently (at most 1 hour)

9. (b) Experimental Technique Experimental apparatus are handled correctly. Experimental apparatus are handled correctly. Operations (filtration) is carried out correctly and efficiently. Operations (filtration) is carried out correctly and efficiently. Chemicals are handed in a safe manner (NaOH pellets, bleaching water). Chemicals are handed in a safe manner (NaOH pellets, bleaching water).

10. (c) Manual Dexterity Practical task is executed in a swift, confident and assured manner (observe and communicate) Practical task is executed in a swift, confident and assured manner (observe and communicate) Operation is successfully completed. (It can be succeed) Operation is successfully completed. (It can be succeed)

11. (d) Orderliness Working area is kept clean and tidy. Working area is kept clean and tidy. Bench space is fully utilized. Bench space is fully utilized. Equipment is placed in an organized way. Equipment is placed in an organized way. (General Impression)

12. (e) Skill in Observation Student ’ s oral report on their findings, made simultaneously with the observation or immediately following the event, attains a reasonable standard. Student ’ s oral report on their findings, made simultaneously with the observation or immediately following the event, attains a reasonable standard.

13. Part A: Preparation of FeO 4 2- Add 10 cm 3 of bleaching water in a 100- cm 3 beaker. – –(b) Handle bleach water in a safe manner Grind NaOH pellets into powder and add 3 g of it to the beaker with stirring. – –(b) Handle NaOH in a safe manner – –(b) Mortar & Pestle is handled correctly

14. When most of the NaOH powder dissolves and the mixture remains hot, add 5 drops of 0.3 M FeCl 3 solution with stirring for a few seconds. – –(e) Skill in observation (record immediately?)

15. Add 2 g of NaOH powder into the reaction mixture. –(a) Procedure is carried out in a correct sequence (miss or mix up with other steps) Allow the reaction mixture to cool down –(a) Procedure is carried out in a correct sequence (without waiting)

16. Place a small amount of cotton wool into a dropper. Filter the reaction mixture through the dropper with cotton wool. –(a) equipment is utilized effectively and purposefully (dropper enough?) –(b) operations is carried out correctly and efficiently –(c) operation is successfully completed –(e) skill in observation

17. Some photos

18. Part B: Oxidation of organic and inorganic pollutants Test 1: Add ~2 cm 3 of absolute or normal ethanol to a test tube containing 2 cm 3 of the filtrate collected in Part A. Record your observations. Test 2: Add a few drops of the filtrate collected in Part A to a test tube containing 2 cm 3 of 2 M H 2 SO 4 solution. Record your observations. – –(e) Skill in observation

19. Oxidation of ethanol ethanol

20. Oxidation of KI Kll2l2

21. Some remarks Fully understand the principles and sequences of experiment Fully understand the principles and sequences of experiment Think in detail about each step (requirement and technique) Think in detail about each step (requirement and technique) Understand common mistakes of students Understand common mistakes of students