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Experiments

Experiments. Choice of experiments. Glance through the curriculum and assessment guide E.g. Topic VII Redox Reactions, Chemical Cells and Electrolysis. Choice of experiments. Topic VIII Chemical Reactions and Energy. Assessment to be made.

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Experiments

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  1. Experiments

  2. Choice of experiments • Glance through the curriculum and assessment guide • E.g. Topic VII Redox Reactions, Chemical Cells and Electrolysis

  3. Choice of experiments • Topic VIII Chemical Reactions and Energy

  4. Assessment to be made • Their written worksheets / reportsand the quiz before the experiment is performed • If possible and manageable, practical skills • Class size (Can ALL get involved?) • Safety first • Bench tidiness

  5. Worksheet / Report ? • When to submit? • Time table arrangement (> or < 2 hours) • Class size • School culture • To mark them, consider holistic approach

  6. Marking criteria

  7. Marking criteria

  8. Marking criteria

  9. Marking criteria

  10. Example: Preparation of salt • Topic in NSS curriculum • Topic IV: Acids and Salts • Total number of periods • 2 × 40 minutes

  11. Example: Students’ manual

  12. Example: Students’ manual

  13. Example: Students’ manual

  14. Example: Students’ manual

  15. Example: Students’ manual

  16. Example: Students’ manual

  17. Example: Quiz • Classify the following substances into acids, bases and salts. • Classify the salts into the soluble category and the insoluble category. • Use only those chemical reagents listed in question 1, write chemical equations for the preparation of barium sulphate and magnesium sulphate-7-water

  18. Example: Quiz

  19. Example: Experimental worksheet • Worksheet (to be completed in the lessons) • What is the objective of the experiment? • What do you observe when you mix • barium chloride solution with sodium • sulphate solution? • 3. Write chemical equation(s) for this experiment. • 4. Work out the theoretical mass of the salt • that should be obtained. • 5. What is the purpose of washing the residue • with deionized water? • 6. Record your results • Mass of weighting bottle = _______ g • After 1 week, • Mass of weighting bottle + barium sulphate • = _______ g • Mass of barium sulphate = _______ g • What is the mass percentage yield • of barium sulphate? • Basically, answer questions raised in the manual.

  20. Example: Experimental worksheet

  21. Example: Full Report

  22. Example: Full Report

  23. Example: Report

  24. Example: Full Report

  25. Example: Full Report

  26. Example: Full Report

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