Workshops on Pedagogy and Resources for Learning and Teaching of Sixth Form Chemistry

1. Workshops on Pedagogy and Resources for Learning and Teaching of Sixth Form Chemistry Session 2 Tryout of Experiments Display of Teaching Aids

2. Expt #1 Atomic Spectra • http://solar-center.stanford.edu/posters.html • Other Learning Activity 2, p.158 US$8.5 per classroom set of 45 posters plus diffraction gratings

3. Spectrometer • Diffraction of light by transmission grating • Bragg equation m  = d sin  • m = 0, 1, 2, 3 … • d = distance between lines of grating • http://www.starlab.com/psmain.html • http://www.astro.hk, info@astro.hkTel. 8106 0660 Sodium Lamp

4. Direct Vision Spectroscope Cuvette half-filled with chlorophyll extract Image projected by a flexicam Photo taken by a digital camera

5. Expt #2 A Highly Endothermic Reaction Worksheet • Problem Solving Activity 1, p.84 • Ba(OH)2.8H2O(s) + 2NH4SCN(s)  Ba(SCN)2(s) + 2NH3(g) + 10H2O(l) • The increased number of particles coupled with the change in physical states explains the significant increase in the degree of disorder (entropy) • *use 50 cm3 conical flask • Dispose of in fume cupboard Damp wooden board

6. Expt #3 Equilibria in Carbonated Water • Problem Solving Activity 6, p.102 • When pressure is reduced, the equilibria move to the left, removing H+(aq) ions from the solution • CO2(g) = CO2(aq) • CO2(aq) + H2O(l) = H2CO3(aq) • H2CO3(aq) = H+(aq) + HCO3-(aq) • HCO3-(aq) = H+(aq) + CO32-(aq) • Methyl red indicator (red below pH 4.2 and yellow above pH 6.3) • Please wash the syringe and beaker after use

7. Plastic Syringe Carolina

8. Fuel Cell Car Kit • Using solar energy to electrolyse water to produce hydrogen and oxygen for use in the reversible fuel cell • Reversible: the cell can operate both as fuel cell and as electrolysis agent • http://www.teachersource.com/catalog/add_info/fc100.htm US$133

9. Fuel Cell Car Kit • Proton Exchange Membrane (PEM) fuel cell • Polymer Nafion as the membrane • Car run on blocks or in circle • An item in Reference AL Chemistry F/E List

10. Catalytic Combustor Demo Kit • A honeycomb shaped block of ceramic coated with Pt/Pd • Gently heat the bottom to glow red hot • Extinguish the flame and insert the top of the burner into the bottom of the glass tubing (1 cm) and turn on the gas fuel supply • Red glow of the ceramic indicates that combustion is occurring at 750oC • Bring a lit match over the upper tube opening to demonstrate the complete combustion of fuel • Exhaust systems of automobiles and in flue pipes of modern wood burning stoves US$35

11. Entropy and Rubber band • Problem Solving Activity 1, p.85 • Predict whether the rubber band contracts or expands when heated • G =  – TS • >0; G<0; -TS<0. Therefore, S>0 • The rubber band under its natural state is more disordered than when it is under tension

12. Physiotherapy heat pad IT3, p.17 Crystallization of Supersaturated Sodium Acetate Putt Putt Steam Boat http://www.teachersource.com

13. Microscale Chemistry Experiments • MC5, p.78Effects of changes in ionic concentration on the e.m.f. of an electrochemical cell • Microscale preparation of 2-chloro-2-methylpropane

14. MicroChem Combostill Refluxing Column Combo-Still Head Thermometer Heating Vessel Reaction Vessel Microburner Reflux Distillation

15. Acquisition of Equipment • Make use of the Composite Furniture and Equipment Grant • Via local suppliers: tell them the source of the equipment • Order over the Internet and reimburse

16. Layout of Expts and Displays Experiments In groups of 4-5 Expt #1 → Expt #5 or Expt #5 → Expt #1 Displays

17. Workshops Materials

18. Contact Information • Mr K M Chan • sscchan@netvigator.com • sscchan2000@yahoo.com.hk • Tel. 2762 0944 • Mr W C HO • cdosc21@emb.gov.hk • Tel. 2712 8476