Workshops on Pedagogy and Workshops on Pedagogy and Resources for Learning and Teaching Resources for Learning and Teaching

of Sixth Form Chemistryof Sixth Form Chemistry

Session 2Session 2Tryout of ExperimentsTryout of Experiments

Display of Teaching AidsDisplay of Teaching Aids

Expt #1 Atomic SpectraExpt #1 Atomic Spectra http://solar-center.stanford.edu/phttp://solar-center.stanford.edu/p

osters.htmlosters.html

Other Learning Activity 2, p.158Other Learning Activity 2, p.158

US$8.5 per classroom set of 45 posters plus diffraction gratings

SpectrometerSpectrometer Diffraction of light by transmission gratingDiffraction of light by transmission grating Bragg equation m Bragg equation m = = dd sin sin

m = 0, 1, 2, 3 …m = 0, 1, 2, 3 … d = distance between lines of gratingd = distance between lines of grating

http://www.starlab.com/psmain.htmlhttp://www.starlab.com/psmain.html http://www.astro.hkhttp://www.astro.hk, , info@astro.hkinfo@astro.hk

Tel. 8106 0660Tel. 8106 0660Sodium Lamp

Direct Vision SpectroscopeDirect Vision Spectroscope

Photo taken by a digital cameraImage projected by a flexicam

Cuvette half-filled with chlorophyll extract

Expt #2 A Highly Endothermic ReactionExpt #2 A Highly Endothermic Reaction

PProblem Solving Activity roblem Solving Activity 1, p.841, p.84 Ba(OH)Ba(OH)22.8H.8H22O(s) + 2NHO(s) + 2NH44SCN(s) SCN(s)

Ba(SCN)Ba(SCN)22(s) + 2NH(s) + 2NH33(g) + 10H(g) + 10H22O(l)O(l) The increased number of particles coupled with The increased number of particles coupled with

the change in physical states explains the the change in physical states explains the significant increase in the degree of disorder significant increase in the degree of disorder (entropy)(entropy)

*use *use 5050 cm cm33 conical flask conical flask Dispose of in fume cupboardDispose of in fume cupboard

Worksheet

Damp wooden board

Expt #3 Equilibria in Carbonated WaterExpt #3 Equilibria in Carbonated Water

Problem Solving Activity 6, p.102Problem Solving Activity 6, p.102 When pressure is reduced, the equilibria move to When pressure is reduced, the equilibria move to

the left, removing Hthe left, removing H++(aq) ions from the solution(aq) ions from the solution COCO22(g) (g) == CO CO22(aq)(aq) COCO22(aq) + H(aq) + H22O(l) = HO(l) = H22COCO33(aq)(aq) HH22COCO33(aq) = H(aq) = H++(aq) + HCO(aq) + HCO33

--(aq)(aq) HCOHCO33

--(aq) = H(aq) = H++(aq) + CO(aq) + CO332-2-(aq)(aq)

Methyl red indicatorMethyl red indicator (red below pH 4.2 and yellow above pH 6.3) (red below pH 4.2 and yellow above pH 6.3)

Please wash the syringe and beaker after usePlease wash the syringe and beaker after use

Plastic SyringePlastic Syringe

Carolina

Fuel Cell Car KitFuel Cell Car Kit Using solar energy to Using solar energy to

electrolyse water to electrolyse water to produce hydrogen and produce hydrogen and oxygen for use in the oxygen for use in the reversible fuel cellreversible fuel cell

Reversible: the cell can Reversible: the cell can operate both as fuel cell operate both as fuel cell and as electrolysis agentand as electrolysis agent

http://www.teachersourcehttp://www.teachersource.com/catalog/add_info/fc.com/catalog/add_info/fc100.htm100.htm US$133

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

Catalytic Combustor Demo KitCatalytic Combustor Demo Kit A honeycomb shaped block of ceramic A honeycomb shaped block of ceramic

coated with Pt/Pdcoated with Pt/Pd Gently heat the bottom to glow red hotGently heat the bottom to glow red hot Extinguish the flame and insert the top of the Extinguish the flame and insert the top of the

burner into the bottom of the glass tubing (1 burner into the bottom of the glass tubing (1 cm) and turn on the gas fuel supplycm) and turn on the gas fuel supply

Red glow of the ceramic indicates that Red glow of the ceramic indicates that combustion is occurring at 750combustion is occurring at 750ooCC

Bring a lit match over the upper tube Bring a lit match over the upper tube opening to demonstrate the complete opening to demonstrate the complete combustion of fuelcombustion of fuel

Exhaust systems of automobiles and in flue Exhaust systems of automobiles and in flue pipes of modern wood burning stovespipes of modern wood burning stoves

US$35

Entropy and Rubber bandEntropy and Rubber band

Problem Solving Activity 1, p.85Problem Solving Activity 1, p.85 Predict whether the rubber band Predict whether the rubber band

contracts or expands when heatcontracts or expands when heateded

GG = = – – TTSS >>0; 0; GG<0; -<0; -TTSS<<00. .

Therefore, Therefore, S>0S>0 The rubber band under its naturThe rubber band under its natur

al state is more disordered than al state is more disordered than when it is under tensionwhen it is under tension

Physiotherapy heat padPhysiotherapy heat pad

Putt Putt Steam Boathttp://www.teachersource.com

Crystallization of Supersaturated Sodium Acetate

IT3, p.17

Microscale Chemistry ExperimentsMicroscale Chemistry Experiments

MC5, p.78MC5, p.78Effects of changes in ionic coEffects of changes in ionic concentration on the e.m.f. of an ncentration on the e.m.f. of an electrochemical cellelectrochemical cell

Microscale preparation of 2-cMicroscale preparation of 2-chloro-2-methylpropanehloro-2-methylpropane

MicroChem CombostillMicroChem Combostill

Reaction VesselReaction Vessel

ThermometerThermometer

Heating VesselHeating Vessel

Refluxing ColumnRefluxing Column

MicroburnerMicroburner

Combo-Still HeadCombo-Still Head

Reflux Distillation

Acquisition of EquipmentAcquisition of Equipment

Make use of the Composite Furniture and Make use of the Composite Furniture and Equipment GrantEquipment Grant

Via local suppliers: tell them the source of Via local suppliers: tell them the source of the equipmentthe equipment

Order over the Internet and reimburseOrder over the Internet and reimburse

Layout of Expts and DisplaysLayout of Expts and Displays

Displays

Expt #1 → Expt #5 or

Expt #5 → Expt #1

ExperimentsIn groups of 4-5

Workshops MaterialsWorkshops Materials

Contact InformationContact Information

Mr K M ChanMr K M Chan sscchan@netvigator.comsscchan@netvigator.com sscchan2000@yahoo.com.hksscchan2000@yahoo.com.hk Tel. 2762 0944Tel. 2762 0944

Mr W C HOMr W C HO cdosc21@emb.gov.hkcdosc21@emb.gov.hk Tel. 2712 8476Tel. 2712 8476