Post on 17-Dec-2015
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