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

US8.5 per classroom set of 45 posters plus
diffraction gratings
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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_at_astro.hkTel. 8106 0660

Sodium Lamp
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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
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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

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Plastic Syringe
Carolina
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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/fc10
  0.htm

US133
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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

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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

US35
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Entropy and Rubber band

• Problem Solving Activity 1, p.85
• Predict whether the rubber band contracts or
  expands when heated
• ?G ?? T?S
• ??gt0 ?Glt0 -T?Slt0. Therefore, ?Sgt0
• The rubber band under its natural state is more
  disordered than when it is under tension

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

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

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Layout of Expts and Displays
Experiments In groups of 4-5
Expt 1 ? Expt 5 or Expt 5 ? Expt 1
Displays
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Workshops Materials
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Contact Information

• Mr K M Chan
• sscchan_at_netvigator.com
• sscchan2000_at_yahoo.com.hk
• Tel. [phone]
• Mr W C HO
• cdosc21_at_edb.gov.hk
• Tel. [phone]