Transcript Session 2 Workshops on Pedagogy and Resources for Learning and Teaching

Workshops on Pedagogy and
Resources for Learning and Teaching
of Sixth Form Chemistry
Session 2
Tryout of Experiments
Display of Teaching Aids
Expt #1 Atomic Spectra

http://solarcenter.stanford.edu/posters.html
 Other Learning Activity 2, p.158
US$8.5 per classroom set of 45
posters plus diffraction gratings
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, [email protected]
Tel. 8106 0660
Sodium Lamp
Direct Vision Spectroscope
Cuvette half-filled with
chlorophyll extract
Image projected by a flexicam
Photo taken by a digital camera
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
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
Plastic Syringe
Carolina
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/fc
100.htm
US$133
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
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
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
Physiotherapy heat pad
IT3, p.17
Crystallization of Supersaturated
Sodium Acetate
Putt Putt Steam Boat
http://www.teachersource.com
Microscale Chemistry Experiments

MC5, p.78
Effects of changes in ionic
concentration on the e.m.f. of
an electrochemical cell
 Microscale preparation of 2chloro-2-methylpropane
MicroChem Combostill
Refluxing Column
Combo-Still Head
Thermometer
Heating Vessel
Reaction Vessel
Microburner
Reflux
Distillation
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
Layout of Expts and Displays
Experiments
In groups of 4-5
Expt #1 → Expt #5 or
Expt #5 → Expt #1
Displays
Workshops Materials
Contact Information
 Mr



[email protected]
[email protected]
Tel. 2762 0944
 Mr


K M Chan
W C HO
[email protected]
Tel. 2712 8476