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Work station III - Physical nature • Equal weight of Calcium Carbonate crystals and powder. • Dilute HCl solution • Conical flask • Delivery tube • Rubber stopper • Thistle Funnel • Measuring cylinder • Water trough • Beehive shelf • Stop watch Copyright © 2007 National Institute of Education - Sri Lanka. All rights reserved. Work station IV - Catalyst • Conical flask • Delivery tube • Hydrogen Peroxide solution • Manganese dioxide/ Sand • Syringe ( glass) • Measuring cylinder • Rubber stopper
Competency 3.0 : Use chemical changes suitable to fulfil necessities of life Competency level 3.6 : Take steps to prevent metal corrosion Activity 3.6 : Let us find ways to conserve metal by minimizing corrosion. Time : 120 mts. Copyright © 2007 National Institute of Education - Sri Lanka. All rights reserved. Quality inputs : • Potassium fericyanide and Phenolpthalein • Small quantity of freshly prepared FeSO 4 and NaOH • 3 copies of artical on instructions for exploration in annex 3.6.1 • 3 work stations arranged according to instructions in annex 3.6.2 • Demy paper and pastel Teaching learning process : • Inquire about their precious knowledge on rusting of iron. • Add to the freshly prepared FeSO4 solution a few drop of potassium ferricyanide and a few drop of phenolpthalien to NaOH solution and show the students. • Lead a discussion highlighting the following points. • Rusting is due to water and Oxygen reacting with Iron • Acids and salts increase rusting where as bases retard rusting. • Initial reactions during rusting could be given as follows. Fs (s) Fe 2+ + 2e (Oxidation) (aq) 2H 2 O (l) + O 2(g) + 4e 4OH - (reduction) (aq) • When Potassium fericyanide is added to a solution of Fe 2+ solution there is a deep blue colours. • Potassium ferricyanide could be used as an indicator to detect Fe 2+ ions in a medium. • When Phenolphthalein is added to a solution containing (OH) - there is a pink colour. • Phenolphthalein could be used as an indicator to detect (OH) - ions in a medium. (15 mts.) Step 3.6.2 : • Divide the class into four groups. • Provide the groups with instrutiions for exploration, demy papers and pastels. • Assign the tasks and engage the groups in exploration. • Prepare them to present their findings to the whole class (60 mts)
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SCIENCE Teacher Instruction Manual
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Message of the Director General The
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Time has been allocated for activit
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Direction: Prof. J W Wickremasinghe
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Competency 1.0 ( Investigates Scien
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Criteria for assessment and evaluat
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Copyright © 2007 National Institut
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Chadwick showed that when α Partic
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Competency 1.0 ( Investigates Scien
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² Relative atomic mass=mass of an
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"Looking at an atom with an explora
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Atomic Number The atomic number of
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25 17 17 19 19 19 20 20 20 20 20 20
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Annex 1.3.4 Chemical bonds Ionic bo
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