Page 10 - ICSE Chemistry 8
P. 10
Suggested Learning Resources Experimental assembly set up in the lab Charts on prepara on of Hydrogen NaCl, KCl, Na 2 CO 3 , etc. Sugar, water, broken glass rod, burner • Collec on of samples of solu ons, suspensions, colloids Copper sulphate crystals • Soap solu on, clay in water • CaCl 2 les Silica gel pouch in water bo Sodium metal, magnesium ribbon, MgO, CaO • Washing soda Models of structures of diamond and graphite Sample of graphite as an electrode le/R.B. fl ask, delivery bo • Woulff t
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erent chemical • • erent structures.
Suggested Transac onal Processes Preparing hydrogen by the electrolysis of acidifi ed water. • Demonstra ng ac vity to prepare hydrogen by the reac on of Zinc with acid (It is collected by the downward displacement of water as it is lighter than air). • Correla ng the concept of oxida on and reduc on with addi on and removal of oxygen or Explaining the concept by using the example of one student gaining oxygen and the other losing oxygen, thereby ge ng oxidised and reduced, respec vely. Recognising
• • Discussing proper es and uses of hydrogen. removal and addi on of hydrogen. • • Revisi ng earlier concepts. Building on children’s previous learning. • • salts in water. • Diff • • Diff the quan ty of the solute dissolved. • • • • reac vity. • Diff ac vity. ening of • • erent. are diff • • • • collec on by upward displacement of air. • the milkiness disappears. • • • •
Learning Outcomes Students will be able to • describe the prepara on of hydrogen from electrolysis of water; prepare hydrogen in the • lab. using zinc and acid; • describe proper es and uses of hydrogen; correlate concepts of • oxida on and reduc on with addi on and removal of oxygen or removal and addi on of hydrogen. Students will be able to describe that water • dissolves many substances and it is a universal solvent; • iden fy a solu on, suspension and colloid on the ba
• Prepara on of hydrogen,from water – required). • Prepara on of hydrogen in the laboratory. reasons) • Bosch’s process • Proper es and uses of hydrogen • Oxida on and Reduc on Integra on explana on Universal solvent – meaning • Solu ons, suspensions, colloids supersaturated solu ons Suspensions and colloids Water of crystallisa on Hydrated and Anhydrous substances, hygroscopic and steam (with products formed) of hard water Disadvantage of using hard water trea ng with washing soda Al
Key Concepts electrolysis (Introduc on to terms electrode, electrolyte, electrolysis - detailed process not Preference of zinc as the metal to be used (with Choice of dilute acids (other than dil. nitric acid) • Dissolu on of salts in water – meaning and eren ate unsaturated/saturated and • Reac vity of metals with cold water, hot water Hard and so water and methods of so Removing hardness of water by boiling or by Crystalline and amorphous nature of allotropes Uses of diamond, graphite, coke, coal,
Theme 7. Hydrogen • • Physics 8. Water • • Diff • • • • • • • 9. Carbon and Its • Compounds • • •