2. The Chinese University of Hong Kong

3. The teaching of chemistry

4. Educational Communication and Technologies The teaching of chemistry Cheung Chun Yeung S96075240 Cheung Kit Ling S96031350 Chung King Yuen S960408

5. Uses of common metals + A. Metals in our daily life + B. Properties of metals + C. Price of metals + D. Choosing metals + E. Structure of metals + F. Conservation of metal & recycling

6.  Metals are very important in our daily life. Metals in our daily life Metals in our daily life Really ?

7. metal can fly on the sky Metals in our daily life Metals in our daily life  Titanium is used to build flight.

8. Metals in our daily life Metals in our daily life  Iron is commonly used nowadays.

9. Metals in our daily life Metals can be used to make space shuttle.

10. Properties of metals  1. Common properties  2. Special properties Pop Pop tea ?

11. Common properties of metals  Metals conduct electricity.

12. Conduction of electricity

13. Common properties of metals  Metals conduct heat.

14. Conduction of heat

15. Common properties of metals  Metals are shiny. Gold Silver

16. Common properties of metals  Most metals are malleable. I can make a metal pizza.

17. Malleability  Metals can be made into different shapes

18. Common properties of metals  Most metals are ductile. copper wire copper block

19. Special properties of metals  Some metals have lower density. less dense metal floats on water Welcome to the sea. denser metal sinks in water Iron Sodium

20. Special properties of metals  Some metals are stronger. Iron : Ho Ho ! I am strong. copper : Oh! I am not.

21. Special properties of metals  Some metals have higher melting points. copper silver melting point = 1084 o Cmelting point = 660 o C

22. Other special properties  resist corrosions  toxicity

23. . The price of metals depends on. the abundance of metals. the cost of extraction. other factors (e.g. war, economy) Price of metals

24.  The cost of extraction of aluminium is too high. important factor

25. Price of metals We want...  Supply and demand We want to build shipI want to build ship Africa Australia Italy South America I want to build ship Japan Canada I want to build ship

26. Price of metals SupplyPrice High Demand Low High Supply and demand of iron

27. Price of metals Low SupplyPrice High Demand Low Supply and demand of copper

28. Choosing metals metal with low density more ductile metal stronger metal  Properties of metals

29. Choosing metals  Price of metals

30. Choosing metals

31.  giant metallic bond  delocalized moving electrons - 'sea of electrons'  free electrons move throughout the lattice  structure affects properties Structure of metals electrons ion

32. Conduction of electricity  movement of the free electrons e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

33. Conduction of heat u Heat is conducted by u the movement of delocalized electrons. u the vibration of the atoms and electrons. e-e- e-e- e-e- e-e- e-e-

34. Malleable and ductile  atoms arranged in layers.  the layers can slip over each other.

35. Uses of metals This is the end of the presentation. Bye !