About chemical displacement and corrosion

1. VIII-CLASS

2. Motivation

3. 1. Which Non-metal is
presented in the diamond?

4. 1. Carbon

5. 2. Which gas is used in
the welding torches?

6. 2. Hydrogen Gas

7. 3. Name the chemical
presents in the tip of
the match stick.

8. 3. Sulphur

9. 4. Name the Non-metal
used in the fire works.

10. 4. Phosphorus

11. 5. Which Non-metal is
used for refrigerating
cells for medical
research?

12. 5. Nitrogen

13. CHAPTER
METALS AND NON-METALS

14. TODAY’S TOPIC’S ARE
1.DISPLACEMENT REACTION
2. CORROSION

15. REACTIVITY SERIES OF METALS

16. NOW THE TOPIC IS
DISPLACEMENT REACTION

17. A MORE reactive metal
displaces a LESS reactive
metal form its salt
solution to form a new
compound is known as
Displacement reaction.

18. REACTIVITY SERIES OF METALS
Iron + Copper Sulphate Iron Sulphate + Copper
Fe + CuSO4 FeSO4 + Cu
EXAMPLE - I

19. REACTIVITY SERIES OF METALS
Copper + Iron Sulphate Copper Sulphate + Iron
Cu +FeSO4 CuSO4 + Fe

20. REACTIVITY SERIES OF METALS
Copper + Iron Sulphate Copper Sulphate + Iron
Cu +FeSO4 CuSO4 + Fe

21. REACTIVITY SERIES OF METALS
Zinc + Copper Sulphate Zinc Sulphate + Copper
Zn + CuSO4 ZnSO4 + Cu
EXAMPLE - 2

22. REACTIVITY SERIES OF METALS
Copper + Zinc Sulphate Copper Sulphate + Zinc
Cu +ZnSO4 CuSO4 + Zn

23. REACTIVITY SERIES OF METALS
Copper + Zinc Sulphate Copper Sulphate + Zinc
Cu +ZnSO4 CuSO4 + Zn

24. REACTIVITY SERIES OF METALS
Zinc + Iron Sulphate Zinc Sulphate + Iron
Zn + FeSO4 ZnSO4 + Fe
EXAMPLE - 3

25. REACTIVITY SERIES OF METALS
Iron + Zinc Sulphate Iron Sulphate + Zinc
Fe +ZnSO4 FeSO4 + Zn

26. REACTIVITY SERIES OF METALS
Iron + Zinc Sulphate Iron Sulphate + Zinc
Fe +ZnSO4 FeSO4 + Zn

27. NOW THE TOPIC IS
CORROSION

28. The process in which metals are
eaten up gradually by the action
of AIR (ATOMSPHERIC GASES),
MOISURE (WATER MOLECULE)
on their surface is known is
CORROSION

29. IRON METAL

31. IRON METAL
Iron reacts with oxygen and moisture (water)
present in the atmosphere to form a brown,
flaky substance called “RUST”
Iron + oxygen + water Iron oxide
Fe + O2 + H2O Fe2O3
( Reddish Brown Colour)

33. SILVER METAL

34. ANKLETS

35. SILVER METAL
Silver reacts with hydrogen sulphide gas
present in the atmosphere to form a
blackened is known as SILVER (I) SULPHIDE.
SILVER+ HYDROGEN SULPHIDE SILVER(I) SULPHIDE + HYDROGEN GAS
Ag + H2 S Ag2S + H2
(Black)

37. COPPER METAL

39. COPPER METAL
Copper reacts with carbondioxde and moisture
present in the atmosphere to form a green
substance called mixture of Copper Hydroxide
and Copper Carbonate.
Copper + oxygen+ water+ carbon dioxide Copper hydroxide + Copper Carbonate
Cu + O2 + H2O + CO2 Cu(OH)2+CuCO3
( Green Coating)

42. Q U I Z

43. COPPER
ZINC
GOLD
SILVER
1._____is used as a protective
coating for iron.

44. BLUE
YELLOW
RED
GREEN
2.__is the colour of copper
sulphate solution.

45. BLUE
YELLOW
RED
GREEN
3.__is the colour of iron
sulphate solution.

46. REDDISH BROWN
4.__is the colour of rust.
REDDISH GREEN
REDDISH BLUE
REDDISH YELLOW

47. HIGHER
5.A metal will only react with a salt solution
if it is placed ___ in the activity series than
the metal in the salt.
MEDIUM
LOWER
NONE OF THESE

48. ANSWERS
(1) D - ZINC
(2) B - BLUE
(3) C - GREEN
(4) A - REDDISH BROWN
(5) A - HIGHER

49. ASSIGNMENT

50. 1.Define displacement
reaction.
2. Define corrosion.
3. Explain corrosion in
Iron, Copper and
Silver metals.

51. THANK YOU