The Stranger by Santo Casella

1) TEMILINE OF METALS

ZINC
14OO A.D used for
Galvanizing and electrical cells
  * Copper
  * 4200 B.C
  * Used for
  * Wiring and
  * Hot water
  *   Piping
              * LEAD
              * 3500 B.C
              * Used for
              * Pipes and
              * Car batteries

BRASS
2,500 B.C
Used for screws,
Hinges,
Water fittings
And electrical parts  

|

IRON
1500 B.C
Used for
Construction,
Transport
        *

|

SILVER
4000 B.C
Used for
Jewellery
And industrial
Catalysts
Gold
6000 B.C
Used for
Jewellery
And dental

BRONZE
2300 B.C
Used for weapons
And tools
                          * BronzeNC
                          * 14OO A.D used for
                          * Galvanizing and electrical cells
TIN
3000 B.C
Used for
Cans and
Solder
ALUMINIUM
1825 A.D
Used for
Transport,
Electrical,
Consumer durable
|

B) I.
The metals were discovered (roughly) in increasing order of reactivity. Copper, lead, silver and gold can all occur in nature in their elemental form so no smelting and refining is needed. Iron has a high melting temperature which could not be produced with the earlier technology. Aluminum cannot be isolated by pyrometallurgical means. The invention of electricity and electrolysis was needed for its isolation.
Ii) some of the chemical were used because of the properties brass was used because it resistance of corrosion and attract, iron does not rust

C)
| PHYSICAL PROPERTIES | CHEMICAL PROPERTIES |
IRON | Shiny, bright white metal that is soft, malleable, ductile and strong. | Iron dissolves mainly in acids like HCl, HNo3 Iron catches rust in wet air (dump) but not in dry air. Iron is said to be available in 4 different crystalline forms. |
STELL |  high strength, low weight, durability, ductility and corrosive resistance | Resistance corrosion |

D)   Bronze age can be worked at lower temperatures, it's simply an easier metal...