METALS

1. Write two ores of iron.
- The two ores of iron are Hematite (Fe2O3) and Magnetite (Fe3O4).

2. Write any two physical properties of iron.
- The two physical properties of iron are:
a. Its specific gravity is 7.86.
b. It's M.P is  about 1500ºC and B.P is about 2500ºC.

3. What is atomic weight of iron? Define rusting.
- The atomic weight of iron is 56. Rusting is defined as the process of formation of hydrated iron oxide when iron comes in contact with moist air.
  4Fe +3O2 + 3H20-------- 2Fe2O3.3H2O

4. Write two uses of iron.
- The two uses of iron are:
a. It is used in construction of buildings, bridges etc.
b. It is used in manufacture of steels.

5. Write two ores of Aluminium and its atomic weight.
 - The two ores of aluminium are Bauxite ( Al2O3.2H20) and Felspar ( KAlSi3.O8). It's atomic weight is 27.

6. Write any two uses of Aluminium.
- The two uses of Aluminium are:
a. It is used to wrap food materials.
b. It is used to make parts of aeroplanes and light equipment.

7. Write two properties of Al.
- The two properties of Al are as follows:
a. It's specific gravity is 2.7.
b. It's M.P is 660ºC and 1800ºC.

8. Why is aluminium used to make aeroplanes?
- Aluminium is used to make aeroplanes because it is lighter metal and doesn't corrodes as easily as iron.

9. Name any two ores of copper.
- The two ores of copper are  Chalcopyrite (CuFeS2) and Chalcocite (Cu2S).

10. Why is copper used to make electric wires?
- Copper is used to make electric wires because it is good conductor of electricity.

11. Write two uses and properties of copper.
-  The two uses of copper are:
a. It is used to make electric wires.
b. It is used to make alloys, coins and utensils.
- The two properties of copper are:
a. It's specific gravity is 8.95.
b. It's M.P is 1083ºC and 2350ºC.

12. Write two ores of silver with atomic weight.
- The two ores of iron are Argentite (Ag2S) and Horn silver (AgCl). It's atomic weight is 107.88.

13. Write two properties and uses of silver.
 - The two properties of silver are:
a. It's specific gravity is 10.5.
b. It's M.P is 960ºC and 1955ºC.
- The two uses of silver are:
a. It is used in electroplating and making coins.
b. Silver bromide is used in photography.