sains

8. Modul :
c. Iron rust due to the exposure to air and water
D.
1.To investigate the relationship between the presence of water and air with the rusting of nails.
2.Nail Q has rusted because is exposed to water and air
3
a.Presence of water and air
b.Nail condition
4.To absorbs water.
5.Rusting occurs when iron and steel are exposed to water and air

9. a.
1.Apply paint
2.Apply greese
3.Coat with non rusty materials such as aluminium or copper
B.
1.Last longer
2.Clean and beautiful
3.Safe to be used

10. 1.Iron nail P not rusted,iron nail Q has rusted.
2.
a.Types of liquid in the beaker
b.Condition of iron nails after 2 weeks.
c.
1. To investigate rusty and non rusty objects
3.Water and air

11. A
1.Applying grease
2.Plating with non iron metal
3.Applying paint
2.
a.Painting
b. non iron metal
c.grease
3
a.last longer
b.costs