This document discusses rusting of iron nails when exposed to water and air. It describes an experiment where one nail was placed in water and exposed to air, causing it to rust, while another nail that was not exposed to water did not rust. It also lists several methods to prevent rusting of iron objects like applying paint, grease or coating them with non-rusting metals like aluminum or copper. These preventative measures help iron objects last longer.

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