Corrosion

when metals are exposed to the environment they can deteriorate, or break down.Scientists call this process corrosion. Rust is the term used to describe the corrosion of iron.

Investigating Rusting 

Aim: To investigate the factors that cause rusting in iron.

Equipment: Four test tubes, test tube rack,a bung , four iron nails,boiled water,Trap water,salty water,cooking oil,calcium chloride.

Method: 1. Label four test tubes A-D place in test tube rack.

              2.test tubes contents: A=Iron nail and tap water.

                                                B=Iron nail and salty water.

                                                 C=iron nail,boiled water,oil.

                                                 D=Iron nail and calcium chloride.Sealed with a bug.

              3. Leave the test tubes undisturbed for at least three days.

Observations: complete the table.

Test tube                 Conditions present or absent                 Observation

    A                         Water,Air,Oxygen                                 Rusting

    B                         Salt,water and salt                                 Significant Rusting 

    C                         Water,No oxygen                                  No Rusting 

    D                         Oxygen, No oxygen                             No Rusting

Conclusion: Write a conclusion based on your finding. Outline what condition cause the fastest rate of rusting,and what conditions cause the slowest rate of rusting.

Rusting of iron requires water and oxygen .When either of there are remove ,no rusting occurs. The rusting process is sped up when salt is also present.