Question

Explain an experiment to show the conditions necessary for rusting of iron(diagram will attract more marks)

Answer 1

Answer:

Iron and steel rust when they come into contact with water and oxygen. They rust faster in salty water or acid rain. Aluminium, on the other hand, does not corrode easily, because it's surface is protected by a layer of aluminium oxide.

The following expreiment investigates the conditions neccessary for rusting to occur.

Fill up test tubes as follows:

• Test tube A is filled with boiled water and an oil layer so that there is no oxygen.
• Test tube B has calcium chloride which will dry the air.
• Test tube C will have regular tap water that has oxygen.
• Place an iron nail in each of the three test tubes.
• Cover each test tube and let it stand for a couple of days.
• Compare the conditions of the nail in each test tube.

Observation:

                         The iron nail of only test tube C rusts because it was exposed to oxygen and moisture.

Conclusion:

                         Oxygen and moisture cause rusting.

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