In an experiment, a student took three iron nails and cleaned their surfaces dry and placed them in three separate test tubes in set-ups A, B and C as shown in the diagram. After three days the nail in set-up A was found to have rusted while the nails in set-ups B and C did not.
Answer the following questions:
(i)
Why was the water in set-up B boiled?
(ii)
Explain the function of the oil on top of the water in set-up B.
(iii)
State the purpose of the rubber stopper in set-up C.
(iv)
Why did the nail in set-up A rust?
(v)
Suggest an aim for the experiment.
(vi)
From the experiment, explain why oil or grease is applied on the surface of a metal to prevent rusting.
In an experiment the surfaces of three iron nails were cleaned dry and placed in three separate test tubes A, B and C as shown in the diagram.
Study the diagram carefully and answer the questions that follow.
After three days the nail in the test tube A was found to have rusted while the nail in test tubes B and C did not rust.
i)
Suggest an aim for the experiment.
ii)
Why was the water in test tube B boiled?
iii)
State the function of the oil on top of the water in test tube B.
iv)
What is the purpose of the calcium chloride in test tube C?
v)
Why did the nail in test tube A rust?
vi)
Why did the nail in test tube
α)
B not rusted?
β)
C not rusted?
vii)
From the experiment, explain why oil is applied on the surface of a metal to prevent rusting.
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