A) describe an experiment to show the conditions necessary for rusting of iron.
Answers
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 its surface is protected by a layer of aluminium oxide.
The following experiment investigates the conditions necessary 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 has 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 nails 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.
Answer:
Two conditions of rusting of iron are - Air and Water
Explanation:
Iron rusting - Rusting of iron takes place in the presence of moisture and air. The Two conditions which are necessary for rusting of iron are as follows-
- Air
- Water
Rust is an iron oxide, which is usually a reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of-
1. hydrous iron
2.oxides and iron
3.oxide-hydroxide
and this is typically associated with the corrosion of refined iron.
Rust forms when an iron or its alloys are exposed to moist air. The oxygen and water when gets contact with the air react with the metal to form the hydrated oxide. The familiar red form of rust is (Fe2O3), but iron has other oxidation states, so it can also form other colors of rust.
The following experiment investigates the conditions which are necessary for rusting to occur.
Fill up test tubes as follows:
Test tube A- It is filled with boiled water and an oil layer where no presence of oxygen.
Test tube B -It contains calcium chloride which will dry the air.
Test tube C - It has regular tap water(normal)that has oxygen.
Place an iron nail in each of the three test tubes A, B, C.
Cover A, B, C each test tube and let it stand for a couple of days.
After that Compare the conditions of the nails in each test tube.
observation: the iron nail of only test tube C get rusts deposited because it was exposed to oxygen and moisture.
conclusion: so, the oxygen and moisture cause rusting.
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