PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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We come across many iron articles around us. Iron is used in making bridges, ships, cars, truck bodies, grills in windows, etc.
 
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Rusted iron chains
Iron turns into rust when exposed to air and moisture in the atmosphere. 
Rusting is an example of  a chemical change where the process cannot be reversed, and a new substance is formed. This is also called as a chemical reaction. Rusting becomes faster when there is humidity and high salt content in water.
 
Iron+Oxygen+WaterIronoxide(rust)Fe+O2+H2OFe2O3
 
Prevention:
 
1. Frequent coating of paint or grease on iron articles slower the process of rusting.ru2.jpg
Coating iron ship with paint
 
2. Galvanisation (depositing a layer of zinc on iron).
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Galvanised iron sheets
 
3. Alloy (mixing iron with other metals).
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Gold chain mixed with other metals
 
The iron galvanized pipes are used in our homes to carry water to prevent rusting. Ships suffer a lot of damage from rusting so to prevent its damage, stainless steel is made by mixing iron with carbon and metals like chromium, nickel and manganese.
 
rust.jpg
Rusted iron ships