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Questions and Answers
When a piece of wood, paper, and cotton are burnt a new material is formed which is ______ in colour and in powder form.
black
The process of forming a brown layer on the surface of iron articles is called ______.
rusting
To prevent rusting of iron articles, do not allow the iron ______ contact with water or air.
direct
Apply a coat of ______ on the iron article to prevent rusting.
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The type of change which leads to a new substance is known as ______ Change.
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Iron articles like iron nails, iron gates, iron benches or pieces of iron left in the ______ ground for a long time get rusted.
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When iron is exposed to air for a long time, the Oxygen present in air reacts with it in the presence of moist air and forms a new substance called iron oxide as ______ on iron articles.
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This greenish coat is formed when Copper reacts with Oxygen and Carbon dioxide present in the air. This coat also protects Copper from getting further corroded. It is an example of ______.
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In all these cases, the metal is changed to its oxide, forming a new substance. Hence rusting or corrosion is a ______ Change.
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The speed of rusting depends on the amount of moisture and time available to it. That is more the humidity in air, faster is the rusting of iron. The problem of rusting of iron and corrosion of other metal articles are the common experience in almost every home. It spoils beautiful articles and makes them look ugly. The following are some of the ways to prevent the rusting of iron. Changes Around Us ______ ornaments.
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Metals which corroded when ______ of iron?
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You might ha bicycle, metal cycles, white = to steps in cine etc. Do these artic Are all the ab of iron? How can we up of iron c You learnt 'Playing wi magnets he find out w Governmen
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