Rusting is a chemical change. Rusting of Iron is the formation of a reddish-brown coating on the surface of the metal and its alloys due to the action of moisture and air over a long period. This phenomenon is a chemical change as Iron combines with Oxygen in presence of water to form a new compound, Iron oxide. This weakens the bonds between the atoms of Iron in the structure and as a result, rusted iron loses its desirable properties.
Prevention:
Galvanization :- In the process of Galvanization, iron is covered with a protective layer of zinc to prevent its oxidation or rusting.
Use of Alloy :-The rusting can be slowed down by using iron alloys like stainless steel.
Coating :- Good quality paint or oil coating is used to form a protective layer on the surface of iron material which inhibits moisture or water from reaching the iron and chemical reaction between them. Hence, painting or oil coating prevents or slows down rust.
Cathodic Protection :- It uses a sacrificial anode of more reactive metals like magnesium, zinc, aluminum with more negative electrode potential than that of iron. As a result, iron does not get oxidized at the cathode.
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Rusting is a chemical change. Rusting of Iron is the formation of a reddish-brown coating on the surface of the metal and its alloys due to the action of moisture and air over a long period. This phenomenon is a chemical change as Iron combines with Oxygen in presence of water to form a new compound, Iron oxide. This weakens the bonds between the atoms of Iron in the structure and as a result, rusted iron loses its desirable properties.
Prevention:
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Explanation:
Let the 2 numbers be x and y
y
x
=
3
7
x−y=48
3x=7y
x=
3
7y
=
3
7y
−y=48
=
3
4y
=48
y=
4
48×3
=36
x=y+48=36+48=84
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