Question

24 (i) What causes rusting of iron ? Design an activity to show the conditions needed for iron nailsto rust.(ii) Why do we paint iron articles ?

Answer 1

24(i).What Causes Rust?

Rust is the normal electrochemical process of metals returning to their natural unrefined state. It occurs when Iron, Oxygen and Water (air moisture) combine. The rusting process can be accelerated when Iron is subjected to nature's minerals, chemicals and temperature fluctuations.

Why Does Rust Happen?

Iron and oxygen have opposite charges so they seek out each other to combine. When they combine, the iron loses electrons to oxygen atoms. This is called oxidation and when it happens it produces a chemical reaction forming Fe203 Iron Oxide otherwise known as Ferric Oxide, or more commonly known as rust.

Answer 2

rusting is the phenomenon of degradation of metal surface
it is caused due to presence of moisture
air ,acid etc
put an iron in acid medium for batter result of rusting after few days the layer above iron become rusted and form thin layer
we should paint iron particle to prevent it from corrison
hope it helps you