Which factor speeds up rusting?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which factor speeds up rusting?

Explanation:
Rusting is an electrochemical process that needs moisture to proceed. When water is present, it acts as an electrolyte that lets ions move on the iron surface, so the iron can be oxidized while oxygen is reduced. This ion flow speeds up the redox reactions that form iron oxide, AKA rust. Without water, these movements are limited, so the rate drops; dry storage slows rusting. Oxygen alone isn’t enough to drive it quickly, and an oil layer blocks water and oxygen, also slowing the process. So the factor that speeds up rusting is the presence of water.

Rusting is an electrochemical process that needs moisture to proceed. When water is present, it acts as an electrolyte that lets ions move on the iron surface, so the iron can be oxidized while oxygen is reduced. This ion flow speeds up the redox reactions that form iron oxide, AKA rust. Without water, these movements are limited, so the rate drops; dry storage slows rusting. Oxygen alone isn’t enough to drive it quickly, and an oil layer blocks water and oxygen, also slowing the process. So the factor that speeds up rusting is the presence of water.

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