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Iron is a metal that rusts - OCR Gateway - GCSE Chemistry - Question 1 - 2020 - Paper 1
Question 1
Iron is a metal that rusts. What conditions are needed for the rusting of iron? A. Air and an acid B. Air and salt C. Air and water D. Water and salt Your answ... show full transcript
Worked Solution & Example Answer:Iron is a metal that rusts - OCR Gateway - GCSE Chemistry - Question 1 - 2020 - Paper 1
Step 1
Air and water
Answer
For iron to rust, two essential conditions are required: air (specifically oxygen) and water. The process of rusting is an electrochemical reaction where iron reacts with oxygen in the presence of moisture to form iron oxide, commonly known as rust. This reaction can be summarized by the following equation:
Over time, iron(III) hydroxide can dehydrate to form rust: