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Chemistry

Chapter 1 - Transition Elements and Iron Metallurgy

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Lesson 2: Commercial Batteries, Fuel Cells and Metal Corrosion — Picture questions (exam style)

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1.
An iron sheet coated with Cu is scratched so the iron is exposed (see diagram) is left in moist air. What happens?
An iron sheet coated with Cu is scratched so the iron is exposed (see diagram) is left in moist air. What happens?
iron and Cu corrode at the same rate
iron does not rust; the coating keeps out water and oxygen
iron rusts faster because it becomes the anode relative to Cu
iron does not rust because Cu is oxidised instead (sacrificial protection)