Question detail
Explain how galvanising protects iron from rusting.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Using materials
Question
Explain how galvanising protects iron from rusting.
Answer
Galvanising protects iron by coating it with a layer of zinc. The zinc acts as a sacrificial anode, corroding in place of the iron, thus preventing rusting.
Explanation
This question assesses the student's ability to explain a specific corrosion prevention method. The answer highlights the protective role of zinc and the concept of sacrificial protection.
Common mistake
Confusing Protection Methods
Students often confuse barrier protection with sacrificial protection, thinking they are the same.
Remember that barrier protection involves covering the metal with a protective layer (like paint or grease), while sacrificial protection involves using a more reactive metal that corrodes instead of the iron.
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