Question detail
In an experiment to demonstrate rusting, which setup would best show that both air and water are needed?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using materials
Question
- A. Iron nail in oil
- B. Iron nail in a sealed jar with water
- C. Iron nail in a jar with water and air exposure
- D. Iron nail in dry sand
Answer
The correct option is Iron nail in a jar with water and air exposure. This answer is correct because it matches the approved learning objective to explain that both air and water are needed for iron to rust. (Chemistry only) in the subtopic Corrosion and its prevention.
Explanation
The correct option is Iron nail in a jar with water and air exposure. Iron nail in a jar with water and air exposure is correct because it directly supports the approved learning objective to explain that both air and water are needed for iron to rust. (Chemistry only). This belongs to the subtopic Corrosion and its prevention within Using materials, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Corrosion and its prevention.
Common mistake
Common Misunderstanding of Rusting
Students often think that only one of air or water is needed for iron to rust, believing that either can be sufficient on its own.
Emphasize that both air and water are essential for the rusting process to occur, as they work together to facilitate the chemical reactions that lead to corrosion.
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