Question detail
What is the primary benefit of adding scrap steel to the iron extraction process?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Life cycle assessment and recycling
Question
- A. It increases energy consumption.
- B. It reduces the need for mining new iron ore.
- C. It decreases the quality of the iron produced.
- D. It increases the amount of waste generated.
Answer
The correct option is It reduces the need for mining new iron ore.. This answer is correct because it matches the approved learning objective to explain how adding scrap steel to iron from a blast furnace can reduce the amount of iron extracted from ore in the subtopic Ways of reducing the use of resources.
Explanation
The correct option is It reduces the need for mining new iron ore.. It reduces the need for mining new iron ore. is correct because it directly supports the approved learning objective to explain how adding scrap steel to iron from a blast furnace can reduce the amount of iron extracted from ore. This belongs to the subtopic Ways of reducing the use of resources within Life cycle assessment and recycling, 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 Ways of reducing the use of resources.
Common mistake
Misunderstanding scrap steel’s role in iron production
Students often think adding scrap steel to the blast furnace simply replaces the iron ore, so no iron is extracted at all
Explain that scrap steel is melted and mixed with molten iron in the blast furnace, reducing the amount of iron ore that must be extracted and processed, but iron is still produced from the ore to meet the required iron content
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