Question detail
A piece of brass is an example of an alloy. What does this tell us about its composition?
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. It is made of pure copper with a small amount of zinc added.
- B. It is a mixture of copper and zinc atoms in a fixed ratio.
- C. It is a pure zinc metal that has been coated with copper.
- D. It is a composite material with copper fibres in a zinc matrix.
Answer
The correct option is It is a mixture of copper and zinc atoms in a fixed ratio.. This answer is correct because it matches the approved learning objective to distinguish a pure metal from an alloy in terms of composition in the subtopic Alloys as useful materials.
Explanation
The correct option is It is a mixture of copper and zinc atoms in a fixed ratio.. It is a mixture of copper and zinc atoms in a fixed ratio. is correct because it directly supports the approved learning objective to distinguish a pure metal from an alloy in terms of composition. This belongs to the subtopic Alloys as useful materials 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 Alloys as useful materials.
Common mistake
Confusing Pure Metals and Alloys
Students often think that a pure metal and an alloy have the same composition, not recognizing that alloys are mixtures of different elements.
To fix this, remember that a pure metal consists of only one type of atom, while an alloy contains two or more different elements combined together.
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