Question detail
Why might pure metals be unsuitable for certain applications?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
How bonding and structure are related to the properties of substances
Question
- A. They are too hard to shape
- B. They are too soft for some uses
- C. They do not conduct electricity
- D. They have low melting points
Answer
The correct option is They are too soft for some uses. This answer is correct because it matches the approved learning objective to explain why alloys are harder than pure metals using distortion of atom layers in the subtopic Properties of metals and alloys.
Explanation
The correct option is They are too soft for some uses. They are too soft for some uses is correct because it directly supports the approved learning objective to explain why alloys are harder than pure metals using distortion of atom layers. This belongs to the subtopic Properties of metals and alloys within How bonding and structure are related to the properties of substances, 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 Properties of metals and alloys.
Common mistake
Misunderstanding Alloy Hardness
Students often think that alloys are harder than pure metals because they contain more metal atoms.
Explain that alloys are harder due to the distortion of atom layers caused by the presence of differently sized atoms, which prevents the layers from sliding easily.
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