Question detail
What is the main reason pure metals can be bent and shaped?
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 have strong covalent bonds
- B. They have regular layers of atoms that can slide
- C. They are made of small molecules
- D. They have high melting points
Answer
The correct option is They have regular layers of atoms that can slide. 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 have regular layers of atoms that can slide. They have regular layers of atoms that can slide 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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