Question detail
Why do small molecular substances usually have low melting points?
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 weak intermolecular forces
- C. They have high molecular weights
- D. They are ionic compounds
Answer
The correct option is They have weak intermolecular forces. This answer is correct because it matches the approved learning objective to identify intermolecular forces as the forces overcome when small molecular substances melt or boil in the subtopic Properties of small molecules.
Explanation
The correct option is They have weak intermolecular forces. They have weak intermolecular forces is correct because it directly supports the approved learning objective to identify intermolecular forces as the forces overcome when small molecular substances melt or boil. This belongs to the subtopic Properties of small molecules 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 small molecules.
Common mistake
Confusing Intermolecular Forces with Covalent Bonds
Students often state that covalent bonds are broken when small molecular substances melt or boil.
Students should clarify that it is the weak intermolecular forces that are overcome during melting or boiling, not the covalent bonds within the molecules.
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