Question detail
What is the reason small molecular substances usually have low boiling 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 ionic bonds.
- B. They have weak intermolecular forces.
- C. They are solid at room temperature.
- D. They contain large atoms.
Answer
The correct option is They have weak intermolecular forces.. This answer is correct because it matches the approved learning objective to explain why small molecular substances often have low melting points and low boiling points 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 explain why small molecular substances often have low melting points and low boiling points. 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
Properties of small molecules correction for Misunderstanding Melting
Students often think that small molecular substances have low melting and boiling points because the covalent bonds within the molecules are weak This error matters in Properties of small molecules because it drifts away from the objective: Explain why small molecular substances often have low melting points and low boiling points.
Correct it by naming the exact chemistry idea, using precise bonding or structure vocabulary, and linking the answer back to Properties of small molecules. For this objective, students should explain why small molecular substances often have low melting points and low boiling points.
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