Question detail
How does the size of a molecule affect its boiling point?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Bonding
Question
- A. Larger molecules generally have lower boiling points.
- B. Larger molecules have stronger London dispersion forces.
- C. Larger molecules are always polar.
- D. Molecular size does not affect boiling point.
Answer
Larger molecules have stronger London dispersion forces.
Explanation
As molecular size increases, the number of electrons also increases, leading to stronger London dispersion forces. This results in higher boiling points due to the increased energy required to overcome these forces.
Common mistake
Misunderstanding Intermolecular Forces
Students often confuse the strength of intermolecular forces with the boiling point of a substance, thinking that all substances with high boiling points have strong intermolecular forces without considering molecular size and shape.
To accurately explain boiling point trends, remember that stronger intermolecular forces lead to higher boiling points, but also consider how molecular size and surface area affect these forces. For example, larger molecules have more surface area for London dispersion forces, which can increase boiling points despite weaker individual interactions.
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