Question detail
Explain how molecular size affects London dispersion forces between molecules.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Bonding
Question
Explain how molecular size affects London dispersion forces between molecules.
Answer
As molecular size increases, the number of electrons also increases, leading to stronger London dispersion forces. Larger molecules have a greater surface area, which allows for more significant temporary dipoles to form, enhancing the intermolecular attractions.
Explanation
This answer is strong because it directly addresses the relationship between molecular size and London dispersion forces, demonstrating an understanding of how electron distribution affects intermolecular interactions. It tests the student's ability to apply knowledge of intermolecular forces to molecular characteristics.
Common mistake
Misunderstanding London Forces
Students often confuse the effect of molecular size and surface contact on London dispersion forces, thinking that larger molecules always have stronger forces without considering surface area.
To explain how molecular size and surface contact affect London forces, use the formula that larger surface areas lead to increased contact points, enhancing the strength of London forces. For example, when comparing two molecules, if molecule A has a larger surface area than molecule B, then the London forces in molecule A will be stronger due to more significant surface contact. Therefore, larger and more branched molecules typically exhibit stronger London forces.
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