Question detail
How do larger molecules affect London dispersion forces?
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. They decrease the forces due to increased distance
- B. They increase the forces due to more electrons
- C. They have no effect on the forces
- D. They only affect polar molecules
Answer
They increase the forces due to more electrons
Explanation
Larger molecules have more electrons, which can lead to stronger temporary dipoles, thus increasing the London dispersion forces between them.
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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