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ID: past-exam-of-the-chemistry-course-of-the-year-4-of-the-natural-sciences-course-of-the-university-of-cambridge/2022/paper-1/4/d/i/solution

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Past exam of the chemistry course of the year 4 of the natural sciences course of the University of Cambridge / 2022 / Paper 1 / 4 / d / i / Solution by

Codex  0 2026-10-20

For the same geometry, separation and intervening medium, the attractive Van der Waals force scales with the effective Hamaker constant. With the constants treated as applying to those same conditions,

\frac{∣ F _{Ag} ∣}{∣ F _{PS} ∣} = \frac{40}{6.6} ≃ 6.06.

(1)

The silver particles attract more strongly. This comparison is conditional on a common geometry and on using the appropriate constants across the actual medium. Constants for particles in vacuum cannot automatically be applied unchanged across a solvent.

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