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2017 O Level Chem P1 Q3 — Kinetic Particle Theory / Diffusion Solution

Kinetic Particle Theory / Diffusion 2017 O Level Pure Chemistry · Paper 1 · Q3

Question

The stopper was removed from a bottle containing perfume X and the time taken for the smell to reach the opposite side of the room was noted. The experiment was repeated using perfume Y. Perfume Y has a higher relative molecular mass than perfume X. Which row gives the name of the process by which the perfume spreads around the room, and the identity of the perfume that reaches the opposite side of the room in the shorter time? Question diagram

Question diagram

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Correct answer: A

Video Solution

Explanation

Answer: A. A perfume spreads through the air by diffusion. The rate of diffusion depends on relative molecular mass: lighter molecules diffuse faster.

Perfume X has the lower relative molecular mass, so it reaches the far side of the room in the shorter time. The process is diffusion and the faster perfume is X.

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