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SingaporeChemistryQuick questions
The Particulate Nature of Matter
Quick questions on Diffusion and Brownian motion explained: O-Level Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the effect of particle mass?Show answer
At the same temperature, all gas particles have the same average kinetic energy. Lighter particles must therefore move faster than heavier ones to have that energy, so:
What is diffusion as evidence for the particle model?Show answer
Diffusion is strong evidence for the kinetic particle model. The fact that a substance spreads out on its own, and that it does so faster for lighter particles and faster in gases than in liquids, can only be explained if matter is made of separate particles that are constantly moving in random directions. If matter were continuous, it could not spread by itself.
What is q1?Show answer
Define diffusion. [2 marks]
What is q2?Show answer
Explain why a smell spreads faster than a dye in still water. [2 marks]
What is q3?Show answer
Bromine gas (heavy particles) and methane gas (light particles) are released together. State which diffuses faster and why. [2 marks]
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