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SingaporeChemistryQuick questions
The Particulate Nature of Matter
Quick questions on Changes of state and diffusion: N(A)-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 changes of state?Show answer
Each change has a name and a direction:
What is diffusion?Show answer
Diffusion is the spreading out of particles from where they are crowded together (high concentration) to where there are fewer of them (low concentration), because the particles are always moving randomly. It explains why a smell spreads across a room and why a coloured dye spreads through still water.
What is q1?Show answer
Name the change of state when a gas turns directly into a solid, and the reverse change when a solid turns directly into a gas. [2 marks]
What is q2?Show answer
Explain why a puddle of water dries up faster on a warm day than a cold day. [2 marks]
What is q3?Show answer
Two gases are released at opposite ends of a tube. Explain why they eventually mix in the middle. [2 marks]
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