SC-425
Diffusion
Lower Sec Science · Secondary 1 · Hard · Diffusion
A student explains diffusion using the particle model. She says: "Perfume spreads across a room because the particles move randomly and fill up the empty spaces between air particles."
Based on the particle model, which statement best describes why diffusion happens faster in a gas than in a liquid?
Based on the particle model, which statement best describes why diffusion happens faster in a gas than in a liquid?
- Gas particles are further apart and move faster, so they spread and mix more quickly.
- Gas particles are heavier than liquid particles, so they sink and spread faster.
- Gas particles are fixed in position, so they can pass messages along quickly.
- Gas particles do not move at all, so other particles move around them faster.
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