Chemistry - 0620 CIE

Diffusion

Gbogbo ọrọ náà

Open a bottle of perfume at one side of a room and, a little later, someone on the far side can smell it. No one carried it across; the scent spread by itself. This silent spreading is diffusion, and it is direct evidence that particles are always on the move.

In this lesson you will learn what diffusion is, why it happens, and how the kinetic particle theory explains it. You will also see why gases diffuse faster than liquids, and why lighter particles diffuse faster than heavier ones at the same temperature.

Ebumnobi

Describe and explain diffusion in terms of kinetic particle theory.
[Supplement] Describe and explain the effect of relative molecular mass on the rate of diffusion of gases.

Akọmọ Ojú-ẹkọ

Diffusion is one of the clearest pieces of evidence that matter is made of moving particles. It also lies behind everyday processes, from a smell filling a room to the way dissolved substances spread through a liquid, so understanding it deepens your grasp of how particles behave.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Diffusion. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Diffusion is the spreading of particles from a region of: A. Low to high concentration B. High to low concentration C. Solid to liquid D. Cold to hot Answer: B
Diffusion happens because particles are: A. Stationary B. In constant random motion C. Always charged D. Bonded tightly Answer: B
In which state does diffusion take place fastest? A. Solid B. Liquid C. Gas D. It is the same in all Answer: C
At the same temperature, which particles diffuse fastest? A. The heaviest B. The lightest C. The largest D. The most charged Answer: B
Why does a smell spread across a still room? A. The air is blown across B. The particles move randomly and spread out C. The smell dissolves D. The particles are stirred Answer: B