Kinetic Theory and Diffusion

Just some quick cards to test yourself about Kinetic Thoery and Diffusion

Suggested for GCSE and IGCSE Chemistry

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Kinetic Theory and Diffusion

(http://www.docbrown.info/page12/gifs/Image72.gif)Arrangement of particles in solids liquids gases

Heating substances makes the particles vibrate (solid) or move (liquid and gas) faster

When a soolid is heated, the thermal energy is transferred to the particles as kinetic energy. The particles move faster until the forces of attraction are no longer strong enough to hold them together as a solid. If the liquid which is now formed is heated further, the particles will continue to move even faster until the forces of attraction are no longer strong enough to hold them together as a liquid.

Changes of state: melting, freezing, boiling, condensing and subliming

EVAPORATION AND BOILING ARE DIFFERENT

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Diffusion is the spreading out of particles

Particles like ammonia travel faster than particles like hydrochloric acid because they are lighter

Diffusion in liquids is slower than diffusion in gases because there are fewer and smaller gaps between the particles for other particles to diffuse into

Diffusion in liquids can be demonstrated by placing a small jar of strongly coloured solution such as potassium manganate into a gas jar of water

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