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14 cards from this deck
All matter is tiny particles in constant, random motion
Robert Brown, Scottish botanist (1827)
1827
Random zig-zag movement of particles in fluid
Invisible molecules colliding with larger particles
Shows invisible particles constantly moving and colliding randomly
Particles spread from high to low concentration
Ammonium chloride (NH4Cl\text{NH}_4\text{Cl}NH4Cl), white solid
NH3(g)+HCl(g)→NH4Cl(s)\text{NH}_3(g) + \text{HCl}(g) \rightarrow \text{NH}_4\text{Cl}(s)NH3(g)+HCl(g)→NH4Cl(s)
Closer to HCl end
Ammonia molecules are lighter
Particles move spontaneously without external force
Random, zig-zag
Continuous and never stops
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