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    Membrane filters

    Could someone please help me.. im a bit confused.. Why is the water made to flow ACROSS the membrane and not THROUGH it? What is the difference?? thanks!
  2. A

    buffers

    Hey, could someone please help me with the specific example of a buffer in a natural system? I've got some info on blood as a buffer, but i'm finding it really hard to understand it. Does anyone hav an example of a different buffer in a natural system?? Or maybe someone could explain...
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    Dry Cell

    Does anyone know the equation of what happens at the cathode ?? Thanks :)
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    American Dreams

    Does anyone watch American Dreams??? ITS SO GOOD!! my fav show!! It's on 9:30am on channel 7 weekdays.
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