What is the difference between "diffusion" and "osmosis"?

  • 0 votes

help plz :)

Posted Sat 5th May, 2012 @ 16:59 by Luke

8 Answers

  • 4 votes

Diffusion is the movement of molecules of a fluid from an area of high concentration (where there are lots of them already ... to an area of low concentration)

Osmosis is the movement of water molecules form n are of negative water potential to an area of more megative water potential across a partially permable membrane (Eg a cell membrane) 

Answered Sat 5th May, 2012 @ 17:04 by Edward Pinches
  • 4 votes

Diffusion is the movement of molecules from a high concentration (where there's lots) to a low concentration (Where there's not so many)

Osmosis is the movement of WATER MOLECULES from a high concentration to a low concentration through a semi permable membrane.

make sure that you mention all the words in bold when answering a question in the exam on osmosis or diffusion. There usually worth around 4 marks.

Answered Sat 5th May, 2012 @ 17:09 by Thegirlwhoknewtoomuch - Team GR
  • 1 vote

Osmosis is the net movement of water, and water only.

Diffusion can happen in air/water etc :)

Answered Sat 5th May, 2012 @ 17:04 by Becky
  • 1 vote

Diffusion is movement of any molecules from high to low concentration. Where as Osmosis is the movement of water molecules from a region  of high water potential to a region of low water potential, through a partially permeable membrane.

Highest water potential you get is Zero, and when ever you had a solute, you have a negavtive water potential. e.g adding sugar to water.

Learn the proper definition for Osmosis and Diffusion, but first understand the concept.

Answered Sat 12th May, 2012 @ 22:19 by Moona
  • 0 votes

osmosis is the diffusion of water from a high concentration to a low concentration, yet it is best to use the terminology high water potential to a low water potential (otherwise can lose marks)

diffusion can be a whole range of things, and always use- high concentration to a low concentation

hope this helps

Answered Sun 6th May, 2012 @ 22:33 by Cally
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OSMOSIS IS WATER MOLECULES FROM A HIGH WATER POTENTIAL TO  LOW WATER POTENTIAL

DIFFUSION IS ANY MOLECULE FROM HIGH CONCENTRATION TO A LOW CONCENTRATION.

Answered Sun 13th May, 2012 @ 12:03 by Georgina
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Diffusion is the passive (random) movement of particles from an area of high concentration to an area of low concentration

Osmosis is the movement of water molecules through a partially permeable membrane from an area of high concentration to an area of low concentration

Answered Tue 15th May, 2012 @ 22:29 by lalala
  • 0 votes

Diffusion is the net movement of particles/molecules down a concentration gradient, i.e. from an area of high concentration to an area of low concentration, using their kinetic energy.

Osmosis is the net movement of water molecules down a concentration gradient, i.e. from an area of high water potential to an area of low water potential, across a partially permeable membrane.

Answered Wed 16th May, 2012 @ 18:54 by Taha