Diffusion Flashcards
What is diffusion?
The movement of a substance from an area of high concentration to an area of low concentration.
What causes diffusion?
Random motion of molecules in gases and liquids which is called kinetic energy.
Diffusion only stops when?
There is no concentration gradient which is an equal concentration in both areas.
What effects the rate of diffusion?
Temperature, steepness of concentration gradient, size,surface area and distance.
Is diffusion active or passive?
Passive.
Are all particles constantly in motion and why?
Yes,because they all have kinetic energy.
What do protein channels allow?
Specific water-soluble ions that pass through the membrane.
When do protein channels open?
In the presence of specific ions.
Concentration gradient?
The difference in concentration of molecules of a substance from the highest to the lowest number of molecules
Temperature of the molecule?
Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion by the molecules having more collisions.Lower temperatures decrease the energy of the molecules, this decreases the rate of diffusion.
How does distance affect the rate of diffusion?
The distance through which the material is diffusing. That is, smaller distances result in faster diffusion rates and larger distances result in slower diffusion rates.
How is diffusion affected by surface area?
Anything
The bigger surface area volume ratio causes increases the diffusion rate. That’s why, it was concluded that increasing surface area and volume ratio, increases the rate of diffusion.This means the surface area and volume ratio is proportional to rate of diffusion.
What is brownian motion?
The erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium.
