According to Fick's laws, the diffusion
flux is proportional to the negative gradient of concentrations
. It goes from regions of higher concentration to regions of lower concentration.
What is the rule of diffusion?
Diffusion rule 1.
there must be openings in the membrane and the membrane must be semipermeable
. Diffusion rule 2. the substance must fit through the openings.
What is the rule that governs the direction of the diffusion of particles *?
What is the rule that governs the direction of the diffusion of particles?
Particles diffuse from an area where they are more concentrated to an area where they are less concentrated
. 3. How is the concentration gradient of a substance important to diffusion?
What determines the direction in which a substance diffuses across a membrane?
Concentration gradient, size of the particles that are diffusing, and temperature of the system
affect the rate of diffusion. Some materials diffuse readily through the membrane, but others require specialized proteins, such as channels and transporters, to carry them into or out of the cell.
What does diffusion depend on?
The diffusion rate depends on several factors:
the concentration gradient
(the increase or decrease in concentration from one point to another); the amount of surface area available for diffusion; and the distance the gas particles must travel.
How is the movement of particles in diffusion determined?
Diffusion is the movement of particles move from an area of high concentration to an area of low concentration until equilibrium is reached. … The rate of this movement is a function of
temperature, viscosity of the fluid and the size (mass) of the particles
.
How is air freshener an example of diffusion?
When perfume (or air freshener, cigarette smoke, or just about any other strongly scented substance) is produced in one part of a room,
it spreads to the rest through diffusion
. There are fewer of the scent-producing chemicals in the further parts of the room, so the molecules naturally spread out.
What are the 3 types of diffusion?
- (i) Simple diffusion is when ions or molecules diffuse from an area of high concentration to an area of low concentration.
- (ii) In osmosis, the particles moving are water molecules.
Which is an example of diffusion?
Diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is
the perfume of a flower that quickly permeates the still air of a room
.
What is diffusion give two examples?
You can smell perfume because it diffuses into the air
and makes its way into your nose. 2. Cigarette smoke diffuses into the air. 3. A few crystals of potassium permanganate in water will diffuse and turn the water purple.
How does the structure of the plasma membrane allow materials to move across it in both directions?
Unlike simple diffusion where materials pass through a membrane without the help of proteins, in
facilitated transport
, also called facilitated diffusion, materials diffuse across the plasma membrane with the help of membrane proteins.
What is the major difference between facilitated diffusion and passive diffusion?
| Simple Diffusion Facilitated Diffusion | Example of simple diffusion: passive transport of small nonpolar molecules across the plasma membrane Example of facilitated diffusion: passive transport of glucose and ions into and out of the cell |
|---|
Which of the following is common for both simple diffusion and facilitated diffusion?
They share some common characteristics which include the fact that both simple and facilitated diffusion are
passive processes
and therefore require no energy to take place as movement takes place down the concentration gradient of the molecules – this means that some molecules will be able to diffuse into the cell, …
What are the 5 factors that affect diffusion?
Several factors affect the rate of diffusion of a solute including
the mass of the solute, the temperature of the environment, the solvent density, and the distance traveled
.
Why does diffusion occur?
Diffusion occurs
when particles spread
. They move from a region where they are in high concentration to a region where they are in low concentration. Diffusion happens when the particles are free to move.
What are the three factors that affect diffusion?
- Membrane thickness – the thinner the membrane, the faster the rate of
diffusion
. … - Membrane surface area – the larger the surface area, the faster the rate of
diffusion
. … - Pressure difference across the membrane.
-
Diffusion
coefficient of the gas.
