Why Are Some Substances Able To Pass Through The Membrane? The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Transport proteins make passage possible for molecules and ions that would not be able to pass through a plain phospholipid bilayer. Why
Which Factors Does Molecular Speed Depend On? The speed of the molecules in a gas is proportional to the temperature and is inversely proportional to molar mass of the gas. In other words, as the temperature of a sample of gas is increased, the molecules speed up and the root mean square molecular speed increases
Why Diffusion Is Faster In Water? This is because in hot water, the water molecules have more energy and are moving faster than the molecules of cold water. … Because diffusion happens from high concentration to low concentration, the more molecules are moving, the more opportunities they have to mix together. Why is diffusion quicker
What Effect Does Temperature Have On Diffusion? The higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly. The greater the surface area, the faster the rate of diffusion. What role does temperature play in diffusion? Temperature: Higher temperatures increase the energy and therefore the movement
How Does The Cell Membrane Control Diffusion? The cell membrane controls what goes in and out by having protein channels that act like funnels in some cases and pumps in other cases. Passive transport does not require energy molecules and happens when a funnel opens in the membrane, letting molecules flow through. What determines the
Why Does Size Affect Diffusion? When the cell increases in size, the volume increases faster than the surface area, because volume is cubed where surface area is squared. When there is more volume and less surface area, diffusion takes longer and is less effective. … this is actually why cells divide. Why do larger molecules
How Does Shape Affect Diffusion? Size and shape also affect the ability of diffusion to supply the demands of the cell. Diffusion is a slow process, particularly within the cytosol. Thus, as cells get larger or more spherical, the average distance matter must travel within the cell increases. Why does shape affect diffusion? In theory,
How Does Self Diffusion Occur? Self-diffusion occurs by a vacancy mechanism, whereas carbon diffusion in iron is interstitial. Diffusion coefficient is the measure of mobility of diffusing species. or diffusion of substitutional atoms). ones (the atomic diameters decrease from C to N to H). What is meant by self-diffusion? [¦self di¦fyü·zhən] (solid-state physics) The spontaneous
How Does Diffusion Coefficient Change With Temperature? We note also that the diffusion coefficient increases strongly with the temperature of contact. … The coefficient of diffusion increases gradually as the temperature of the air increases. The activation energy was calculated by using the Arrhenius equation How does diffusion coefficient vary with temperature and pressure? In
What Are The Different Mechanisms For Diffusion? Diffusion can occur by two different mechanisms: interstitial diffusion and substitutional diffusion. Which diffusion mechanisms is the fastest? Interstitial diffusion is generally faster than vacancy diffusion because bonding of interstitials to the surrounding atoms is normally weaker and there are many more interstitial sites than vacancy sites to