what is the relationship between molecular weight and the rate of diffusion?
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Molecular weight will affect the rate of diffusion. All other things being constant, lighter weight molecules will move faster or diffuse faster that heavier molecules.
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Diffusion is the movement of particles from a high to lower concentration. Osmosis is the diffusion of water across a membrane.
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No matter what size sample of water you measure, the relationship between the mass and volume will always be the same. Because D=m/v, the density is the same for any amount of water.
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Since diffusion moves materials from an area of higher concentration to the lower, it is described as moving solutes "down the concentration gradient." The end result of diffusion is an equal concentration, or equilibrium, of molecules on both sides of the membrane. At equilibrium, movement of molecules does not stop.
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Molecular weight will affect the rate of diffusion. All other things being constant, lighter weight molecules will move faster or diffuse faster that heavier molecules. This property could be used to separate heavier molecules from lighter weight molecules.
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Weight, or W, is a product of mass or M and gravity or G, which leads to the following equation: W = M & G. In addition, mass and volume -- V -- are related by density or D, which measures the mass of a substance per unit volume via the following equation: D = M/V.
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Diffusion is the movement of one specific molecule from a high concentration area to a low concentration one. Filtration is the movement of a fluid (mixture of several molecules) from a region of high pressure to a region of a low pressure.
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The migration rate of DNA molecules of the same shape is inversely proportional to their size. This results in smaller DNA molecules to migrate faster through the gel. The charge to mass ratio is the same for different sized DNA molecules.
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The resistance to flow in turn is directly proportional to the viscosity η . Thus, the flow rate is inversely proportional to the viscosity.
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1 Answer. Diffusion is the movement of one specific molecule from a high concentration area to a low concentration one. Filtration is the movement of a fluid (mixture of several molecules) from a region of high pressure to a region of a low pressure.
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Diffusion is the movement of particles from a high to lower concentration. Osmosis is the diffusion of water across a membrane. Active transport moves particles from low to higher concentration.
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“The rate at which a substance reacts is directly proportional to its active mass and rate of a chemical reaction is directly proportional to product of active masses of reactants each raised to a power equal to corresponding stoichiometric coefficient appearing in the balanced chemical equation”.
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A. Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.
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Molecular weight is a measure of the sum of the atomic weight values of the atoms in a molecule. Molecular weight is used in chemistry to determine stoichiometry in chemical reactions and equations. Molecular weight is commonly abbreviated by M.W. or MW.
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Formula Mass Versus Molecular Mass D. ... The formula mass (formula weight) of a molecule is the sum of the atomic weights of the atoms in its empirical formula. The molecular mass (molecular weight) of a molecule is its average mass as calculated by adding together the atomic weights of the atoms in the molecular formula.
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The particle size affects the rate of diffusion by only allowing molecules that can fit through the barrier of the cell membrane. The molecular weight of the molecule can affect passage through the membrane because of the size they carry. Larger molecule are not able to pass through.
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Diffusion. Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across a space . You are familiar with diffusion of substances through the air.