# How does molecular weight affect diffusion. The Effect of Varying Molecular Weights on the Rate of Diffusion 2019-02-09

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## The Effect of Molecular Weight on the Diffusion Rate of Substances

Afterwards, it was observed that a white smoke appeared in the glass tubing and the position was marked. Furthermore, a hypothesis was formulated that if the molecular weight affects the rate of diffusion of substances, then a higher molecular weight would slow down the rate of diffusion. The study was performed at one of the laboratories in the Institute of Biological Sciences Wing C Building, University of the Philippines Los Banos Campus on August 14,2012. The sum of the atomic weights of all atoms making up a molecule. The molecular weight of a substance is the total weight of all atoms present in the compound. The rate of diffusion will depend on the ability of the diffusing molecule to dissolve in the lipid bilayer of the membrane.

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## The Effect of Molecular Weight on the Diffusion Rate of Substances

Properties of diffusion is the speed of diffusion is influenced by the size of molecule and temperature. Cells in particular need this to maintain homeostasis, or an internal equilibrium stability. Thus, molecular weight affects the diffusion. In all actuality however, this iss far from the truth. This relationship is presented in Figure 4. The diameter of the wells at 0 minute to 30 minutes were then measured and recorded for every 30 minutes. This can make itharder to breathe and at the same time limits the volume of airthat enters.

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## What Could Affect the Rate of Diffusion of a Molecule Through a Membrane?

The atomic weight is the mass, in atomic mass units, of an atom. If the hole is very small, then a molecule experiences few collisions as it flows through. Describe the results of the attempts to diffuse glucose and. Diffusion of solvents, such as water, through a is classified as. If the partition is removed, some molecules of A move towards the region occupied by B, their number depends on the number of molecules at the point considered. Imagine a fat man trying to ru … n and a slimmer man, the fat man would require more energy. Think of a mouse squeezing under a door as compared to a rock, of the same size.

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## What is the relationship between molecular weight and diffusion?

The barrier is removed, and the solute diffuses to fill the whole container. Consider two systems; S 1 and S 2 at the same and capable of exchanging. In general, a higher molecular weight improves the mechanical properties, that is, break, yield, and impact strength increase. Larger molecules will also diffuse faster when the concentration gradient is steeper. The Effect of Varying Molecular Weights on the Rate of Diffusion Essay Sample The effect of molecular weight on the rate of diffusion was verified by the 2 tests: the glass tube setup and the water agar-gel setup. There are three main problems that Kelly may be sustained.

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## Four Things That Affect Rate of Diffusion

Since that time, Balter has been a professional scientist and teacher. Controlled Variables Time time was kept constant while testing the diffusion spread of mythelin blue with each concentration. If theconcentration of oxygen outside the cell increases then it willdiffuse more quickly into the cell. A drop of potassium permanganate, potassium dichromate, and methylene blue were introduced to the three wells simultaneously. Glucose is able to get into cells much faster than other sugars. The hypothesis derived from the glass tube set-up was then tested by the use of the agar water gel set-up. Increasing the surface area of the cell membrane and reducing the distance needed for diffusion to occur also helps increase the rate of diffusion.

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## What Is the Relationship Between the Size of the Molecules & Diffusion Through the Cell Membrane?

A white ring of smoke formed closer to the heavier substance. The self-diffusion coefficient of neat water is: 2. The carrier then returns toits original shape and is ready to transport another glucosemolecule. The mean free path is directly proportional to the temperature of the gas, and the average velocity is proportional to the square root of the temperature divided by the square root of the molecular weight. For example, in the of , due to differences in partial pressures across the alveolar-capillary membrane, diffuses into the blood and diffuses out. Cells Building Blocks of Life.

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## The Effect of Molecular Weight on the Rate of Diffusion of...

Imagine when molecules are with a high viscosty. There are some females who might not gain any weight during their… how efficiently they work. Osmosis is the movement of water from a higher concentration to a lower concentration, and its purpose is to maintain stability between a solvent water and a solute. The self-diffusion coefficient of water has been experimentally determined with high accuracy and thus serves often as a reference value for measurements on other liquids. The rate of diffusion has a direct relationship with the concentration gradient, pressure and temperature. The water agar-gel setup was made up of a petri dish containing the gel with three wells. Thus, the rate of diffusion of diffusion is inversely proportional with time and molecular weight.

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## How does molecular weight affect the rate of diffusion

Expert: Robin Higgins Filmmaker: bjorn wilde Series Description: Chemistry plays a very important role in all of our lives each and every day. Once soaked, the cotton balls were separately placed at both ends of the glass tubing. It is either 1 the hypothesis is wrong and thus rejected, or 2 parts of the experiment's conduct was incorrectly done, such as the amount of the substance droped into the agar-water gel. However, when the surfaces are less sticky, less foreign particles attracted on to its surfaces. The same is true for cells where the amount of things inside and outside will be eq … ual, like salt content, and the rate at which it occurs does not affect the amount. Diffusion is the movement of solutes down their concentration gradient, toward a lesser concentration of solutes, in order to pass a membrane, such as the lipid bilayer of… 1319 Words 6 Pages samples to examine the effects of molecular weight has on the permeability across the cell membrane.

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## How does molecular affect the rate of diffusion

Small molecules can slip by the polar heads of the phospholipidsand through the membrane to the other side. Effusion, a process similar to diffusion, occurs when gas molecules escape through a small hole. It can be shown that the weight average molecular weight is a good measure for the expected statistical size of the polymer, whereas the number average molecular weight is a measure for the chain length. As with the basic equation of heat transfer, this indicates that the rate of force is directly proportional to the driving force, which is the concentration gradient. Diffusion is a process where molecules move from an area of high concentration to an area of low concentration.

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## How does molecular affect the rate of diffusion

He completed his copy-editing certificate in 2009 and holds a Bachelor of Science degree from the University of California-San Diego. Her family is on low hierarchy in the society. According to Rowland 1992 , the greater the difference in concentration is then the faster the rate of diffusion of the substance. For a repulsive interaction between particles, the diffusion coefficient tends to increase as concentration increases. It discusses effusion, which is basically the diffusion of particles through a small opening in a container. The higher the difference between the two concentrations, the faster the rate of diffusion. Diffusing molecules flow from high concentration to low concentration, and the rate of diffusion increases when the difference in concentration is greater.

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