A strength is that the experiment was quick and easy. Ways to improve the experiment A in which the experiment could be improved is that the dialysis tubing could have came already cut into the 25cm. Conclusion In conclusion to this‚ the results support the hypothesis. Which means as the percentage of sucrose increase‚ the weight of the dialysis bag had also increased. REFERENCES Helmenstine‚ A M. (2014). Examples of diffusion. Available: chemistry.about.com/od/solutionsmixtures/fl/examples-of-diffusion
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concentrations of sucrose on the mass of a potato cell. Results for Part One suggested that the molecular weight of albumin and starch was too large to pass through the dialysis tube‚ but glucose and sodium sulfate molecules were small enough to pass through the dialysis tube. Also‚ a decrease in water weight occurred due the dialysis tube being placed in a hypertonic solution. Results for Par Two showed the potato cell having a molar concentration of 0.2734‚ which caused sucrose concentrations above
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place and into another. Diffusion and osmosis is responsible for the movement of molecules in and out of cells. Diffusion and osmosis can be shown using dialysis tubing which is a membrane that is made of regenerated cellulose fibers into a flat tube. When solutions that contain dissolved substances‚ are separated by a membrane like the dialysis tubing‚ some may readily pass through it and others may not due to the size of the molecules. Hypothesis: Diffusion and osmosis will occur once dynamic
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Excretion in Humans Excretion is the removal of toxic materials‚ the waste products of metabolism and substance in excess of requirements from organisms. Metabolism is chemical reactions taking place inside cells‚ including respiration. The body excretes three main waste materials. These are Carbon Dioxide‚ Urea and Water. Excretion is a very important feature to us because without it toxic substances will build up in our bodies and kill us. It also helps in maintaining the composition of body
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When a person’s kidney has failed‚ there are only two options to treat it: dialysis or kidney transplantation. Dialysis is temporary and acts as an artificial kidney. Dialysis is very expensive and harsh. Dialysis filters your blood the way a kidney would. It doesn’t work 100%‚ but it works. People who are being treated with dialysis will be hooked up to a machine for the rest of their lives. When patients undergo dialysis‚ they should not add any stress because it will make them feel very faint and
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0.4M since the weight of the potato did not change after it was incubated in the solution with 0.4M. We also found that the potato was hypertonic to sucrose solutions of 0.0-0.3M and hypotonic to 0.5-0.6M. C. Dialysis Tubing Experiment We tested the permeability of the dialysis tubing to glucose‚ starch‚ and iodine. Initially‚ glucose and starch were placed into the bag‚ and iodine outside of the bag in the beaker. We used the iodine test for the presence of starch which proved positive
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Diffusion Through Membranes IB Biology 11 Diffusion Through Membranes OBJECTIVES In this experiment‚ you will Use a Conductivity Probe to measure the ionic concentration of various solutions. Study the effect of concentration gradients on the rate of diffusion. Determine if the diffusion rate for a molecule is affected by the presence of a second molecule. BACKGROUND Diffusion is a process that allows ions or molecules
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free water across a membrane. The purpose of the study was to calculate the rate of osmosis in artificial cells containing different concentrations of sucrose and water. We studied the rate of osmosis in artificial cells by creating five different dialysis bags with different concentrations of both sucrose and water and calculating the cumulative change in weight ever 10 minutes for 90 minutes. Our results for the artificial cells showed different concentrations moved from high to low concentrations-
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soaked dialysis tubing * 2 dialysis tubing clamps or pieces of twine * 2 clean plastic pipettes * 1 bottle of Lugol’s solution * 2 glucose test strips Procedure: Begin the experiment by placing 4 full pipettes worth of cooked starch in a beaker. Then‚ use a second clean pipette to add 4 full pipettes worth of α-amylase to the beaker and stir to simulate food mixing with saliva in the mouth. Afterwards‚ leaving the mixture in the beaker‚ obtain a piece of soaked dialysis tubing and
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caused by variety of factors resulting in damage of the nephrons‚ which are the most important functioning unit of the kidneys. Kidney failure can be broken down into three groups: acute‚ chronic‚ end-stage. Once kidney failure is irreversible‚ dialysis or transplantation is the only method of survival. To avoid a kidney transplant‚ one needs to be aware of the pre-disposing factors‚ signs and symptoms‚ available treatments‚ and proper diet. The kidneys are twin organs about the size of a fist
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