Examining Diffusion and Osmosis Introduction: Purpose: 1. To simulate and observe the diffusion of solutes and the osmosis of water through a semipermeable membrane through color change and sugar tests. 2. To speculate osmosis occurring in dialysis bags and potato cores by comparing percentage change in masses. Background information: Molecules are always in random‚ constant movement due to their kinetic energy. This causes the molecules of a cell to move around and bump into each other
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The results that were collected in lab #1 shows the relationship of surface areand volume in the artificial cells to the diffusion rate using the phenolphthalein-NaOH agar and the HCl solution. Lab #2 was a model of diffusion and osmosis‚ in which we filled the model cells with different solutions and determined the rate of diffusion. In lab #3‚ the results demonstrated the interactions between selectively permeable membranes‚ water‚ and solutes and how they are important in cellular and organismal
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Osmosis is the movement of water from an area of high concentration to an area of low concentration across a semi permeable membrane. An osmotic system is established when a semi-permeable membrane is placed between two solutions. In this biological systems context‚ osmosis is the exchange of water between the potato cell and the surrounding medium of varying sucrose concentrated solutions‚ with the plasma membrane being the semi- permeable membrane. Because water molecules have kinetic energy‚ they
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Digital Balance used to measure the mass of the potato strip before and after osmosis. Time should be kept constant when the potato strip is put into the solution Hypothesis: The mass of the potato strip will increase in water and dilute concentrations of sucrose depending on the concentration within the cell. When the concentration of the sucrose solution outside the cells of the potato strip will be less‚ the mass of the solution will increase as water molecules from outside will diffuse into
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Fruit and Vegetable Supply Chain As the Indian population is increasing‚ the demand for fresh fruits and vegetables is also increasing. Owing to the perishable nature and very short shelf life‚ these items require storage and transportation facilities in order to reach to the customer in fresh state. This requires a considerable amount of effort from the involved parties. The entire chain is fraught with issues like lack of transparency in pricing (at the farmers’ end)‚ dominance of traders‚ weak
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Aim To observe and measure the effect of osmosis on the mass of potato using a starch solution. Introduction In order to measure the effect of osmosis‚ eighteen pieces of potato were cut and placed in six groups‚ each group of three pieces cut to weigh as close as possible to one another. For each potato group‚ a test tube was half filled with a starch solution varying in concentration from 0% (water) to 1%. Hypothesis Through osmosis‚ I hypothesise that as the solution of the starch in
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Fruit and vegetable consumption among young adults The World Health Organisation is predicting that chronic disease will account for over sixty per cent of deaths; with 41 million deaths by 2015.1 Up to 80% chronic disease could be prevented by eliminating tobacco use‚ unhealthy diet‚ physical inactivity and the harmful use of alcohol.2 Chronic disease and obesity in Australia are continuing to contribute to premature death and burden of disease.3 Cardiovascular disease and cancer remain the main
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The effect of osmosis on artificial cells with different concentrations of sucrose Alex McRae Biology 120-902 Grand Valley State University 1 Campus Drive Allendale‚ MI 49401 mcraeal@mail.gvsu.edu Abstract In this study‚ we tested the validity of osmosis in artificial animal cells. Osmosis is the diffusion of free water across a membrane. The purpose of the study was to calculate the rate of osmosis in artificial cells containing different
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ApUSH 6th period THE ROOTS OF SOCIETY Frederick Douglass Essay Maria Rodriguez 11/22/2013 In the narrative of the life of Frederick Douglass‚ the author refutes his argument of anti slavery in comparison to George Fitzhugh’s pro slavery argument by demonstrating the social hardship brought upon slaves. He attacks the argument of George Fitzhugh that states‚ the life of a slave is far more luxurious than that of a free laborer’s‚ and that a slave is happy and content to be serving such
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Introduction The reason of this experiment was to identify the properties and effects of osmosis. Osmosis can be defined as the diffusion of water through a selectively permeable membrane. (Miller/Levine) Osmosis occurs when there is an area of higher and lower concentration. Osmosis is a type of diffusion. Diffusion is when molecules move from an area of higher concentration to an area of higher concentration. The three types of concentrations are hypotonic‚ hypertonic‚ and isotonic. When in comparison
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