physical and atomistic one‚ by considering the random walk of the diffusing particles. In the phenomenological approach‚ according to Fick’s laws‚ the diffusion flux is proportional to the minus gradient of concentrations. It goes from regions of higher concentration to regions of lower concentration. Later on‚ various generalizations of the Fick’s laws were developed in the frame of thermodynamics and non-equilibrium thermodynamics. From the atomistic point of view‚ diffusion is considered as a result
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demonstrate the process of osmosis using potatoes‚ and to determine the concentration of the cytoplasm of the potato. To demonstrate this‚ we had 6 test tubes and poured in different sucrose solutions of the following concentrations: 0.0M‚ 0.1M‚ 0.2M‚ 0.5M‚ and 1.0M. Once added in with all the sucrose solutions‚ we added in the 6 cylindrical potatoes of equal diameter and length. Before and after putting it in the potatoes‚ we had to weigh the initial and the final mass of each potato. After you have left
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Curing Salt / Prague Powder‚ Composition and Safety Issues Posted on August 24‚ 2010 by marvin A sausage is not a sausage without the curing salt. The same is true with tocino‚ it may look like it but taste will be different. Prague powder or curing salt is responsible for giving the processed meat product it characteristic flavor and color. Try to make tocino without prague powder. Drop me a comment‚ if you prove me wrong. It also function as preservative. A substance that kills spoilage bacteria
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The Effect Of Enzyme Concentration On Enzyme Activity The pancreatic duct in individuals who have cystic fibrosis frequently becomes blocked‚ reducing or preventing the release of pancreatic enzymes into the small intestine. The aim of this activity is to investigate the effect of a reduction in enzyme concentration on the rate of reaction‚ in this case the breakdown of protein by protease enzymes. Aim – Milk powder contains a white protein called casein. A white suspension of
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Michelle Kim 2012.1.20 Biology Iso-osmolar Concentration of Carrot Cells Lab INTRODUCTION For a more thorough understanding of this lab introduction‚ the concepts of‚ iso osmolar‚ membrane‚ equilibrium‚ and concentration gradient evaluated. Iso osmolar can be known as the point in which the substance of experimentation faces no change despite the amount of solute inside the solvent( because the solvent and solute concentration is equal. This is where the line on a graph would cross on the
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Diffusion and Osmosis Diffusion -the process by which molecules spread from areas of high concentratiion‚ to areas of low concentration. When the molecules are even throughout a space - it is called EQUILIBRIUM DIFFUSION Concentration gradient - a difference between concentrations in a space. Molecules will always move down the concentration gradient‚ toward areas of lesser concentration. Think of food coloring that spreads out in a glass of water‚ or air freshener sprayed in a room
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Effect of Substrate Concentration on Catalase Aim: An experiment to find out how the concentration of hydrogen peroxide affects the rate of reaction of the enzyme catalase. Background Information: Enzymes such as catalase are globular protein molecules with catalytic properties. A catalyst is a substrate which can alter the rate of reaction without itself undergoing any permanent change. As they are not changed
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make a task easier. A cell phone is a type of technology that is a common thing to see in everyday life. The world and the people in it have gotten used to this technology. Cell phones are making the lives of an estimated two hundred sixty five million Americans (Natterson 103) and three billion worldwide (Natterson 103)‚ easier. As useful as cell phones may be‚ there are negative effects in over using cell phones. Cell phone technology was first developed in the 1980’s‚ but cell phones became common
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The process of Natural Importance Introduction Osmosis is when a fluid passes threw a semi permeable membrane. Moving from an area in which a solute such as salt is present in low concentrations to an area in which the solute is present in high concentrations. There are three types of osmosis: hypertonic is when there is high concentration and the cell has no water inside it (shrunk)‚ hypotonic is when there is low concentration and the cell has swelled up or in other words has a lot of water
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EFFECT OF CONCENTRATION ON REACTION RATE The aim of this experiment is to find the effect of varying the concentration of iodide ions on the rate of reaction between hydrogen peroxide and an acidified solution of potassium iodide: H2O2(aq) + 2H+(aq) + 2I⁻ → 2H2O(l) + I2(aq) The course of this reaction can be followed by carrying it out in the presence of small quantities of starch and sodium thiosulfate solutions. As the iodine molecules are produced they immediately react with the thiosulfate
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