Investigation: A factor that affects the movement of water in and out of cells. Osmosis: movement of water from a region of high water potential to a region of low water potential through a partially permeable membrane. High water potential = lots of free water molecules‚ low solute concentration Low water potential = very few free water molecules‚ high solute concentration Factors That Affect the Movement of Water in and out of Cells * Solute concentration * If one solution
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Storage: Principles & Practice of Diffusion & Osmosis Store entire experiment at room temperature. EXPERIMENT OBJECTIVE The objective of this experiment is to develop an understanding of the molecular basis of diffusion and osmosis and its physiological importance. Students will analyze how solute size and concentration affect diffusion across semi-permeable membranes and how these processes affect water potential. Students will also calculate water potential of plant cells. EDVOTEK‚ Inc. •
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1.44 -2.04 Analysis ======== [IMAGE] [IMAGE] In the 1st experiment‚ as the concentration got higher‚ generally‚ the mass of the potatoes got lower‚ but the graph did not end up as a sigmoid curve which it is supposed to look like. In the 2nd experiment‚ as the concentration go higher‚ the mass of the potatoes got lower. The graph looks more like a graph with a sigmoid curve in but still‚ it is not exactly right‚ even though I did everything to make it a fair
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Diffusion and Osmosis of Solutes and Water Across a Membrane Brittany Bacallao Nova Southeastern University Abstract: This experiment gave a visual understanding of osmosis and diffusion. The first experiment proved that solutes would move down a concentration gradient if permeable to the selective membrane. The second experiment proved different solute concentrations affect the movement of water‚ depending on the solute concentration inside the cell. The purpose of this lab was to look for
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hypothesis made prior to the experiment was not correct - the distilled water did result in the most weight gain (g); however‚ the 5% salt concentration did not result in the least weight gain (g). Table 1 clearly highlights that the 3% salt concentration resulted in the least weight gain (g). The distilled water resulted in the most weight gain (g) because the solution is hypotonic – a hypotonic solution results in the water diffusing into the cell because the molecules of the substance are moving
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the spread of something more widely. Substances diffuse in high concentrated area to a low concentrated area. Water is one molecule that can diffuse freely in a cell. Other molecules need assistance through the cell membrane through a process called facilitated diffusion. Osmosis moves from an area of low concentration to high concentration. In osmosis water moves in the opposite way. Water flow is determined by the concentration‚ not the nature of the solute. There are a couple of things to consider
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A STUDY OF OSMOSIS Han Cheng Water passes through aquaporins in cell membranes from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration). This process is called osmosis. It requires no cellular energy to be used‚ and occurs due to the random‚ continuous motion of all molecules. If a cell is placed in an environment in which the concentration of water is less than in the cell (hypertonic)‚ water will flow from the cytoplasm
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How can we increase the rate at which sugar cube be dissolve in water? Hypothesis: My hypothesis is that the hot water will dissolve the most sugar among most of our other methods. I picked the hot water because hot water molecules tend to move very fast. which increases the speed of how the molecules take away the sugar molecules which make sugar dissolve quicker inside of the hot water. Materials: 3 cups Water and hot water Spoon Sugar cubes Stop watch Mortar and pestle
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Popping Potatoes Is there such a thing as potatoes that pop? Popchips‚ a new generation of potato chips manufactured without frying or baking released an advertisement in 2012 featuring Katy Perry. The target audience of this ad is the younger generation of women‚ taking in consideration their mind-set and preys on their biggest obsession: to lose weight. This ad hinges on the premise that women prefer to eat the foods that they love while at the same time shedding the pounds. The primary purpose
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Potatoes The initial weights of the potato cubes ranged from 0.93-1.04 grams from the solutions containing AgNO3 (Table 1). Graph one depicts the correlation of percent change in weight for each sucrose concentration with AgNO3 added. The initial length of the potato cylinders were 2cm as depicted in table two. Graph two depicts the correlation of percent change in length in different sucrose concentrations. The initial weights for the solutions lacking AgNO3 ranged from 1.0-1.7grams (Table 3)
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