mol/L | 2.63g | 2.70g | 2.70% | 9 | 0.2 mol/L | 2.77g | 3.17g | 14.4% | 10 | 0.1 mol/L | 3.10g | 3.55g | 14.5% | 11 | 0.0 mol/L | 2.91g | 3.61g | 24.0% | Discussion: 1. Some potatoes increased in mass while others decreased due to osmosis. Potatoes that had a higher concentration increased in mass because water passed through the membrane into the potato in an effort to dilute it. Potatoes that had a lower concentration than the solution decreased in mass because water flowed through
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minutes and record your observations in the data table 5. While you are waiting‚ answer the questions. Questions: 1. Define diffusion – the movement of particles from an area of low concentration to an area of high concentration 2. Define osmosis - the movement of particles from low solute concentration to and area of high solute concentration across a semi-permeable membrane. 3. Why is iodine called an “indicator”? Iodine is called an indicator because it can detect the presence of
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The results provide evidence that when there was an increase in the sodium chloride concentration the mass of the potato prisms declined. At the zero percent concentration there was an increase of mass by 1.75%‚ from there the 1%‚ 3%‚ 5% and 10% begun on a downward trend with the percentage change in mass declining. The graph was on a steady decline from 0% being the highest point with a change of mass of 1.75% finishing with the 10% solution on a decline of -12.28%. From observing the scatter plot
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the process by which organisms balance water‚ or solvent‚ concentrations with salt‚ or solute‚ concentrations in tissues and cells (Campbell). Organisms must perform this process of regulation because of the “Fick’s Law of Diffusion”‚ also called osmosis‚ which states that‚ “The flow of solvent from a solution of lower solute concentration to one of higher solute concentration” will occur. This means that in an organism water will cross a semi-permeable layer‚ tissues in cell walls in this case‚ from
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one result of this molecular movement. Diffusion is the random movement of molecules from an area of higher concentration to areas of lower concentration. Osmosis is a special kind of diffusion where water moves through a selectively permeable membrane (a membrane that only allows certain molecules to diffuse though). Diffusion or osmosis occurs until dynamic equilibrium has been reached. This is the point where the concentrations in both areas are equal and no net movement will occur from one
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you be able to observe any diffusion? NO there is no diffusion taking place 5. Does being unable to observe diffusion necessarily mean that diffusion is not taking place? yes you should be able to tell when equilibrium is reached Osmosis Activity 4: Osmosis 1. Did you observe any pressure changes during the experiment? If so‚ in which beaker(s)‚ and with which membranes? Yes in the left beaker at the membrane 20 2. Why? 3. Did the Na+/Cl- diffuse from the left beaker to the right
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Experiment 5 Title: Membrane Permeability Objectives: 1. Define solvent‚ solute‚ solution‚ selectively permeable‚ diffusion‚ osmosis‚ concentration gradient‚ equilibrium‚ turgid‚ plasmolyzed‚ plasmolysis‚ turgor pressure‚ tonicity‚ hypertonic‚ isotonic‚ hypotonic; 2. Describe the effects of hypertonic‚ isotonic‚ and hypotonic solutions on Elodea leaf cells and onion scale leafs. Introduction: Membrane permeability is a quality of a cell’s plasma membrane that allows substances to pass in
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ACTIVITY ONE- Cell Transport Mechanisms and Permeability: Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. Molecular weight affects the rate of diffusion because the bigger the size of the molecule the longer it will take to diffuse. Membrane size is another variable that affects the rate of diffusion because if the membrane’s pores are small it will take molecules longer to diffuse though it than if the pores were larger. Also‚ membrane thickness
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Investigating the water potential of a potato Aim Osmosis is the movement of water molecules from a region of high water concentration to a low water concentration through a semi-permeable membrane. Our aim is to investigate the water potential of a potato through osmosis‚ by finding the difference in weight before and after the potato has been set in a solution of water‚ sugar or salt. Trial Method Firstly we collected the equipment. This included a scalpel‚ potato cutter‚ and test tubes. Then
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molecules Polar molecules Ions Match each organism with the strategy it uses to maintain osmotic balance. Oak tree Surround the cells with a rigid wall that can withstand the pressure that builds up inside the cells dues to the inflow of water by osmosis. Paramecium Use contractile vacuoles to actively pump water out of the cells. Humans Surround the cells with an isotonic extracellular fluid. If 2 solutions have unequal concentrations of solutes‚ the solution with the higher solute concentration
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