of this lab was to depicked the many properties of diffusion such as isotonic‚ hypotnonic‚ and hypertonic‚ so that students could have a clear visual example to go by for future refrences. We also did this to learn about selective permeability and osmosis. Our original hypothesis stated that the vinegar would react with the calcium in the shell to create CO2 bubbles. Note I said the original hypothesis as this experiment took coarse over a four day period‚ in which a new variable was added each day
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molecular weight is‚ the faster the diffusion gets. The Starch did not pass through the membrane because it is composed of Polysaccharide made up of many Glucose molecules‚ which makes it heavier than one single Glucose molecule to pass through. Osmosis: We took three piece of potato and placed them in three beakers with the same quantity of water but with different concentrations‚ results are: Solution Result 0.9% NaClNothing happens H2O Hypotonic : Potato Swells 30% NaClHypertonic: Potato
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Initial mass (kg) Final mass (kg) Change in mass (%) 0.10 0.95 1.25 31.57 0.20 0.94 1.13 20.21 0.30 1.03 1.15 11.65 0.40 0.95 1.05 10.52 0.50 0.88 0.86 -2.27 0.60 0.93 0.84 -9.67 Control 0.99 1.40 42.41 Discussion. Osmosis is the passive diffusion of water molecules across a selectively permeable membrane from a down a concentration gradient. The water potential of a system is the tendency for water to exit the system. In this experiment the aim was to measure the
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POTENTIAL II OVERVIEW In this laboratory you will investigate the effect of solute concentration on water potential as it relates to living plant tissues. OBJECTIVES Before you begin this lab you should understand: - the mechanisms of diffusion and osmosis and their importance to cells - the concept of water potential - the relationship between solute concentration‚ pressure potential and the water potential of a solution - the concept of molarity and its relationship to osmotic concentration **also
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Activity 1: Stimulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. The two variables that affect the rate of diffusion are: • The composition of the lipid layer‚ this content varies from tissue to tissue. For example kidney tissues have a high cholesterol content which makes them impermeable to water. • The size of the molecule‚ the larger the molecule the slower the rate of diffusion. 2. Why do you think the urea was not able to diffuse
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a dynamic structure which gives them their remarkable activity and selectivity. (Hickman‚ 2008). Diffusion is the movement of particles from an area of higher concentration to a lower concentration until they reach Equilibrium. (Hickman‚ 2008).Osmosis happens when water diffuses across the membrane from the region of lower solute concentration (higher free water concentration) to that of higher solute concentration (lower free water concentration) until the solute concentrations on both sides of
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Activity 3 Simulating Osmotic Pressure 1. Explain the effect that increasing the Na+Cl− concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? ___ ___ 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. ___ ___ 3. Solutes are sometimes measured in milliosmoles. Explain the statement‚ “Water chases milliosmoles.” ___ ___ 4. The conditions were 9 mM albumin in the left beaker
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The Effect Salt Water Has On Radish Plant Growth By: Collins Azubuike
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1. Substances soluble in fat: fatty acid‚ glycerol‚ some vitamins (A‚D‚E‚K) 2. Neutral particles: water‚ oxygen‚ carbon dioxide‚ Example of Diffusion Between alveoli and blood capillaries in the lung during gases exchange. OSMOSIS What is Osmosis? Osmosis is the diffusion of a water through a semi-permeable membrane‚ from a solution of low solute concentration to a solution with high solute concentration. It is a physical process in which a solvent moves‚ without input of energy‚
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Week 2 Worksheet – Chapters 3‚ 4‚ and 5 ACROSS 1 The movement of a substance from one place to another due to the substance’s kinetic energy. Diffusion 3 The smallest living structural and functional unit that is enclosed by a membrane. Cell 6 The point at which a substance becomes evenly distributed throughout the solution and the concentration gradient disappears. equilibrium 7 One cell or a group of highly specialized epithelial cells that secrete substances into ducts‚ onto
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