Exploration How do increasing sucrose concentrations of 0.0 mol dm3‚ 0.2 mol dm3‚ 0.4 mol dm3‚ 0.6 mol dm3 and 0.8 mol dm3 affect the osmolarity point of potato cells‚ where it is investigated how osmosis changes the weight of the potato cells‚ measured by the percentage change between the initial and final mass of the potato? Independent Variable: Increasing sucrose concentrations Dependant Variable: Mean percentage change in mass of potato cells All cells have a protective barrier‚ one which
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9 4 5 6 6.00 D 4 4 3 3 3.50 E 3 4 1 3 2.75 Table two: Calculation of cell count (ml-1) Tube Average Count for four (4x4 grids) Average Count ml-1 (no. X 104) Final Dilution factor Original cell concentration A 32.75 327500 × 4 131 × 104 B 10.25 102500 × 8 82 × 104 C 6.00 60000 × 16 96 × 104 D 3.50 35000 × 32 112 × 104 E 2.75 27500 × 68 187 × 104 Table Three: Percentage of cell viability (%) Tube Average viable cell count
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molecules possess kinetic energy (energy of motion)‚ they are constantly moving enabling the passive transfer of certain substances into and out of cells. Diffusion is the passive movement of molecules from an area of higher concentration to areas of lower concentration. In a closed environment‚ molecules will disperse until they reach a state a dynamic equilibrium. As the molecules approach equilibrium‚ the net or overall rate of diffusion begins to slow and occurs equally in all directions. In
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Article: Information technology: a growth navigator for small scale industries in India Small scale industries (SSI) have a significant role in the Indian economy in view of its contribution to production‚ employment‚ and export. However‚ since 1991 small scale industries in India find themselves in an intensely competitive environment due to globalization‚ domestic economic liberalization‚ and dilution of sector specific protective measures. The formation of World Trade Organization in 1995 also
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Aim: To investigate the rate of reaction between Calcium Carbonate (CaCo3) and hydrochloric acid (HCl) by changing the molarity of the acid and measuring how much Carbon Dioxide (Co2) is produced. Hypothesis: I predict that the higher the molar concentration of the acid the faster the reaction will take place therefor creating more gas in a shorter amount of time. I think this will happen because when the acidity is higher the solution is stronger which then speeds up the reaction process. Safety:
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Biomes Comparison Essay Ecologists group earth’s diverse environments into biomes. A biome is a complex of terrestrial communities that develops a large area and is characterized by certain soil climate conditions and particular assemblages of plants and animals. Not all species live in every biome they vary in their adaptations to different conditions. An adaptation is an inherited characteristic that increases an organism’s ability to survive and reproduce. These sorts of variations in plants
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equal or no solute forms an isotonic solution. Throughout this lab‚ data was collected and compiled to analyze these effects across selectively permeable membranes. The results indicated that the water molecules indeed move from high concentration to low concentration‚ while solutes do the same if the membrane is permeable to them. This was evident through our experiments in which membrane permeability was tested in living Elodea plant cell‚ which was placed in 3 different solutions‚ from distilled
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selectively permeable membrane from higher to lower concentrations. A selectively permeable membrane allows only some thing to go through. Water and oxygen are examples of molecules that are able to go through the membrane by diffusion. The net movement of these particles happens down the concentration membrane. Both diffusion and osmosis are passive
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You correctly answered: d. glucose and albumin are both too large to pass. The rate of diffusion for urea You correctly answered: b. is slower than that for sodium because urea is a larger molecule. Experiment Data: Solute MWCO Solute Concentration Average Diffusion Rate Na+ Cl- 20 9.00 0.0000 Urea 20 9.00 0.0000 Na+ Cl- 50 9.00 0.0150 Na+ Cl- 50 18.00
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prepared with 5% sucrose solution and were soaked in solutions of different concentrations. The diffusion of water across a semi-permeable membrane is called osmosis. When water diffuses‚ the water molecules move from a hypotonic environment to a hypertonic environment. Hypotonic means less concentrated than another solution. Hypertonic means more concentrated than another solution. If two solutions have equal concentration‚ they are said to be istonic Hypothesis: If three 8 in. sections of
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