Bio Lab 3 Cell Membranes Lab Report

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1BioLab3Cell MembranesLab ReportI.DiffusionDefine the following terms.SolventAny substance capable of dissolving or dispersing another substance.SoluteAny substance dispersed by water.Solution.Taken together, the solvent and the dissolved solute.DiffusionThe movement of dissolved molecules from an area of higherconcentration to lower concentration.ConcentrationgradientIs present when there is a difference in the amount of like moleculesin two regions.DynamicequilibriumWhen the solvent and solute molecules become equally distributedand the gradient comes to exist.EXERCISE 1–Factors influencing rate of diffusion•Predicthow molecule size and temperature will affect the outcome of this experiment.Molecule size will either increase or decrease diffusion based on the temperature.Record the data from the information in the lab.Potassium Permanganate R.T.Methylene Blue R.T.Time(min)TotalDiameter(mm)Distance ofDiffusion *(mm)Rate (mm/min) *TotalDiameter(mm)Distance ofDiffusion *(mm)Rate (mm/min) *08mm0mm0 mm/min7mm0mm0 mm/min1514mm6mm.43mm/min9mm2mm.13 mm/min3018mm10mm.33 mm/min10mm3mm.1 mm/min4520mm12mm.27 mm/min10mm3mm.07 mm/minPotassium Permanganate 5 CelsiusMethylene Blue 5 CelsiusTime(min)TotalDiameterDistance ofDiffusion *Rate (mm/min) *TotalDiameterDistance ofDiffusion *Rate (mm/min) *

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2© Access Learning Systems(mm)(mm)(mm)(mm)011mm0mm0 mm/min6mm0mm0 mm/min1512mm1mm.07 mm/min8mm2mm.13 mm/min3013mm2mm.07 mm/min9mm3mm.1 mm/min4514mm3mm.07 mm/min9mm3mm.07 mm/min* Distance diffused = diameter of each reading minus initial diameterRate = distance in mm/elapsed time (min)Double click the chart below.A spreadsheet will open.Enter the data fromthe table aboveinto thespreadsheet in the areas provided.When you are finished, click into another area of the lab report.The spreadsheet will close automatically.Do not close the spreadsheet with the X in the upper rightcorner.Diffusion of Potassium Permanganate and Methylene Blue00.20.40.60.81Initial Read15 Minutes30 Minutes45 MinutesTime ElapsedMovement Rate(mm/min)Potassium Permanganate (Room Temp)Potassium Permanganate (5°C)Methylene Blue (Room Temp)Methylene Blue (5°C)•What effect did temperature have on the rate of diffusion?It either increased or decreased the rate.•How did molecule size affect the rate of diffusion?At first the molecule was large and then it decreased.•What happens to the rate of diffusion over time?Why?It slows down, due to the temperature.•What can you conclude from this experiment?Temperature has an effect on diffusion.II.Osmosis

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