water molecules through a selectively permeable membrane from an area of high concentration of water molecules (high water potential) to an area of a low concentration of water molecules (low water potential). From previous knowledge I know when a plant cell is put into a solution with the same concentration as the cell contents‚ this is referred to as isotonic‚ some water molecules move in and out. Due to no concentration gradient‚ no net flow. When a plant cell is placed in less concentrated solution
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Also‚ it will cause the blood vessels to constrict. (LaFave‚ 2003) These effects will work together to increase an animals heart rate. Under normal circumstances‚ the heart rate will increase as more caffeine is added. At some point the high concentration of caffeine will cause the heart to stop functioning. The effect of one outside substance can impair the effects of other substances. In this experiment we will intoxicate an organism. As a result‚ the nervous system will have difficulty responding
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twice 2. Read each set of directions 3. Complete each activity Data/Analysis: Activity 1: Review Sheet Results 1. Describe two variables that affect the rate of diffusion. Your answer: Increasing the number of membrane carriers and the concentration. 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? Your answer: Because Urea was too big to pass through the 20 MWCO membrane 3. Describe the results of the
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results more accurate. Hypothesis- Their will be a positive correlation between the concentration of caffeine given to the Daphnia and its heart rate. My reason behind this hypothesis is based on the fact that caffeine affects the heart rate of humans‚ as it is a stimulant. From this‚ I can assume that it also affects the heart rate of Daphnia and that the rise in heart rate should reflect the concentration of caffeine. Many scientific studies within the last few years have proven this‚ for
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Solvent through Osmosis or Diffusion Due to Different Concentration Gradients Passing Through a Semi-permeable Membrane between Cell and Cells Environment Bio 101 Objective: The objective is to simulate passive transport: diffusion of solutes and osmosis of water through a semipermeable membrane (dialysis tubing). The experiment will show how molecules in solution move from areas of higher concentration to areas of lower concentration in the attempt to reach homeostasis in different circumstances
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curve‚ concentration‚ and electronic transitions. The main objective of this experiment is to see how the percent composition of brass can be determined to verify the properties influenced by copper and zinc. Brass is a generic term for alloys of copper and zinc. The main technique used in this experiment is Spectroscopy. The three equations used in this lab are: Y = mx + b‚ where y = absorbance‚ x = concentration‚ and b = 0 using a calibration curve to establish the range of concentration values
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strongly. The intensity of the color is independent of pH in the range 2 to 9. The complex is very stable and the color intensity does not change appreciably long periods of time. Beer’s law is obeyed‚ over about 1.5-2 orders of magnitude of iron concentration. Beer’s Law is a very simple relationship: A = εbc where A is the absorbance of a substance at a specified wavelength λ‚ in units of nm for light in the
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alcohol concentration. Calculations made in lab: Concentration of ethanol solution: 96% Density: 0.78g/ml m/m% = mass of solute * 100/ mass of solution C1*V1 = C2V2 Convert from percentage to molarity Find equation Calibration curve find unkown values Example of doing this: Density of solution: mass of solution/volume of solution Concentration of ethanol: mass of solute/mass of solution *100 Table two: concentrations; the molarities substance Concentration of try one Concentration of try
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presented above‚ there are not clear conclusions that can be drawn. In Table 4‚ there is information regarding the effects of varying the concentration of a substrate‚ in this case the pea extract. To view the graphical representation‚ which more clearly displays the relationship‚ view Figure 2. The rate at which the reaction occurred for the 100% concentration is 1.45 mg/dL per minute. For the 50%‚ the rate was 3.05 mg/dL per minute‚ and for the 25%‚ the rate was 2.76 mg/dL per minute. As seen‚ the
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Liquids After studying the present lecture‚ you will be able to Define viscosity and viscosity coefficient Outline the method to measure viscosity using Ostwald viscometer Determine the average molecular weight of a polymer Determine the surface concentration of 1-butanol in aqueous solution Measure the distribution coefficient of a solute betweenn two solvents 39.1 Introduction Viscosity‚ one of the transport properties‚ arises because of intermolecular attractive and relatively long-range forces
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