Arianna Montoya Osmosis and Diffusion Lab Report Background Information: Diffusion involves the movement of solute particles across a 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
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LAB EXERCISE: Diffusion and Osmosis Laboratory Objectives After completing this lab topic‚ you should be able to: 1. Describe the mechanism of diffusion at the molecular level. 2. List several factors that influence the rate of diffusion. 3. Explain why diffusion is important to cells. 4. Describe a selectively permeable membrane‚ and explain its role in osmosis. 5. Define hypotonic‚ hypertonic‚ and isotonic in terms of relative concentrations of osmotically active substances. 6. Discuss
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movement from higher to lower concentration or lower to higher concentration is called hypotonic solution and hypertonic solution. Hypothesis: My Hypothesis for diffusion that the starch solution will be hypotonic and diffuse into potassium iodide (IkI). Hypothesis for osmosis is that each of the individual dialysis bags will increase because of the different concentration of the solutions. Which makes this and hypotonic experiment. Hypothesis for this experiment is that each of the four cylinders
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the following items are needed: Dialysis tubing‚ IKI solution‚ 15% glucose/1% starch solution‚ distilled water‚ balance‚ sucrose solutions (0.2M‚ 0.4M‚ 0.6M‚ 0.8M‚ 1.0M)‚ glucose test tape‚ beakers (multiple)‚ petri dish. In the experiment‚ one will measure diffusion through a selectively permeable membrane (dialysis tubing). A 30 cm by 2.5 cm piece of dialysis tubing that has been soaked in water is acquired and made into a bag by tying one end of the dialysis tubing and opening the other end.
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of diffusion over time? Why? What can you conclude from this experiment? II. Osmosis Define the following terms. Osmosis EXERCISE 2 – Osmosis demonstration After 15 minutes‚ record the volume change in each tube. Osmometer Dialysis Tube Contents Beaker Contents Volume Fluid Moved Direction of Movement 1 2 Describe the net movement of water in osmometer 1. Describe the net
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ntroduction: Cells have kinetic energy. This causes the molecules of the cell to move around and bump into each other. Diffusion is 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
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The purpose of the experiment conducted was to observe if a higher concentration or lower concentration gradient would affect the diffusion rate of the iodine moving through the starch concentration. This was shown to be an accurate experiment as with a higher concentration gradient the diffusion that did occur happened a lot faster and diffused more efficiently compared to no iodine solution and just water. This is due to the molecular collisions speeding up the experiment in the time period given
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The purpose was to see how easily molecules of smaller diameter‚ which were starch molecules‚ would pass through an artificial membrane‚ as opposed to how difficult it would be to pass through in the case of larger molecules‚ which were IKI molecules. Results were that the smaller substance passed though the membrane easily and
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Colligative Properties & Osmotic Pressure Peter Jeschofnig‚ Ph.D. Version 42-0149-00-01 Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate student’s writing of lab reports by
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Procedure Diffusion Jaydon‚ Jacob and Tyler obtained a 30 cm piece of dialysis tubing and cut 2.5cm off of the 30cm piece and soaked it in water. Then they tied one side off to form a bag. They then rubbed the other end of the bag to open it up and then are able to fill the bag with solution. The next step of the lab was to test for the presence of glucose in a 15% glucose and 1% starch. Then they took the 15% glucose and 1% starch and took 15 mL and placed them in enclosed bags. Jaydon‚ Jacob and
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