Diffusion Abstract dialysis tubing is‚ made of cellulose because it’s a selectively permeable membrane. In this experiment‚ we are testing to see if the solution in the beaker moves into the dialysis bag. Which because of that‚ Introduction Diffusion and osmosis are two types of transport mechanisms. Diffusion is the movement of molecules from areas of higher concentrations to areas of lower concentration until the molecules are evenly distributed through the area. Osmosis is the dispersion of water
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Suggested answers to Practical Workbook for SBA Ch 1 Introducing biology Practical 1.1 Design an investigation of the effect of fresh pineapple on the setting of jelly Propose a hypothesis (p. 1-2) It is the fresh pineapple that causes the jelly to remain in liquid form. Design and perform an experiment (p. 1-2) 1 (Answer varies with Ss. The recommended quantity of jelly powder and water is stated on the packet of the jelly powder. Jelly will not set if it is too dilute.)
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control)‚ one with a fan pointing toward it creating a gentle breeze‚ on with a floodlight on it and a beaker felled with water as a heat sink‚ and one where the leaves are misted then covered with a transparent plastic bag. It is imperative that the tubing doesn ’t have any bubbles‚ otherwise the experiment will not work. After it equilibrates for ten minutes‚ readings are taken every three minutes for thirty minutes to determine how much water was lost. By dividing the amount of water lost by the
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temperature have on the rate of diffusion? How did molecule size affect the rate of diffusion? What happens to the rate 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
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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
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iodine and glucose in tied dialysis tubing to test for substance which diffuse through the membrane and which one could not due to its size. Materials and Methods Materials: * Distilled H2O * Starch solution * Iodine solution * Glucose solution * Test tube (3-4/group) * Test tube rack * Marking tape * Benedict’s test solution * Hot water bath * Dialysis tubing: 1 inch flat width‚ pre-soaked * Dialysis tubing: 3 inch flat width‚ pre-soaked *
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doable. The five methods are coagulation‚ carbon filtering‚ reverse osmosis‚ ground coffee filtering‚ and distillation. Coagulation was done by using a flocculant (aluminum sulfate) that clump small‚ destabilized particles together so that it could be easy separated from the water. Carbon filtering is a common way of removing impurities from water. At industrial strength‚ it is very effective at removing lead from water. Reverse osmosis is achieved by applying pressure to the lead nitrate
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observe the effects of osmosis as the Lugol’s regent (I2Kl) solution on the outside of the beaker permeates the intestine (Dialysis tubing) inducing a chemical reaction that will turn the liquid in the intestine (Dialysis tubing) blue-black. If the amylase successfully digests the starch‚ what results would you expect? If the amylase successfully digests the starch‚ I would expect a no color change occur as well as a presence of glucose in the intestine (Dialysis tubing). If the amylase only
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substitute for a formal laboratory report. The Lab Report Assistant is simply a su Premium 609 Words 3 Pages Diffusion and Osmosis of Solutes and Water Across a Membrane Diffusion and Osmosis of Solutes and Water Across a Membrane Brittany Bacallao Nova Southeastern University Abstract: This experiment gave a visual understanding of osmosis and diffusion. The first experiment proved that solutes would move down a concentration gradient if permeable to the sele Premium
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Briefly outline how water from the soil reaches the leaf. Marking scheme - concentration gradient/ root hair/ osmosis/ cell to cell/ root pressure/ xylem/ cohesion (or explained)/ adhesion (or capillarity or explained)/ Dixon and Joly/ transpiration or evaporation/ tension any six 6(3) Answer “ Water is drawn up the xylem by osmosis” Although the candidate has presented two key terms (xylem‚ osmosis)‚ the statement is incorrect and the candidate can only be awarded 3 marks for referring to the movement
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