Introduction The movement of molecules from an area of greater concentration to an area of less concentration is called Diffusion. Osmosis is the diffusion of water through a selectively permeable membrane from an area with greater concentration of water to an area with less concentration. A Hypertonic Solution is a solution of a higher concentration of solutes and a smaller concentration of water molecules than another solution. However‚ an Isotonic Solution is a solution that contains an equal
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increasing the speed of digestion of fats. Amylase digested the starch in the visking tubing to form maltose. Since maltose is a small molecule‚ it was able to diffuse out of the visking tubing‚ down a concentration gradient form the visking tubing to the water in the beaker. The water will remain yellowish brown when iodine is added‚ Since starch is a big molecule‚ it will not be able to diffuse out of the visking tubing. It has a partially permeable membrane. Alcohol is a harmful substance
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distilled water Apparatus : A Visking tube‚ cotton thread‚ test tubes‚ beaker and water bath Procedure - Soak the Visking tube in water for 5 minutes to soften it. Open the Visking tube and tie one end of the tube with cotton thread to prevent leakage. - Fill the Visking tube with 15ml of glucose solution and 15ml of starch suspension. Tie the other end of tube tightly with cotton thread. Record the colour of the solution - Rinse the outer surface of Visking tube with distilled water. - Mix
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AQA GCSE Revision Topics B1a Human Biology MULTIPLE CHOICE QUESTION PAPER B1a. 1. Co-ordination and control p24 Responding to change Nervous system - neurones Hormones – glands Notes understand p26 Reflex action Reflex arc pathway synapse p28 Menstrual cycle FSH‚ oestrogen‚ LH‚ ovulation p30 Artificial control of fertility Contraceptive pill IVF treatment p32 Controlling conditions Water & ions – kidneys Temperature Blood glucose – insulin
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Guidelines for writing laboratory reports Laboratory reports should be written according to the format below (failure to do so will result in marks being deducted): Formatting Font Type: Times Roman Font size: 12 Spacing: 1.5‚ justified Pages : 5 (minimum) - 10 (maximum) [pages must be numbered] Title page You are required to use the lab report submission page available on the LMS and are to include these details: lab no.‚ title of experiment‚ students’ names and ID‚ date of experiment as well
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over 2 1 A 15 cm length of Visking tubing was knotted at one end to make a small tube. A 10 cm3 sample of a mixture of active yeast in 2% sucrose solution was placed in the tube and the tube was knotted at the top. The tube was suspended in a small beaker containing limewater‚ as shown in Fig. 1.1. The apparatus was left for 30 minutes at room temperature (22 °C) and then observed. For Examiner’s Use limewater active yeast in 2% sucrose solution Visking tubing Fig. 1.1 (a) (i) Suggest what
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that allow only certain solutions to pass through them. Osmosis is a special kind of diffusion that allows water to go through semi-permeable membranes of high water potential to a region of lower water potential. Water potential measures the tendency of water to leave one place and into another. Diffusion and osmosis is responsible for the movement of molecules in and out of cells. Diffusion and osmosis can be shown using dialysis tubing which is a membrane that is made of regenerated cellulose
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Aim: To observe and describe an example of osmosis. Hypothesis: I predict that the water level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with
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Diffusion & Osmosis: Introduction: This experiment was performed to demonstrate the process of osmosis and to show visible as well as quantitative evidence proving that osmosis occurred. Through the tasks of determining the percent concentrations in two different solutions‚ we were studying the process of osmosis. Osmosis is the best way to perform this experiment because as we went through the experiment‚ the weight of the beaker/dialysis tubing changed and the only logical explanation was
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Nikhil Gopalam October Mailbox #55 Affects of Osmosis and Diffusion Introduction: Perfume spreads in a room‚ hands bloat when left in water for too long (shriveling is a common misconception)‚ a tea bag’s contents diffuse through the water. These are all examples of diffusion and osmosis. These phenomena happen everyday and people don’t realize what is actually happening. The purpose of the lab is to see the effects of diffusion and osmosis. In part B‚ the higher the concentration of solute
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