not taste any substance in this experiment * Iodine solution and some powders are hazardous. * Wash hands when you have finished. Materials * Eye protection * Well plate * 6 small toothpicks for stirring each powder * 6 white powders: icing sugar‚ cornstarch‚ Aspirin powder‚ baking soda‚ baking powder‚ and the mystery powder * Scoopula * Test solutions in dropper bottles: water‚ universal indicator‚ vinegar‚ and iodine solution
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Reham Al Sultan Prof. Hirul‚ Term Paper 4/25/2014 Thyroid Disease Thyroid is a small gland found at the base of your neck‚ just below your Adam ’s apple. The thyroid produces two main hormones called T3 and T4. These hormones travel in your blood to all parts of your body. The thyroid hormones control the rate of many activities in your body. These include how fast you burn calories and how fast your heart beats. All of these activities together are known as your body ’s metabolism. A thyroid
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Introduction: The purpose of this lab was to check the time needed for salivary amylase and phosphorylase to produce a negative result and how different concentrations affected those times. Enzymes are biological catalysts that can cause a specific chemical change in any part of the body (Walsh‚ 2002). Many of the reactions that take place within a cell would normally take place at temperatures substantially higher than those present inside a cell (Alberts et al.‚ 2010). Because of this‚ these chemical
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reaction occurs; - the iodate ions are reduced to form iodine Burette containing potassium iodate solution IO3− + 6 H+ + 5 e− → ½ I2 + 3 H2O - while the iodide ions are oxidised to form iodine. 2 I− → I2 + 2 e− Combining these half-equations demonstrates the reaction between iodate and iodide 2 IO3− + 10 I− + 12 H+ → 6 I2 + 6 H2O It is the iodine formed by this reaction that oxidises the ascorbic acid to dehydroascorbic acid as the iodine is reduced to iodide ions. ascorbic acid + I2 →
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reaction: The bromine or iodine used in the titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction: BrO3- + 5 Br- + 6 H+ 3 Br2 + 3 H2O IO3- + 5 I- + 6 H+ 3 I2 + 3 H2O Sodium thiosulfate solutions can be standardized by direct titration of the I2 generated in in the KIO3 reaction using the starch-iodine complex as the indicator (remember that the iodine is actually in the form of
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Hypothesis : The diffusion of molecules across a semi permeable membrane is based on the size of the molecule Variables: a) Manipulated : Size of solute molecules b) Responding : Colour of solution c) Fixed : Temperature and time Materials : Iodine solution‚ Benedict’s solution‚ 1% starch suspension‚ 30% glucose solution and 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
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energy storage‚ and it also plays an important role in structural of living organisms. There are various of test can be done to identified the present of carbohydrates in foods but the few most well-know are the Molisch test‚ Bennedict test and the iodine test. Proteins are made up of amino acids‚ which are the simplest unit of proteins. The few maintests to identify the present of the proteins are Xanthoprotic test‚ Biuret test and also Ninhydrin test.The test used to identify the present of fats
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) Ascorbic acid‚ C6H8O6‚ is a reducing agent that reacts rapidly with iodine (I2) in acidic medium to produce iodide ion (I-) and dehydroascorbic acid‚ as shown in the following equation: [IMAGE] + I2(aq) -----------> + 2H+(aq) + 2I-(aq) Ascorbic acid (Vit. C) Dehydroascorbic acid However‚ since iodine is only slightly soluble in water‚ ascorgic acid should not be titrated directly by a standard iodine solution‚ since the end point of titration is not o obvious. Instead‚
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of ascorbic acid by iodine. The solubility of iodine is increased by complexation with iodide to form triiodide I2 (aq) + I- ºI3- Triiodide then oxidizes vitamin C to dehydroascorbic acid C6H8O6+ I3-+ H2O → C6H6O6+ 3I-+ 2H+(2) Vitamin C dehydroascorbic acid The endpoint is indicated by the reaction of iodine with starch suspension‚ which produces a blue-black product. As long as vitamin C is present‚ the triiodide is quickly converted to iodide ion‚ and no blue-black iodine-starch product is observed
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BABS1201 Group Enzymes Project Group Protocol Including Equipment and Reagents List Lab Day: Wednesday Lab Time: 10am – 1pm Are you in Lab G20 (furthest from BSB Student Office) or Lab G21 (closest to BSB Student Office)?: Demonstrator Name: Daniel Winters Names of Group Members: Johnny Nguyen‚ Therese Pham‚ Linda Tang Name of Enzyme You are Investigating: Amylase Brief Background: Amylase is a digestive enzyme‚ produced mainly by the salivary glands and the pancreas‚ to break down
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