recorded them and used our observations to propose a hypothesis. The experiments included chemical and physical reactions dealing with torn news paper‚ appearance of rock salt crystals‚ the appearance of sand‚ oil and water on plastic‚ and making iodine in water and mineral oil. We found that all these included four physical changes and two chemical changes. This was important in determining the substance or mixture that dealt with physical and chemical properties as well as homogeneous and heterogeneous
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titration. One of the best methods is the iodine-thiosulfate titration procedure. The iodide ion‚ I-‚ is easily oxidized by almost any oxidizing agent. In acid solution‚ hypochlorite ions oxidize iodide ions to form iodine‚ I2. The iodine that forms is then titrated with a standard solution of sodium thiosulfate. The analysis takes place in a series of steps: 1. Acidified iodide ion is added to hypochlorite ion solution and the iodide is oxidized to iodine. 2 H+(aq) + ClO-(aq)
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The most common use for iodine-131 is for the killing of thyroid cancer cells. The way this works is Thyroid cancer cells take up the iodine just as they would normally take up normal iodine. The Thyroid gland containing the cancer then has an accumulation of radioactive iodine-131‚ it gives off short range damaging beta radiation. This particular treatment has the benefit of being fairly localised
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Chemical reaction: C6H8O6 + I2→ 2I + C6H6O6 Ascorbic Acid: C6H8O6 Relative formula mass of C6H8O6= (12.01076) + (1.007948) + (15.99946)= 176.12412 g/mol Convert Iodine lost from mL to dm-3 = Iodine lost in mL1000= Iodine lost in dm-3 Convert Iodine lost (dm-3) to moles (n) by multiplying it with the concentration of Iodine used: n=0.005 Iodine lost in dm-3= mol of C6H8O6 Find the mass (g) of C6H8O6 in 50 mL by using this equation: m (mass)=Mr (Relative formula mass)n (mol) Convert into percentage
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The intended purpose of radioactive iodine is to eliminate all of the tissue that is over producing the thyroid hormone. However‚ in recent years‚ it has been shown that 10% to 40% of patients who receive radioactive iodine have to receive additional treatment. The experiment used to determine the efficiency of radioactive iodine used adult patients who were not pregnant and did not have thyroid cancer. A total of 325 patients were
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* Tripod * Gauze mat * A large white evaporating dish * Scissors and forceps | * Glass stirring rod * Test tube rack * Test-tube (30mm x 180mm) * Methylated spirits * Iodine solution * 100mL beaker * Soft green leaves * Rubber gloves | Risk Assessment: Risk | Prevention | Iodine Solution stains skin and clothesIt’s harmful with contact with eye or consumed | Wear rubber gloves‚ be careful with solutionDon’t touch eyes‚ keep away from mouth | Methylated spirits
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using starch and iodine? Introduction Amylase is an enzyme found in human saliva and pancreas. It is the digestive enzyme that is needed to breakdown starch molecules. Amylase must be kept at certain conditions to function at its optimum level. This experiment will explore the effect of pH (1‚ 4‚ 7‚ 10‚ and 14) on the function of amylase by using starch and iodine. Usually iodine has a orange-yellow color‚ but iodine and starch react to produce a dark blueblack color‚ so iodine may be used as
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Benedict’s reagent and Iodine stain tests. Benedict’s reagent will react to reducing substances in the solution by oxidizing it and changing the structure of the reducing sugar to form a colored precipitate. The color of this precipitate can be used to determine the concentration of reducing sugars in the substance. If the precipitate is blue no reducing sugars are in the substance. If the precipitate is bluish green‚ green‚ yellow‚ or orange it does contain reducing sugars. Iodine stain will be used
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starch Materials: foods containing starch‚ iodine‚ potassium iodine‚ water‚ Benedict’s solution Equipment: test tubes‚ test tube racks‚ water baths (boiling)‚ eye protection Method: 1) Two to three drops of the iodine were dropped in the potassium iodine solution to 2cm cube of the starch suspension. 2) Then a suspension was made up of the foods by mixing it with water. 3) Then two to three drops of the iodine was then dropped in the potassium iodine solution to each suspension. Results:
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decrease (Fig. 2). After 30 minutes‚ the concentration of iodine that had diffused was 0.048mol/L which contrasts the 0.011 mol/L that diffused at room temperature Fig. 1: The concentration of iodine diffusing across the membrane (mol/L) vs rate of diffusion (molecules/cm2 *min). The concentration was measured at 3 minutes intervals for 30 minutes. The increased for 9 minutes and then began to decrease. Fig. 2: The concentration of iodine (mol/L) diffusing across the membrane at 35.5°C vs the
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