boiling points of the elements down group VII from Fluorine to Iodine. All of the halogens exist as diatomic molecules (F2‚ Cl2 and I2) the intermolecular attractions between the molecules hold them together. The larger the molecule (as it moves down the halogen group) the bigger the intermolecular forces are between electrons because with more rings the distance between each electron is larger. The larger elements such as Bromine and Iodine are larger molecules with a larger amount of intermolecular
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C: freshly squeezed OJ‚ bottled OJ‚ frozen OJ‚ canned OJ * Optional: container for waste solutions and source of clean rinse water There are two different preparations (starch-iodine or indophenol) that may be used for the vitamin C indicator solution. Neither is more accurate than the other. The starch-iodine mixture is much cheaper. It can be made ahead and stored in a dark‚ cool place in two liter soda bottles and dispensed in liter containers at the lab stations. Both indicators vary from
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and accumulation of radioactive iodine in thyroid 2. Name the Independent Variable. thyroid activity 3. Name the Controlled Variables. gender‚ age 4. Why was RIA used to measure Thyroxine while IRMA was used to measure TSH? RIA is used to measures the thyroxine levels in the blood‚ while the IRMA measures high or low levels of TSH being released. 5. How was it used to observe relative amount of iodine accumulated by thyroid gland? RAI measures the amount of iodine that is absorbed by the thyroid
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Lab Report Title: * Color reaction of starch when mixed with Iodine solution Introduction: Statement: * How would the varying solutions react when introduced with the Iodine solution? Hypothesis: * If a solution is rich in starch then it will react with iodine solution and change to a bluish-black color (looks Brown) Materials: Items: * 8 test tubes‚ pipet‚ iodine‚ onion juice‚ potato juice‚ sucrose solution‚ glucose solution‚ distilled water‚ fructose solution‚ starch solution
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beaker Medium Ring for Ringstand Weight scale Matches Distilled water Wire gauze 50 ml cylinder Evaporating dish Funnel Filter Paper Ringstand Wash Bottle Glass stirring rod Tincture of Iodine Mineral Oil Silver Nitrate Iodine Crystals Small Test tubes The first thing we had to do was fill a 150 ml beaker with 6 grams of dried seaweed‚ which we had to approximate on a
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temperature for these enzymes. The amylase was mixed with starch at temperatures of 0℃‚ 37℃‚ 57℃‚ and 90℃. Iodine was added to each mixture and colour changes in each case. Bacteria amylase was found to be effective at 55 0C as the temperature dropped drastically from 4.58℃ to 2.33℃. This shows that the amylase catabolized a lot of starch hence little is left which cannot turn the iodine solution to blue-black which indicates the presence of starch. Fungal amylase is denatured at 90 ℃. This was
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that is sticky and consisting of thyroglobulin molecules and attached to this areiodine atoms. The thyroid hormone is resultant from this iodinated thyroglobulin. The thyroid hormone moreover named the metabolic hormone‚ which is actually two active iodine-containing hormones‚ thyroxin or T4‚ and triiodothyronine‚ or T3. The thyroid folliclessecrete the thyroxin. Every cell in the body is affected by the thyroid hormone. Not only does it increase the basal metabolic rate but it also stimulates enzymes
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performance liquid chromatography (HPLC). 2.2.3 Enzymatic method. 4 4 4 6 6 CHAPTER 3 METHODOLOGY. 3.1 Method using iodometric titration 3.2 Materials and reagents. 3.3 Preparation of iodine solution. 3.4 Preparation of vitamin C standard solution. 3.5 Standardisation of iodine solution with the vitamin C standard solution 3.6 Titration of
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Results Table 1: Experimental results for part A Trial 1(L) Trial 2(L) Trial 3(L) Trial 4(L) Trial 5(L) Initial Reading 0 0 0 0.4 0.9 Final Reading 19.7 19.1 18.9 19.7 19.9 Titre Value 19.7 19.1 18.9 19.3 19 Table 1 above displays the titres obtained during 5 trials in part A of this assay. The titre values procured in trial 2‚ trial 3 and trial 5 manifests an agreement within 0.1mL. However‚ the result achieved in trial 1 and 4 are outliers because of their distance from other observations
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microscopic examination‚ starch grains‚ onion cells and cheek cells are observed .Difference between starch grains‚ onion cells and cheek cells could be differentiate. Materials: * * Small piece of potato‚ * distilled water‚ * iodine solution * a petal of onion * methylene blue solution * cheek cells. Apparatus: * * Cork barrier * glass slides * cover slips * light microscope * Forceps * Knife * filter paper * Dropper
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