VIHS/ Department of Chemistry Chemistry Revision Unit II (Edexcel) (01) a) When lithium nitrate and sodium nitrate are heated separately‚ both decompose giving oxygen gas as one of the products. (i) Which of these two nitrates would decompose at the lower temperature? .........................................................………………………………………….................... (ii) Give the name of any other product formed when sodium nitrate is heated. .....................................................
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If your goiter is due to an iodine deficiency‚ then obviously you will need to correct this deficiency. Many people with thyroid and autoimmune thyroid conditions do have such a deficiency‚ which can be determined through a 24-hour iodine loading urine test (or you can get a general idea of whether a deficiency exists through an iodine patch test). If it’s determined that you have an iodine deficiency‚ then it will be necessary to begin supplementing with iodine‚ which is what I did when I was
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element of cooking. Due to actions taken by the different health care organizations‚ people are being more and more aware of the importance of using iodized salt. People are looking forward to buy a product on which they can rely about their need of iodine. This calls for determining the consumer characteristics of our company. This report includes all the characteristics of its consumers. I think these things will highly benefit the organization. 1.2. Problem and purpose: The topic of the report
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Vitamin C (ascorbic acid) is an antioxidant. The amount of vitamin C content in food can be found out by titrating with an oxidising agent‚ e.g. iodine. In the reaction‚ vitamin C is oxidised‚ while iodine is reduced to iodide ions. The endpoint is determined by the formation of blue-black starch-iodine complex when all vitamin C is oxidised and excess iodine is free to react with the starch solution added as indicator. Introduction Vitamin C is an important component of a healthy diet. A well-balanced
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solution. We will analyze reactions in different pH ranges. The starch solution will appear blue when mixed with iodine. But after mixing the enzyme amylase to the starch‚ the starches are broken down into simple sugars. Now‚ when the iodine is added‚ no color change exist. Instruments and materials used: 1.) Dialysis bags x2 2.) Beakers 3.) Test tubes 4.) Water bath 5.) Iodine solution 6.) Starch solution 7.) String x4 8.) Dropper 9.) Thermometer 10.) Salty water for the easy
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membrane. Hence‚ this experiment is focused on diffusion and required to create a own model cell by pouring distilled H2O‚ starch‚ 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
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occurring in about 2% of women and only 0.2% of men (N4). If untreated‚ the effects of this disease can be very severe. There are several causes for hyperthyroidism‚ which may include Graves’ disease‚ thyroid nodules‚ thyroiditis‚ the intake of too much iodine‚ and the overmedication of synthetic thyroid hormone. The most common cause for hyperthyroidism is an autoimmune disorder called Graves’ disease‚ sometimes referred to as toxic diffuse goiter. With this disorder‚ the immune system synthesizes an antibody
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Metals and Halogens reactions Elements such as fluorine‚ chlorine‚ bromine‚ iodine‚ and astatine belong to Group 7‚ Halogens. At room temperature‚ fluorine is a yellow gas‚ chlorine is a pale green gas‚ bromine is a red liquid‚ and iodine is a purple solid. Astatine is a radioactive element‚ therefore it exists only in small amounts. All the halogens exist in diatomic molecules. They have high ionization energies and are the most electronegative elements. Their electron configuration ns2 np5 make
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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 water. Add iodine solution until the water is quite yellow/brown.
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acid‚ reacts with iodine rapidly in an acidic medium. C6H8O6 (aq) + I2 (aq) C6H6O6 (aq) + 2H+(aq) + 2I- (aq) Since iodine dissolves slightly in water‚ ascorbic acid cannot be titrated directly by a standard solution of iodine. Therefore‚ back titration technique is employed in this experiment. In an acidic medium‚ potassium iodate(V) reacts with potassium iodide to produce iodine in situ. KIO3 (aq) + 5KI (aq) + 3H2SO4 (aq) 3I2 (aq) + 3H2O (l) + 3K2SO4 (aq) The iodine produced reacts
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