temperature. * Temperature influences time taken for iodine solution remains yellowish. No full marks will be given if students did not meet the 2 criteria of answer and the word ‘different’ / ‘influence’ is not specific. Students must try to avoid these words. Accurate response (3 marks): P1: Temperature of water bath P2: Time taken for iodine solution to remain yellowish (Horizontal observation) * At temperature 5˚C‚ time taken for iodine solution remains yellowish is 12 minutes. * At
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likely to suffer from severe acne. That is because the increase in growth hormone which causes the sebaceous glands in the skin become clogged. 3. Iodine Iodine may be one factor in the appearance of acne‚ such as skin oil glands which can irritate skin that is prone to acne. Iodine can be found in fish and shellfish because sea water contains iodine. In addition other sources comes from iodized salt which is a component of several types of canned food. 4.Caffeine and Alcohol Caffeine is considered
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peroxydisulfate ions (S2O82-) react with iodide ions (I-) in the presence of a starch indicator‚ they produce a dark blue solution. Reaction (1) S2O82- + 3I- I3- + 2 SO42- (peroxydisulfate ion) (iodide ion) (iodine ion) (sulfate ion) To determine the rate law for this reaction a series of changes in the concentration of peroxydisulfate‚ [S2O82-]‚ and a series of changes in the catalyst while mean the corresponding changes in time‚ t‚ needs to be observed
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Heironimus‚ White 3 There are four main macromolecules; proteins‚ nucleic acids‚ lipids‚ and carbohydrates. The presence of some of these‚ such as sugar‚ fat‚ starch‚ and protein‚ can be determined using tests such as Benedict’s solution‚ Lugol’s iodine solution‚ Biuret’s reagent‚ and Sudan III. Control tests were performed to determine what a positive result would appear like. Then the tests were performed using substances containing sprite‚ fries‚ hamburgers‚ and chicken nuggets. Results matching
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Differentiate between a differential stain and a special stain (how are they different‚ don’t simply identify the types of differential stains and special stains). What is the role of the Gram’s iodine in a Gram stain? What color would all bacteria become at the end of the staining procedure if the iodine in the gram step was omitted? What is the role of the alcohol wash in the Gram Stain? What color would all bacteria become at the end of the staining procedure if the alcohol step in the gram
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water‚ ev milk‚ 50% egg solution‚ 1% sucrose‚ 4 test tubes‚ 1 test tube rate‚ safety glasses‚ pipets and the reagent solution. For test 2 for starches the following materials were used: Di water‚ 1% starch solution‚ onion juice‚ sucrose solution‚ iodine reagent‚ 4 test tubes‚ test tube rack and pipets. In test 1 and test 2 each solution was placed in a separate test tube with the corresponding reagent added to each as well. In test one for proteins each substance that showed a purple color it indicated
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Thermochromism Thermochromism refers to the phenomenon of color changes by the agency of heat. Obviously‚ the color changes are made possible by the temperature-induced chemical or physical changes of materials incorporated into the inks. Sometimes‚ the color change occurring at a temperature is permanent‚ and at other times the original color can be regained on cooling. Accordingly‚ we have an irreversible or reversible thermochromic system. The required chemistry can be adopted based
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inhibitory (antimicrobial) activity against the organism. This experiment deal with the evaluation of antimicrobial activity of two antiseptics which are 5 % iodine and 5% formaldehyde‚ against two organism Pseudomonas fluorescens (gram-negative) and Serratia marcescens (gram-negative). MATERIALS Chemical agent to be tested (5 % iodine and 5 % formaldehyde) Cultures of Pseudomonas fluorescens and Serratia marcescens. Sterile petri dishes Liquid nutrient agar Sterile filter paper disc
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volumetric flask - graduated cylinder -beakers V.Experimental procedure: Reference experiment number 7‚lab manual phar 205‚2012 p.65 . VI.Theory: Rather than titrating directly with iodine‚an excess of iodine will be generated directly in the solution with ascorbic acid according to the following equation: IO3- + 5I- +6H+ → 3I2 + 3H2O Vitamin C is readily oxidized with I2 in acidic medium.
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Running Head: GRAVES’ DISEASE Graves’ Disease Graves’ Disease Graves’ disease‚ also known as toxic diffuse goiter‚ is the most common cause (80%) of hyperthyroidism in the United States (Rakel & Bope‚ 2008). Hyperthyroidism is a hypermetabolic disorder that occurs when the thyroid gland makes more thyroid hormone than the body needs (Nettina‚ 2006). Over activity of the thyroid gland leads to high levels of thyroid
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