used is iodine-thiosulfate titration. It is a very useful method‚ since the iodide ion‚ I-‚ is easily oxidized by almost any oxidizing agent. The analysis takes place in a series of steps as follows: 1. A diluted sample of the bleach will be allowed to react with potassium iodide in acidic solution. The iodide ion will be oxidized to iodine while the hypochlorite ion will be reduced to chloride (Equation 1). 2 H+(aq) + OCl-(aq) + 2 I-(aq) ! Cl-(aq) + I2(aq) + H2O(l) (1) Iodine is not very
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coli ) is a negative gram bacteria which stain pink colour ‚ while Staphylococcus aureus ( S.aureus ) is a positive gram bacteria which stain purple colour. Materials Bacteria : Escherichia coli ‚ Staphylococcus aureus Crystal Violet Gram’s iodine Absolute alcohol Safranin Methodology As per manual. Discussion Gram staining is a very importance preliminary step to differentiate the bacteria into gram positive and gram negative and also enable the bacteria to be examined using a light
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work. This tells me that amylase will work the best at 40°C as it might be amylase’s optimal temperature. Variables: I will change the temperature‚ at which the solution is heated. I will measure the time it takes for the colour of starch and iodine mixture to disappear. The independent variable in this experiment will be the temperature and the dependent variable time taken between the mixing of amylase and starch solutions and the end of the test. The control variables will be: Volume
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�PAGE �7� �PAGE �1� THESIS I am referring to a condition called Hashimoto ’s Thyroid Disease‚ which is a common hypothyroid disorder found among many different people and countries throughout the world. As you read through this paper‚ you will learn the basics about Hashimoto ’s Thyroid Disease‚ including some of the causes‚ the signs and symptoms‚ and the treatment. OUTLINE Hashimoto ’s Thyroid Disease I. Introduction II. Description and History a. Thyroid b. Hashimoto ’s thyroiditis III
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Practical 12: Digestion in Humans Aim: To distinguish between 5 liquids to come to a conclusion from which region of the alimentary canal it was extracted from. Hypothesis In this practical‚ we have been given 5 unknown solutions hence it is not possible for us without any logical analysis to come up with a conclusion regarding the positioning along the alimentary canal. We cannot come up with a proper answer or predict results without running through the tests. I though can base my
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are the long chains of monosaccharide‚ which is called the polymer of carbohydrates. Monosaccharide and disaccharides can be tested by the Benedict’s test‚ as they are reducing sugars. Polysaccharides such as starch and glycogen can be tested by the iodine test. Also‚ carbohydrates are consumed to provide energy to our body and they are useful in metabolism. Therefore‚ it is one of the essential macromolecule that we have to consume. 2. Lipids Lipids are made up of a glycerol molecule and three fatty
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presence of iodine. The iodine molecule slips inside of the amylose coil.The amount of blue complex that starch gives with iodine can be measured by using a spectrophotometer. α-amylases are found in saliva‚ pancreatic juice‚ human breast milk‚ serum and certain tissues such as the liver. This enzyme catalyzes the hydrolysis of α (1-4) linkages in starch by breaking it down to maltose and some glucose. As the starch is broken down‚ the coiled structure of α-amylase is unfolded. Therefore‚ iodine will
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Title: Kinetics: The Rate of a Chemical Reaction Objectives: 1. To study the kinetics of chemical reaction‚ 2 I- + S2 O82- I2 + 2 SO42- . 2. To study the effects of reactant concentration (persulphate‚ S2O82-‚ and iodide‚ I-) and temperature on the rate of chemical reactions. ( i) Study the effect of 0.20M (S2O82-) on the rate of chemical reaction. ( ii) Study the effect of 0.10M (S2O82-) on the rate of chemical reaction. ( iii) Study the effect
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Chemistry project Aim: To compare rate of fermentation of given sample of wheat flour‚ gram flour‚ rice and potatoes. Submitted By: Name: Ipshita Chatterjee Class: XII – A Roll No.: 12 Index: S.no | | Page no. | 1. | Certificate | | 2. | Acknowledgement | | 3. | Declaration | | 4. | Objective | | 5. | Introduction | | 6. | Requirements | | 7. | Procedure | | 8. | Observations | | 9. | Bibliography | | Objective: In this experiment the main objective is to
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Test for Carbohydrates Result Starch suspension When the yellowish-brown iodine was added into the starch suspension‚ the starch suspension was changed into dark blue. Potato slide Discussion Starch suspension When the yellowish-brown iodine was added into the starch suspension‚ the starch suspension was changed into dark blue. This is due to the yellowish-brown iodine changed into dark blue when there is a presence of starch. This shows a positive test for
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