Experiment 9 Empirical Formula of Zinc Iodide Objectives Upon completion of this experiment‚ students should have learned: 1. The law of conservation of mass. 2. How to calculate an empirical formula. 3. The concept of limiting reagents. Introduction Synthesis and the determination of empirical formulas are two extremely important parts of chemistry. In this experiment‚ you will synthesize zinc iodide and determine its empirical formula. The molecular formula gives the actual
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The fluid mosaic model of the cell membrane. What is the fluid mosaic model? The fluid mosaic model is a model conceived by S.J. Singer and Garth Nicolson in 1972 to describe the structural features of biological membranes. The membrane is described to be fluid because of its hydrophobic integral components such as lipids and membrane proteins that move laterally or sideways throughout the membrane. That means the membrane is not solid‚ but more like a ’fluid’. The membrane is depicted as mosaic
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10ml test tubes were set up‚ with one set for each of the following sample solutions: water‚ protein‚ starch‚ lipid‚ vitamin C and an unknown sample. 0.5 L of each solution was added to each tube. One drop of each of the three indicator solutions (iodine‚ Sudan III and Biuret & copper sulfate) was added to each sample solution to determine how that sample solution (and that type of macromolecule) would react with each specific indicator. The results were recorded in the data chart below. The identity
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conducting the Benedict and Iodine test. Theory The theory for this concept is that if in the benedicts test the carbohydrate reacts‚ it is a monosaccharide. If it reacts in the Iodine test it is a polysaccharide. If no reaction occurs in either test the carbohydrate is a disaccharide. Data Type of carbohydrate | Benedicts Test | Iodine Test | Monosaccharide | R | NR | Disaccharide | NR | NR | Polysaccharide | NR | R | Solution | Bendicts Test | Iodine Test | Honey | R | NR | Oats
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Experiment We tested the permeability of the dialysis tubing to glucose‚ starch‚ and iodine. Initially‚ glucose and starch were placed into the bag‚ and iodine outside of the bag in the beaker. We used the iodine test for the presence of starch which proved positive inside of the bag‚ and Benedict’s reagent for glucose which was positive outside of the bag. We therefore concluded that only small molecules like glucose and iodine can permeate through the bag‚ starch is too large. Introduction This lab
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population particularly in developing countries. This in effect contributes substantially to the global burden of diseases. It has been estimated that micronutrient deficiencies account for 7.3% of the global burden of disease‚ with iron‚ vitamin A and iodine deficiency ranking among the 15 leading causes of global disease burden. Fortification of food is considered to be one of the most cost-effective methods to addressing these widespread deficiencies. As defined by the Food and Agricultural Organisation
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whereas amylopectin is completely insoluble. The structure of amylose consists of long polymer chains of glucose units connected by an alpha acetal linkage. Amylose in starch is responsible for the formation of a deep blue colour in the presence of iodine (Frances and Ellie‚ 2008). Starch granules are more or less regular spheres which composed of a mass of radiating needle-shaped crystals when the granules are viewed under polarized light (Srilakshmi‚ 2003). Starch granules do not dissolve easily
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materials used are usually sensitive to radiation [1]. For instance‚ iodine-131 has a half life of 8 days which is long enough for it to concentrate in the thyroid gland‚ allowing doctors long enough to monitor its function‚ but not so long as to cause damage. Iodine-131 is one of the most widely used isotopes. It is supplied in capsules or liquid of a specific activity designed to be swallowed by patients. Iodine is a naturally occurring element known as Iodide. It has many uses in
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different tests - Iodine Test for starch and glycogen‚ Benedict ’s Test for reducing sugars‚ and Biuret Test for Proteins. However‚ only two macromolecules are being identified in this experiment - carbohydrates and proteins. There are 12 solutions to be tested in this experiment. The Iodine test is used to indentify starch and glycogen in the given solutions. Of the 12 solutions‚ solution 8 is a starch solution and solution 7 is a glycogen solution. Starch solutions turn blue-black when Iodine solution is
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ACKNOWLEDGEMENT This project was done with the aid of a lot of people. I take this chance to express my gratitude to Mrs. Hamidah Bt. Ahmad for the guidance and motivation that contributed tremendously to this project. My thanks and appreciations go to my friends in developing this project too. TITLE Analysis of Vitamin C in fresh brand orange‚ pineapple and apple juices. ABSTRACT Vitamin C plays an important role in our daily lives as a nutrition for our health. Tropical brand pineapple juice
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