they have the same functional groups. A chemical test that is sensitive to these groups can be used to identify molecules that are in that class. This lab is broken down into four different sections‚ the Benedict’s test for reducing sugars‚ the iodine test for the presence of starch‚ the Sudan III test for fatty acids‚ and the Biuret test for amino groups present in proteins. The last part of this lab takes an unknown substance and by the four tests‚ determine what the substance is. BENEDICT’S
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reaction between Mg and halogenated aliphatic or aromatic halogenated‚ under common circumstances 1mol Mg is needed for 1mol of halogenated. Considered the side reactions‚ Mg should be in excess for about 10%-15%. The reactivity decrease from iodine to chlorine‚ but iodine also causes most side reactions‚ thus giving a lower product rate than Br or Cl. Also noted that chloride usually reacts very slowly with Mg. Gridnard reagent is very reactive‚ not only reacts with H2O or organic compound with acidic hydrogen
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different temperatures in Celsius 0‚ 23‚ 58‚ and 89 for both fungal and amylase. For 10 minutes‚ every 2 minutes we would use 3 drops of each amylase and mix it with iodine to observe the presence of starch at each temperature. We conducted this experiment for both bacterial and fungal amylase. Results were reached based on the color of the iodine and amylase mixture. Colors were classified from 1-5‚ 1 being a light yellow and 5 being a dark brown. A light-yellow color means starch is not present in the
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blended meat or egg whites d. Lipid Solution – vegetable oil‚ melted butter 2. Set up 4 lab stations (twice around the room) for students to rotate. Each station should have the materials needed to conduct one of the following tests: a. Iodine Test: starch + iodine (yellowish orange) blue-black Ex. Potato solution b. Benedict’s Test: monosaccharide + Benedict’s solution (light blue) green to red depending on concentration of sugars Ex. apple juice or glucose solution c. Biuret’s Test: protein
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minute. At altitudes greater than 6‚562 feet you should boil water for three minutes. 2. Chemical Treatment * If boiling water is not an option‚ you can chemically treat your water with halogens such as iodine and chlorine. There are many products on the market that include iodine or chlorine in liquid and tablet forms specifically for water purification. The effectiveness of these products depend on the temperature‚ pH level and clarity of the water. Be sure to check the expiration dates
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BAB I PENDAHULUAN 1.1. Latar Belakang Kraniotomi merupakan tindakan pembukaan tengkorak melalui pembedahan untuk meningkatkan akses pada struktur intrakranial (Brunner & Suddarth‚ 2010). Tindakan operasi kraniotomi dilakukan untuk menghentikan perdarahan‚ memperbaiki kerusakan lapisan jaringan yang melindungi otak dan patah tulang tengkorak akibat trauma‚ mengevakuasi masa yang ada didalam otak‚ mengeluarkan cairan serebrospinal yang berlebihan dan menghilangkan sumbatan darah daerah otak. Operasi
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Reactants Predictions Before Combining Observations After Combinin g Starch + I2 No reaction‚ starch will remain white Reaction; black deposits on the glass tube. Starch turns black Food coloring + NaOCl No reaction; will turn lighter Reaction; the solution that was dark blue turned into light blue Food coloring + CH3COOH No reaction; color will turn lighter No reaction; when both combined‚ the color (dark blue) remained the same Food coloring + NaOCl + CH3COOH No reaction; solution will remain
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halogen element Any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F)‚ chlorine (Cl)‚ bromine (Br)‚ iodine (I)‚ astatine (At)‚ and element 117 (temporarily named ununseptium [Uus]). They were given the name halogen‚ from the Greek roots hal- (“salt”) and -gen (“to produce”)‚ because they all produce sodium salts of similar properties‚ of which sodium chloride—table salt‚ or halite—is best known. Because of their great
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presence or absence of starch in the solutions using iodine (I2). Iodine forms a blue to black complex with starch‚ but does not react with glucose. If iodine is added to a glucose solution‚ the only color seen is the red or yellow color of the iodine. Therefore‚ the faster the blue color of starch is lost‚ the faster the enzyme amylase is working. If the amylase is inactivated‚ it can no longer hydrolyze starch‚ so the blue color of the starch-iodine complex will persist. You will also test for the
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Epidermal Cells Requirements: Iodine solution HARMFUL Onion Distilled Water Apparatus: Microscope Microscope slides & cover slips Tile Knife Tweezers Pasteur Pipettes Assignment: I was given the onion once it had been chopped up on the tile‚ ready for me to peel back the skin I required using the tweezers. I then placed piece of onionskin onto the microscope slide‚ making sure there were no folds or creases‚ and put a drop of iodine onto the slide as well‚ to view through
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