Thermal Physics Why a Gas Exerts a Pressure Consider the molecules of a gas moving at random in a container‚ as shown below. The molecules are continually colliding with each other and with the walls of the container. (On the diagram‚ only a few paths of molecules have been drawn because...it’s a bit tedious drawing them!) It is assumed that all collisions are elastic. (Consider what would happen if the collisions were not elastic.) When a molecule collides with the wall‚ a change of
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Pellagra is caused by the deficiency of niacin and/or tryptophan in our diet. Niacin also called vitamins B-3 is a water-soluble vitamin‚ it means it is not stored in the body and they are excreted from the body through urine or feces. That is the reason why the body need regular supply of this vitamins in our diet. Its main function is to help the cellular metabolic pathway to convert food to energy. Niacin is found in poultry‚ tuna and other fish‚ enriched bread and cereals‚ beef‚ and peanuts
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Osmosis is the diffusion of a solvent across a selectively permeable membrane that occurs in response to differences in solute concentrations (Allen and Harper 2014).Osmosis can fall under the category of passive transport which does not require energy. With osmosis being a type of diffusion it is viewed as molecules moving from a high concentration to a low concentration. To further explain if there is a low water concentration‚ high amounts of solutes will be present. Water will most likely move
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tarnishing. Silver coins also used to be used in the ancient world but has been stoped today. Silver is also used in the making of jewellery‚ cutlery‚ and decorative. Silver is also in batteries. Silver Nitrate (agNO3) is used in photo films. Silver Iodide (AgI) is used to see clouds to predict
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Title Laboratory Techniques and Measurements Purpose The purpose of this experiment is to determine mass‚ length‚ temperature‚ volume‚ and density of objects and liquids using common measuring devices and algebraic formulas. The metric system‚ the most common set of measurements used in science‚ which includes meters‚ liters‚ Celsius‚ and grams will be used. Procedure The following items were used within the experiment: (1) Metric ruler with centimeter (cm) and millimeter (mm)‚ (1)
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H. pylori were centrifuged and washed by PBS. Then‚ bacterial sediments were stained with propidium iodide as a fluorescent dye (PI; Sigma‚ USA) and incubated 30 min at 4°C. Afterwards‚ cell suspension analyzed by flow cytometer (FACS Calibur‚ Becton Dickinson). PI is easily able to distinguish populations of dead cells from viable ones. Meanwhile‚ impaired cell membrane let more propidium iodide to enter through the cell; fluorescent dye are not absorbed by viable cell due to its
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Applications of Le Châtelier’s Principle (September 11 - 15‚ 2014) **The purpose of this experiment was to visually observe the effects of how changing certain aspects of the reaction affected the observed equilibrium. PROCEDURE: Introductory activity Part A: Effect of Concentration: Two different temperature water baths were created‚ one at 65-70oC‚ the other ice‚ and set aside for Part B. 20 mL of potassium thiocyanate solution were poured into a petri dish. The initial color and all subsequent
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There are three reactions in the iodine clock reaction. The first reaction is IO3-(aq) + 3 HSO3-3 SO4-(aq) + I-(aq)+ 3 H+(aq)‚ where the iodate ions become iodide ions1. The second reaction is 6 H+(aq) +IO3-(aq) + 5 I-(aq) 3 I2(aq) + 3 H2O(l) where the iodate ions become molecular iodine2. The third reaction involves molecular iodine becoming a dark blue starch;I2(aq) + starch blue-black complex3. These three reactions react in a sequence. In any reaction the concentration is exponentially related
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Analysis of Alcohols‚ Aldehydes and Ketones Karl Wayne Mancao‚ Raphaell Mordeno‚ Andres Pastrana III*‚ and Shannen Peñaverde Department of Biology‚ University of Santo Tomas‚ Manila‚ Philippines Abstract The proponents have done several tests for identifying alcohols‚ aldehydes and ketones. These tests are Dichromate test‚ Tollens test‚ Lucas test‚ DNPH test and Iodoform test. Three samples got positive result in dichromate test and one in Tollens test. Lucas test got one sample that has
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Hydrogen is recognized as the simplest and lightest chemical element in the periodic table; even though it is identified as one of the top elements in abundance in the world (consisting of 0.9 percent of the total mass on earth)‚ it is considered to be the most abundant element in the entire universe. It is a gaseous element with the atomic symbol being H. It is usually categorized under the first group of the periodic table known as the alkali metals. It contains only one electron that revolves
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