If you’re into arts and crafts and interested in working in concrete art‚ learning how to create your own simple statues is a great first step. It’s a relatively easy way to get your feet wet‚ learn how to properly mix concrete‚ create a mold‚ and craft the concrete into a great shape. Creating The Statue Mold While some expert concrete artists can create statues directly in the clay‚ newer concrete artists should create a small clay mold over which to pour the concrete. Creating your own statue
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Nucleation As in solidification‚ nucleation occurs most easily on surfaces already present in the structure‚ thereby minimizing the surface energy term. Thus‚ the precipitates heterogeneously nucleate most easily at grain boundaries and other defects. Growth of the precipitates normally occurs by long-range diffusion and redistribution of atoms. Diffusing atoms must be detached from their original locations (perhaps at lattice points in a solid solution)‚ move through the surrounding material
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Testing for Ions Analysis Chemical Changes of Test Solutions Test Solution Silver Nitrate Barium Chloride Potassium Thiocyanate Sodium Sulfate - Stayed white in color - Turned cloudy in color - Precipitation formed in solution - Stayed white in color Potassium Chloride - Turned cloudy in color - Precipitation formed in solution - Stayed white in color - Stayed white in color Iron (III) Nitrate - Stayed orange in color - Stayed orange in color - Changed color from orange
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Company #1: Neils Bohr Equation: 3Na2CO3 + 2AlPO4 = 2Na3PO4 + Al2(CO3)3 Reaction: Double Displacement Company #2: Hello Equation: C5H12 + 8O2 = 5CO2 + 6H2O Reaction: Combustion Company #1 Neils Bohr 3Na2CO3
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II. LEARNING OBJECTIVES - To perform different types of chemical reactions including acid-base‚ precipitation‚ gas forming‚ complex compound forming and oxidation-reduction reactions. - To identify some of the products in these reactions and describe the chemical changes. - To write and balance the chemical equations for the reactions observed. III. EQUIPMENT AND REAGENTS 1. EQUIPMENTThirty test tubes One test tube rack Two test tube holders Two spatulas Three 250 mL beakers One stirring rodOne
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Drying the organic solvent. The organic solvent containing the neutral compound contains some dissolved water. If the solvent were evaporated at this point‚ the resulting solid neutral compound would be wet with water and would consequently be a gooey mess and would take a long time to dry. A drying procedure is therefore necessary to remove all traces of water before the solvent is evaporated. This procedure consists of two steps: (1) thoroughly mixing the solution with saturated aqueous sodium
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Purpose: The purpose of this lab was to determine the freezing point of pure water‚ the experimental van’t Hoff factor for a substance and the molar mass of an unknown solution. Reagents: 25mL deionized Water ¼ to ½ inches of rock salt 25mL Sodium Nitrate (NaNO3 ) 25mL unknown solution – handle unknown solution carefully Procedure: For part 1‚ the freezing point of deionized water was determined. An ice bath was prepared by filling a 600mL beaker ¾ full of ice and covered with ¼ to
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On the right in Figure 27 shown the power density spectral of noise measurements at low frequencies‚ from 1 Hz to 14 Hz and used commercial resistance of 1 kΩ to compare 2 different current generators. The curves in red color correspond KEITHLEY 2400 series and the curves in black color correspond to the ADRET current generator. The KEITHLEY generator slightly lower noise than ADRET generator. However‚ theoretically the differential measure with correct polarization can suppress this kind of noise
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Qualitative Test for Some Cations I (The Silver Group) Objective: At the end of the class the student should be able to: 1. Separate‚ detect and identify the ions in a given unknown solution possibly containing the ions of the silver group. 2. Identify the substance responsible for the positive result of each test 3. Point out the suitable conditions necessary for the detection process and the reasons for such conditions Introduction Procedure: 1. 3 test tube labeled 1‚2‚3 was obtained
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Introduction When extracting lipids or fats from foods‚ both the method as well as the solvents chosen to perform a complete‚ or close to complete extraction are important. If these two elements are not taken into consideration‚ the extraction may not be complete‚ or the extract may contain a large quantity of undesired impurities. The natural fats and oil are mixtures of glycerides of fatty acids. Fats and oils are naturally occurring organic compounds which belong to a large group of water insoluble
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