The Earthquake-Resilient Building The Brilliant Idea: A replaceable‚ building-wide system to help hospitals‚ apartment buildings and office towers survive severe seismic shaking. By Logan Ward and the Editors of Popular Mechanics September 30‚ 2010 6:30 AM Elastic high-strength steel cables run down the center of the system’s frame. The cables control the rocking of the building and‚ when the earthquake is over‚ pull it back into proper alignment. A steel frame situated around a building’s
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How Acid Rain Affects Organisms in Aquatic Biomes Through the advancement of technology‚ the issue of the air surrounding the earth might have been one of the most often matters to be brought up and discussed among scientists and engineers. Acid rain is one of the more serious environmental problems and it is closely related to the air pollution. Nowadays‚ it has affected large part of US‚ Europe and Canada. People start to be concerned about acid rain since it is getting worse in the passed
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Chemical Reactions and Equations Chemical Reaction: The transformation of chemical substance into another chemical substance is known as Chemical Reaction. For example: rusting of iron‚ setting of milk into curd‚ digestion of food‚ respiration‚ etc. In chemical reaction new substance is formed which is completely different in properties from the original substance‚ so in a chemical reaction chemical change takes place. Following are the signs of chemical reaction: (a) Change of state of substance
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Exercise 14: Qualitative Anion Tests PURPOSE: The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification. PROCEDURE: You must first determine to which of the three groups the various anions belong. Since no two people observe the same event in exactly the same way it is important to also conduct specific confirmation tests on the known samples of each anion. This information will help identify the anion
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Coral Reefs‚ Our Disappearing Beauty Coral reefs are one of nature’s riches ecosystems with a diverse existence of life which is ultimately quite complex. They are a colorful ecosystem that plays an important role in the marine world and the human world as well. They are home to countless plants and animals‚ a source of food‚ medicines and one of the unique wonders of our world. While they might bring the image of life near a tropical paradise‚ there is much more to the coral reef than
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figure out the actual yield vs. the theoretical yield and to calculate the percent yield. Procedure First‚ 1.0 g of CaCl2·2H2O was put into a 100-mL beaker and 25 mL of distilled water was added. The two ingredients were stirred to create a calcium chloride solution. Then‚ stoichiometry was used to determine how much Na2CO3 was needed for a full reaction: First‚ 1 g of CaCl22H2O was converted to moles: 0.00680 moles. The mole ratios of CaCl22H2O and Na2CO3 was seen to be 1:1. Then‚ moles of
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Kelvin of 1.0 dm3 of an ideal gas is doubled and its pressure is tripled. What is the final volume of the gas in dm3? A. B. C. D. 5. What volume of 0.500 mol dm–3 sulfuric acid solution is required to react completely with 10.0 g of calcium carbonate according to the equation below? CaCO3(s) + H2SO4(aq) CaSO4(aq) + H2O(l) + CO2(g) A. 100 cm3 B. 200 cm3 C. 300 cm3 D. 400 cm3 6. What volume‚ in cm3‚ of 0.200 mol dm–3 HCl(aq) is required to neutralize 25.0 cm3 of 0.200 mol dm–3 Ba(OH)2(aq)
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Name: Soo Jin Park Date: 03/30/2015 Exp 4: Properties of Gases Lab Section: 73426 Data Tables: Hydrogen Step B: Describe the zinc and acid reaction. As placing a small piece of Zn(mossy zinc) metal into the test tube containing the diluted HCI(Hydrochloric Acid) solution‚ gas bubbles rose from the solution slowly at the beginning and vigorously in process of time. As this reaction continued for a long time‚ transparent solution turned into white opaque color and black precipitates were formed
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0.0899 g/L 1.640 g/L 1.54 g/L 1.25 g/L 1.34 g/L 1.43 g/L 2.532 g/cm 3 2.165 g/cm 3 2.92 g/L 1.00 g/cm 3 −101 −35 −259 −115 −85 −253 −85 −61 −210 −164 −218 851 801 −73 −196 −152 −183 Decomposes 1413 −10 100 Oxygen Sodium carbonate Sodium chloride Sulfur dioxide *Water (at 4°C) 0 NCDPI Reference Tables for Chemistry (October 2006 form A-v1) Page 2 Formulas D= m V D = density K = °C + 273 PV1 PV 1 = 2 2 T1 T2 Pt = P1 + P2 + P3 + ... M1V1 = M2V2 PV = nRT
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Sugar (Sucrose)- C12H22O11 Vitamin C (Ascorbic Acid)- C6H8O6 Aspirin (Acetylsalicylic Acid)- C9H8O4 Common Name | Chemical Name | acetone | dimethyl ketone; 2-propanone (usually known as acetone) | acid potassium sulfate | potassium bisulfate - used in the conversion of tartrates to bitartrates in wine. | acid of sugar | oxalic acid – used in cleaning or bleaching‚ especially for the removal of rust (iron complexing agent) | ackey | nitric acid | alcali volatil | ammonium
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