to remove the impurities. By adding an excess of sulfuric acid and cooling the solution in an ice bath‚ the technique of vacuum filtration using a Buchner funnel will be employed‚ crystals of the hydrated aluminum potassium sulfate salt will yield and these will be collected. Methanol will be used to rinse the crystals. THEORY Aluminum is the third most abundant element and is commonly used in packaging. In fact‚ 97% of all soft drink cans use this universal material. Recycling an aluminum can
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Jonathan Ramos CWP 102 Final Paper May 2‚ 2011 Bermuda Triangle The Bermuda Triangle has acquired the name “The Devil’s Triangle”. We can owe this to people’s suspicions of its evils. There are many stories about aircraft and ships along with the people‚ allegedly disappearing mysteriously and other stories about people stating that they were warped through time after only being in the region of the Bermuda triangle for less then 5 minutes and arrived at a totally different
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could be produced‚ dicyclopentadiene had to be cracked to get cyclopentadiene for the starting material. Cyclopentadiene and maleic anhydride were mixed together and cooled to room temperature‚ which produced crystals. The solvent was pipette out of the tube to separate the crystals. The crystals were then scraped on the filter paper to get weight and melting points. The end product yielded 82.6%. The melting point was observed at 162-163°C. This indicated a close to pure substance with the actual
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CHAPTER 3: CRYSTAL STRUCTURES & PROPERTIES ISSUES TO ADDRESS... • How do atoms assemble into solid structures? (for now‚ focus on metals) • How does the density of a material depend on its structure? • When do material properties vary with the sample (i.e.‚ part) orientation? Chapter 3- 1 ENERGY AND PACKING • Non dense‚ random packing Energy typical neighbor bond length typical neighbor bond energy • Dense‚ regular packing r Energy typical neighbor bond length
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lifetime she made not one‚ but five discoveries. Each discovery was more complex than the other. Dorothy was born on May 12‚ 1910 in Cairo‚ Egypt. She was a scientist that spent her life studying different kinds of crystals. At the age of ten‚ she became interested in chemistry and crystal. This interest was encouraged by Dr. A.F. Joseph. Dr. A.F. Joseph was a friend of her parents in the Sudan and he gave her chemicals and helped her during her stay there to analyse ilmenite. She heard about chemistry
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allowed to cool to room temperature‚ and purple crystals were observed. 6 1.3mL of methanol was added to the vial as it was stirred at room temperature. 7 The vial was then placed in an ice bath for further cooling. 8 The purple crystals were collected and were dried using vacuum filtration with a Buchner funnel. 9 The crystals were washed with ice-cold methanol until the filtrate was a purple-pink color‚ and were then left under vacuum. 10 The dried crystals were placed in a test tube‚ and 178 mg of diphenylacetylene
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thinner and is located between space of the outer and inner cytoplasmic membrane. cell wall contains LPS which make them virulent C. What is the purpose of crystal violet in the Gram’s stain procedure? Crystal violet stain is a histological dye used as a stain in Gram’s Method of categorizing bacteria. The purpose of crystal violet in the Gram’s stain procedure is to differentiate bacteria into two different groups of pink and purple colours with gram positive being purple and gram negative
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compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are in cold liquids. If a saturated hot solution is allowed to cool‚ the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration. (orgchem.colorado.edu) A desirable solvent for crystallization has the following properties: 1) dissolves the solute readily at an elevated
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day a black crystal fell from the sky and impacted itself into the ground. No one thought anything of it as crystals of all shapes‚ sizes‚ and color always landed on Crystone so they just continued on normally. There was only one gem who thought the black crystal was weird and his name was Diop. Everyday he would walk past the crystal and examine it wondering what it was about. People would pause and tell him that he is worrying over nothing but he was not so sure about that as the crystal made him
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Engineering Materials Week 2-Interactivity 3.1 What is the difference between crystal structure and crystal system? A crystal structure is described by both the geometry and atomic arrangements within cell‚ whereas a crystal system is described only in terms of the cell geometry. 3.2 For cubic crystals‚ as values of the planar indices h‚ k‚ and l increase‚ does the distance between adjacent and parallel planes (i.e.‚ the interplanar spacing) increase or decrease? Why? The interplanar spacing
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