Exposure to radon gas‚ that is released from soil and building materials‚ is the second leading cause of lung cancer in well-developed regions as Europe and North America. Other risk factors for lung cancer are secondhand smoke exposure‚ asbestos‚ certain metals‚ exhaust gases and other organic
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hear their parent’s footsteps coming toward their room. “Some teenagers have bad grades‚ having a difficult time concentrating and falling asleep‚ hours of night-time use‚ frequent complaints of being tired‚ school lateness or absences‚ and withdraw from all activities such as sports practices‚ friends‚ social engagement and music lessons.” (Source 1) I believe that teens who spend significant amounts of time can suffer depression‚
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Of all the elusive‚ seductive concepts shared by the disciplines of literary studies‚ art‚ and psychology‚ genius is among the most scoffed at‚ the least understood. To hear‚ as I have heard‚ a literature professor say that he "doesn’t believe in genius‚" as if millions of people haven’t attained I.Q. scores in excess of 140‚ or as if anyone‚ if he or she only worked vigorously enough‚ could pen a single work comparable to The Canterbury Tales or Paradise Lost or The Rape of the Lock‚ is to know
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One of the most known theories is the Activation Synthesis Theory. J. Allan Hobson developed this theory in the late 1970s after running an experimental study on cats focusing on rapid eye movement sleep (REM) (Domhoff‚ 2003). The Activation Synthesis Theory simply states that our cerebral cortex is trying to interpret random electrical activity we have while sleeping. Hobson argued and quoted that random electrical signals from the brainstem force the cortex to make “the best of a bad job
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the gravity filter and the Hirsch funnel‚ as it was difficult to obtain the entire product from the filter paper and the sides of the funnel. As the experiment follows a semi microscale technique even a small amount of lost product yields a great loss in the yield 4. These sources of error could be minimized by doing a larger reflux in order to increase the yield. However‚ as the purpose was to simply synthesis SnI4 in order to identify the stable oxidation states (the melting point range requires
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synthesizing p-Aminophenol with Acetic anhydride. This reaction occurs when the amine group of the p-aminophenol is acetylated by the acetic anhydride. The resultant is an amide functional group (Ellis‚ 2002). However‚ the product that is obtained from this product is a crude solid which cannot be used as an analgesic and therefore the crude solid must be purified. This purified product is what is later put into the analgesic. In this experiment‚ the procedures that are important are vacuum filtration
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In both the poems‚ “Five AM” by Estate of William Stafford and “Five Flights Up” by Elizabeth Bishop‚ they reflect upon the speaker’s early morning surroundings‚ but through different speaker’s point of view. Strafford employs stanzas‚ asyndeton‚ and personification to describe the morning surrounding and the state of mind‚ while Bishop utilizes injection‚ simple sentence and asyndeton. Strafford sets the scene with a peaceful tone and progresses into a rejuvenated tone. Bishop‚ on the other hand
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Rebecca Boreham 7/1/14 Chem 2423 Experiment #5 Synthesis of Aspirin Elizabeth Ajasa Kaylee Seymour Lauren Hatfield Suveda Perikala Introduction/ Purpose Aspirin is the most commonly used drug in the United States. Forty million pounds are produced each year. The chemical name for aspirin is Acetylsalicylic acid. Aspirin is a pain reliever and a fever reducer. Aspirin originated from the bark of a White Willow Tree. Chewing the bark however is extremely acidicand irritates the mucous membranes
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Synthesis of Aspirin (Acetylsalicylic Acid) Abstract: This experiment is about the synthesis of aspirin under laboratory conditions. Aspirin is prepared by reacting salicylic acid and acetic anhydride; in the presence of sulfuric acid. After fully dissolving the salicylic acid with acetic anhydride‚ the solution is cooled and cold water is then added. Once the crystals form they are then filtered and left to dry out. There mass is measured and recorded then the yield is calculated. Introduction:
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Procedure The procedure stated in Chem 2120 experiment 6 Williamson Ether Synthesis of Phenacetin laboratory manual was followed without any major changes. Data and results Compound Amount used MW (g/mol) Moles Stoichiometry/Comments acetaminophen 0.354 g 151.16 2.34 x 10-3 limiting reagent ethyl iodide 0.3mL 155.97 3.75 x 10-3 1.6 equiv ’s sodium ethoxide 2.6mL 68.05 3.3 x 10-2 catalyst‚ reaction solvent crude product obtained: phenacetin 0.32g
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