Copper Cycle Summary During the copper cycle lab‚ my partners and I performed a series of reactions on copper powder and observed the changes it underwent. For the first step‚ we mixed nitric acid and copper powder‚ and noticed that a yellowish brown gas emerged‚ along with effervescence. The red solid disappeared and became a blue liquid. We know that we produced copper nitrate‚ nitrate gas‚ and water because the only two blue solutions in “A New Language” are copper sulfate and copper nitrate
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replacement‚ neutralization and decomposition. There are five reactions that the copper will go through. 1. Cu(s) + 4HNO3(aq) --- Cu(NO3)2(aq) + 2H2O(aq) + NO2(aq) 2. HNO3(aq) + NaOH(aq)--NaNO3(aq) + H20(l) 3. Cu(OH)2(s)--CuO(s) + H2O(l) 4. CuO(s) + H2SO4(aq)-- CuSO4(aq) +H2O(l) 5. CuSO4(aq) + Zn(s)-- ZnSO4(aq) + Cu(s) At the end of reaction number five we should have close to 100% of the copper we started out with. Result Original Mass of Cu=.452g Mass of Cycled Cu=2
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their dad. The movie also follows other characters who are very close friends of the family. The dad in the movie is master chu‚ He is a widowed master chief who has raised his three daughters. His daughter’s names are Jia-Jen who is his youngest‚ Jia-Chien who is the middle daughter and Jia-Ning who is the eldest of chu’s daughters. In this movie the women all lead very different lives‚ Though they live different lives when it comes to finding love‚ dealing with their dad and making family announcement
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Introduction A key concept in evolutionary biology is that divergent selective regime will often generate and maintain some type of phenotypic diversity (Langerhans et al. 2003). This divergent selection can lead to differences in phenotypic expression either by a genetic differentiation or phenotypic plasticity (Levins‚ 1968; West-Eberhard‚ 1989: Robinson and Wilson‚ 1994; Orr and Smith‚ 1998; Schluter‚ 2000; cited in Langerhans‚ 2003). Such divergence is significant as it can influence microevolutionary
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SULIT 1 4541/1 Peraturan Permarkahan CHEMISTRY 4541 Kertas 1 Ogos 2011 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011 CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 1 4541 /1 © Trial2011 Hak Cipta Sekolah Berasrama Penuh http://cikguadura.wordpress.com SULIT SULIT 2 SKEMA KERTAS 1 CHEMISTRY 4541/1 4541/1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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Week 10: Oxidation and Reduction Reactions: The Reactions of Copper Data: Part I: Preparing a solution of copper (II) nitrate Initial mass of copper wire: .520g Mass of copper wire after vigorously scouring: .518g Observations of Copper (II) ribbon mixed with HNO3: Solution turned green. Thick brown gas formed. Copper (II) bubbled vigorously. Cu (II) dissolved‚ solution appeared green/blue. After the addition of H2O a blue crusty precipitate formed. Part II: Synthesis of solid copper
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compounds‚ the purpose was to recover the original amount of copper after series of chemical reactions. Then returning the copper back to its original form. The copper wire originally weighted 1.0099 g‚ but after the copper was transformed into Cu(OH)2 to CuO to CuSO4 and finally into Cu‚ the mass of the recovered copper was 1.1023g; the percent yield was 109%. Since the percent yield is more than 100%‚ an error must have occurred somewhere in the lab. A possible error could have occurred due to removing
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First‚ prepare a data table. Record what you see throughout the laboratory activity. Your teacher will demonstrate for the class the reaction of metallic copper with concentrated nitric acid‚ HNO3. This must be done in the fume hood. (Caution: Avoid breathing poisonous gases. Avoid contact of skin with nitric acid. It burns skin and clothing.) One student will be asked to feel the side of the demonstration beaker and report to the group. The products formed are copper(II) nitrate solution‚ Cu(NO3)2(aq)
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The influenza virus has had detrimental effects on society throughout history. In 1918‚ the influenza strain H1N1 caused a global pandemic (Billings‚ 1997). One of the major problems with the spread of H1N1 was that soldiers were living in terrible conditions throughout Europe and were susceptible to the virus (Billings‚ 1997). Soldiers travelled worldwide‚ spreading the incredibly fatal virus that had no known vaccine to their families and friends (Latson‚ 2015). The symptoms of the Spanish flu
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------------------------------------------------- Abstract Nanofluids‚ the fluid suspensions of nanomaterials‚ have shown many interesting properties‚ and the distinctive features offer unprecedented potential for many applications. This paper summarizes the recent progress on the study of nanofluids‚ such as the preparation methods‚ the evaluation methods for the stability of nanofluids‚ and the ways to enhance the stability for nanofluids‚ the stability mechanisms of nanofluids‚ and presents
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