repeated thrice. Observed changes were recorded and compared to controlled results from previous studies. Results of the preliminary and confirmatory tests have shown that the solution contained calcium (Ca2+)‚ ammonium (NH4+) and thiocyanate (SCN-) in all replications. Keywords: unknown analysis‚ cations‚ anions‚ calcium‚ ammonium‚ thiocyanate‚ preliminary tests‚ confirmatory tests Introduction Analytical chemistry has two divisions‚ namely: qualitative analysis and quantitative analysis
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Hero is not just a title and to be a true hero it takes more than getting your elderly neighbours cat out of the tree. Throughout the play it is also safe to say Brutus is not a villain. The best category for Brutus falls under the personnel of a tragic hero. Throughout the play it is obvious to the reader that Brutus is loved by most‚ including Caesar. Secondly‚ Brutus revolves his actions around the people of Rome and less his own wants/needs. Lastly‚ he can not be classified a true hero because
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including animals‚ plants and many tiny microbes. The study of circadian rhythms is called chronobiology. The "master clock" that controls circadian rhythms consists of a group of nerve cells in the brain called the suprachiasmatic nucleus‚ or SCN. The SCN contains about 20‚000 nerve cells and is located in the hypothalamus‚ an area of the brain just above where the optic nerves from the eyes cross (Circadian Rhythms). Some of the factors that can affect a biological rhythm include delaying bedtime
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reaction with H2 SO4 gives a gas C and a compound D. Bubbling C into an aqueous solution of B gives white turbidity. The aqueous solution of compound D‚ on exposure to air‚ with NH4 SCN gives a red compound E. The compounds A and E respectively‚ are: A. PbS and Pb(SCN)2 . B. NiS and Ni(SCN)2 . C. FeS and Fe(SCN)3 . D. CoS and Co(SCN)2 . 25. Using the diagram given below‚ the relation between k1 and k2 for the reaction A → C is: A. k1 = k2 . B.
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Experiment 4 Guide Questions for Discussion Iron-Silver Equilibrium 1. Give the balanced net ionic equation for the reaction between Fe2+ and Ag+. What is the chemical formula of the gray precipitate? Answer: Fe2+(aq) + Ag+ (aq) Fe3+(aq) + Ag (s) The formula of the precipitate is Ag(s). 2. Give the balanced net ionic equation for the reaction of Fe2+ with Fe(CN)63-. a. What is the chemical formula of the Prussian blue precipitate? b. How does
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presence for FE 2+‚ Fe3+ and Ag+ because of the visible change of color of Prussian blue precipitate‚ blood red solution and white precipitate. The balance chemical equation for the reactions were Fe2+ + K3Fe(CN)6 - Fe(CN)36 +K2 +Fe ‚ Fe3+ + KCSN Fe(SCN)3+K and Ag+ + HCI AgCl + H+. The bonding between the ions in the solution is weak because it can be separated easily and they are very reactive to the
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KFe[Fe(CN)6](s) The precipitate which is KFe[Fe(CN)6](s) is a prussian blue precipitae which indicates the presence of Fe2+ ions. Next‚ for Fe3+‚ KCNS was added in the supernate shown in this net ionic equation: Fe3+(aq) + SCN-(aq) Fe(SCN)2+(aq) A blood red solution was achieved which indicates the presence of Fe3+ ions. Lastly‚ for the Ag+ test‚ the HCl was added to the supernate shown in the ionic equation below: Ag+(aq) + Cl-(aq) AgCl(s) A white precipitate
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Thiocyanatoiron (III) Ion Table 2 Reagent Added | Stress (Ion Added) | Spectator Ion | Observation | Direction of Equilibrium Shift | KCl | None | K⁺‚ Cl⁻ | No Change | No Change | Fe(NO₃)₃ | Fe³⁺ | NO₃⁻ | Solution Darkens | Right | KSCN | SCN⁻ | K⁺ | Solution Darkens | Right | NaOH | OH⁻ | Na⁺ | Solution Lightens ppt. | Left | Part III: Equilibrium Involving Cobalt (II) Complexes Table 3 | Stress | Colour Observation | Direction of Equilibrium Shift | Step 3 | H₂O Increases
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from the Dell experience. According to Michael Cannon‚ Dell’s President of Global Operations‚ the key differentiators that have made Dell so effective for nearly two decades are its made to order direct sales model and its innovative supply chain (SCN‚ 2008). Historically‚ personal computer companies produced most of the components for a computer which they assembled into their final products and distributed to resellers. The manufacturing of these components was vertically integrated into the
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Spectrophotometric Determination of Equilibrium Formal Report Matt DeLuca The Department of Chemistry‚ SUNY College at Brockport Brockport‚ NY 14420 CHM 206.04 Abstract: The main objective of this experiment was incorporating the use of spectrophotometry in an attempt to study the position of equilibrium. Furthermore‚ after the completion of this experiment‚ the formation of the equilibrium constant of the iron thiocyanate complex
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