reduction potentials is an e.m.f value of a given half-cell in relative to hydrogen cell. Galvanic cell - when zinc metal placed in CuSO4 solution‚ following reaction takes place: Oxidation: Zn(s) Zn+2 + 2e-1 Reduction: Cu+2 + 2e-1 Cu Overall: Zn(s) + Cu+2 Zn+2 + Cu(s) The salt bridge is necessary to complete the circuit and maintain charge neutrality. Zn+2 cathode SO4-2 anode Measuring the strength of oxidizing and reducing agents – standard electrode potentials provide
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Investigation: Developing an Activity Series for Metal Copper (II)‚ Magnesium and Nickel Tong Wu Question: “What is the effect of solution type and metal type on metal reactivity as measured by whether a chemical reaction has taken place? ” Prediction: *Using metal magnesium as an example illustration I. (Magnesium reacts with lead (II) nitrate) Mg + Pb(NO3)2 Pb + Mg(NO3)2 II. (Magnesium reacts with zinc nitrate) Mg + Zn(NO3)2 Zn + Mg(NO3)2 III. (Magnesium reacts with
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Material (+ & -) Temperature Range °C (°F) Sensitivity@ 25°C (77°F) µV/°C (µV/°F) E Chromel & Constantan (Ni-Cr & Cu-Ni) -270~1000 (-450~1800) 60.9 (38.3) J Iron & Constantan (Fe & Cu-Ni) -210~1200 (-350~2200) 51.7 (28.7) K Chromel & Alumel (Ni-Cr & Ni-Al) -270~1350 (-450~2500) 40.6 (22.6) T Copper & Constantan (Cu & Cu-Ni) -270~400 (-450~750) 40.6 (22.6) R 87% Platinum/ 13% Rhodium (Pt & Pt-Rh) -50~1750 (-60~3200) 6 (3
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Journal of Environmental Sciences 20(2008) 1–13 Research progress of novel adsorption processes in water purification: A review QU Jiuhui ∗ State Key Laboratory of Environmental Aquatic Chemistry‚ Research Center for Eco-Environmental Sciences‚ Chinese Academy of Sciences‚ Beijing 100085‚ China. E-mail: jhqu@rcees.ac.cn Abstract As an effective‚ efficient‚ and economic approach for water purification‚ adsorbents and adsorption processes have been widely studied and applied in different aspects
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Cu2+ (aq) + Zn (s) Cu (s) + Zn2+ (aq) E°cell = 1.06 V Cu2+ (aq) + 2e-
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English/Romanian Legal Glossary DICTIONAR DE TERMENI JURIDICI 1203.03 PC MOTION – Request to cancel‚ modify‚ change or terminate probation. MOTIUNEA PC 1203.03 – Cererea de anulare‚ modificare‚ schimbare sau incheiere a unei perioade de proba. 1203.4 PC MOTION – Request to take back guilty plea or set aside a guilty verdict‚ and dismiss the accusations or information. (Made after probation has either terminated or defendant was discharged from probation prior to termination.) MOTIUNEA PC
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(III) ion‚ in acid medium. c) the reduction of manganese dioxide‚ in acid solution‚ to give manganese (II) ion. 6. When copper metal is placed in concentrated nitric acid‚ the solution turns green and brown coloured NO2 gas evolved. Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) a) Which element is reduced? b) Which element is oxidised? c) Which is the oxidising agent? d) Which is the reducing agent? 7. When metallic zinc is added to an aqueous solution of silver nitrate‚ zinc dissolves
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Dilute NaOH Mg Silver None None None None Base Fizzes‚ gas‚ increased temperature None Cu Brown None None None None Base None None Zn Silver None None None None Base Fizzes None MgO White Slight odor None None Bubbles Base Dissolves‚ turns yellow‚ increased temperature None CuCO3 Green None Melts‚ turned black and Gas Dissolves None Base Fizzes Turns blue Cu(NO3)2 Blue None Dissolves and turns green None Dissolves‚ turns green‚ gas Acid Dissolves
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return he beaker‚ with its contents‚ to your teacher for proper disposal. Do not pour anything down the drain. 5. Set up the filtration apparatus to collect your Cu from the AlCl₂. solution. Find the mass of your dry paper before you filter. 6. Remove Al from the filter paper‚ carefully rinsing them with water to prevent loss of Cu. 7. Dry Cu overnight and then find the mass when dry. Observations: Material Before After CuCl₂ -blue powder -crystalline solid
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an unknown sample. Therefore‚ it is useful to perform all of the characteristic reactions first on a mixture of ions of known identity‚ and then proceed to the unknown sample. Reactions Characteristic for Pb+2 Separation of Pb+2 from Fe+3‚ Al+3‚ Cu+2‚ and Ca+2 Out the five cations in the mixture‚ only lead ion will precipitate‚ as PbCl2‚ when hydrochloric acid is added to the solution. Pb2+ (aq) + 2Cl- (aq) PbCl2 (s‚white) Equation 1 The solid PbCl2 is separated from the solution containing
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