) +2OH-(aq.) ---- Cu(OH)2 (s) 2Cu2+(aq.)+SO42- (aq.) +2NH3(aq.)+2 H2O(l) ----- Cu(OH)2.CuSO4(s) +2NH4+ (aq.) Zn2+ (aq.)+ 2OH- (aq.) ---- Zn(OH)2 (s) Zn2+ (aq.)+2NH3(aq.)+ H2O(l) --- Ag2O (s)+ 2NH4+ (aq.) Fe3+ (aq.)+ 3OH- (aq.) ---- Fe(OH)3(s) Fe3+ (aq.)+ 3NH3(aq.)+ 3H2O(l) --- Fe(OH)3(s)+ 3NH4+ (aq.) Pb2+(aq.)+ CrO42-(aq.) PbCrO4(s) 2Cu2+(aq.)+[Fe(CN)6]4- (aq.) -----Cu2[Fe(CN)6] (s) Zn2+(aq.) + S2-(aq) ----- ZnS(s) 4Fe3+ (aq.)+3[Fe(CN)6]4-
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to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Data Table: Oxidation-Reduction | | Reactions | Mg in Na2SO4 → | | Zn in MgSO4 → | | Pb in Zn(NO3)2 → | | Pb in FeCl3 → | | Fe in CuSO4 → | | Questions A. Based on your observations make an activity series of the metals used. List
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following from strongest oxidizing agent to weakest oxidizing agent: Ce4+ Ce3+ Fe2+ Fe3+ Mg2+ Mg Ni2+ Sn 17.3: Cell Potential and Equilibrium ∆G=-nFEº Example: Using the data in table 17.1‚ calculate ∆Gº for the reaction: Cu2+ (aq) + Fe(s) Cu(s) + Fe2+ (aq) 17.4: The Nernst Equation What happens when concentration and temperatures are not standard? Nernst Equation Sometimes written as: Assuming 25ºC Example 1: What is
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of these. 3. Heat is evolved diving (a) Endothermic Reaction (b) Displacement Reaction (c) Combustion Reaction (d) Combination Reaction 4. Which of the following is not a balanced equation? (a) Fe + Cl2 → FeCl3 (b) Mg + CuSO4 → MgSO4 + C4 (c) NaOH + HCl → NaCl + H 2O (d) Zn + S → ZnS 5. The reaction between lead nitrate and potassium iodide present in aqueous solutions is an example of (a) Decomposition Reaction (b) Displacement Reaction (c) Double Displacement Reaction (d) Neutralisation Reaction
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www.kalvisolai.com 5 Mark Compulsory Problems with Solution 1 +2 CHEMISTRY Q. 70 Compulsory Problems with Solution Problems are solved in easiest way (As per Government Answer Key) www.kalvisolai.com 5 Mark Compulsory Problems with Solution 2 SALIENT FEATURES Dear Students ❆ Q.No: 70 is asked as compulsory problem in Govt Exam. ❆ Two problems to be answered out of four problems. ❆ To simplify the problem‚ hints and expected compounds related to molecular formula‚ general formula are
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changes such as freezing‚ melting‚ dissolving evaporating. Copper is a widely used metal‚ it is use in door handles‚ cooking pots‚ cars‚ swimming pool and hot tubes to control the yeast. Physical and chemical properties of copper: • Symbol : Cu • Atomic number: 29 • Highly electrical and thermal conductivity • State at room temperature : Solid • Brownish red colour • Melting point : 1083 C • Density : 8.93 g cm2 • Boiling point : 2595 C
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N10/4/CHEMI/SP2/ENG/TZ0/XX SECTION A Answer all the questions in the spaces provided. 1. The data below are from an experiment to measure the enthalpy change for the reaction of aqueous copper(II) sulfate‚ CuSO4 (aq) and zinc‚ Zn (s). Cu 2+(aq ) + Zn (s) → Cu (s) + Zn 2+(aq ) 50.0 cm3 of 1.00 mol dm–3 copper(II) sulfate solution was placed in a polystyrene cup and zinc powder was added after 100 seconds. The temperature-time data was taken from a data-logging software program.
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Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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I https://www.oppapers.com/join.php#submit . Experiments with Metals and Ions of Metals Introduction Metals are similar in their physical properties in general‚ but they are not identical. Most of the metals are solids; few of them are liquids‚ such as mercury and cesium. Density of metals is not similar also. For example‚ sodium has density of 0.97g/cm3 while lead has density of 11.4g/cm3. Melting point of sodium is 98.0oC while for lead it is 327.6oC. Metals have the capability
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Hydrometallurgy 105 (2010) 148–154 Contents lists available at ScienceDirect Hydrometallurgy j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / h yd r o m e t Treatment of copper flash smelter flue dusts for copper and zinc extraction and arsenic stabilization A. Morales a‚ M. Cruells b‚ A. Roca b‚⁎‚ R. Bergó b a b Universidad Católica del Norte‚ Department of Metallurgical Engineering‚ Antofagasta‚ Chile Universitat de Barcelona‚ Department of Materials Science and Metallurgical
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