2. Write balanced equations for each of the following by inserting the correct coefficient in the blanks. PbO2 + PbCl2 + Fe(NO3)2 + KCI FeCl2 + KNO3 Cu(OH)2+ CH3COOH - Cu(CH3COOH)2 + H2O 3. Identifying Types of Reactions: For each of the following reactions, identify the category of reaction. General categories: exchange; acid/base; combustion, decomposition, synthesis, redox (single displacement) Reaction Category Cu(NO3)2 + 2NaBr CuBr2 + 2NANO3

2. Write balanced equations for each of the following by inserting the correct coefficient in the blanks. PbO2 + PbCl2 + Fe(NO3)2 + KCI FeCl2 + KNO3 Cu(OH)2+ CH3COOH - Cu(CH3COOH)2 + H2O 3. Identifying Types of Reactions: For each of the following reactions, identify the category of reaction. General categories: exchange; acid/base; combustion, decomposition, synthesis, redox (single displacement) Reaction Category Cu(NO3)2 + 2NaBr CuBr2 + 2NANO3

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 80AP

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Why are we adding NH3 and write down the net reaction. CALCIUM PEROXIDE OCTAHYDRATE (CaO2.8H2O) SYNTHESIS CaCO3 + 2 HCl --> CaCl2 + CO2 + H2OCaCl2 + 2 NH3 + H2O2 + 8 H2O --> CaO2.8H2O + 2 NH4+ + Cl- 5 g of pure CaCO3 is added in small portions to 10 mL of water and 20 mL of 18% HCl in a 100 mL beaker and mixed with a bottle. During this process, the mixture should be boiled in order to remove the CO2 formed. When the CaCO3 addition is complete, it is observed that a sufficient amount of precipitate is formed at the bottom of the container. The solution is filtered while hot, the excess water is evaporated and cooled with ice water. Thereupon, he says 25-30 mL of 6% H2O2 solution, 5 mL. NH3 and 100 mL water are gradually added with stirring. After stirring for a while, the crystals formed are filtered, washed several times with water and dried in a desiccator.
The fat in a 1.821 g sample of potato chips is extracted with supercritical CO2. After extraction, the residue weighs 1.139 g. What is the fat content (% w/w) of the potato chips?
The commercial production of nitric acid involves thefollowing chemical reactions:4 NH31g2 + 5 O21g2¡4 NO1g2 + 6 H2O1g22 NO1g2 + O21g2¡2 NO21g23 NO21g2 + H2O1l2¡2 HNO31aq2 + NO1g2 (a) Predict what kind of reaction dopamine is most likely toundergo in water: redox, acid-base, precipitation, or metathesis?Explain your reasoning. (b) Patients with Parkinson’sdisease suffer from a shortage of dopamine and may need totake it to reduce symptoms. An IV (intravenous fluid) bag isfilled with a solution that contains 400.0 mg dopamine per250.0 mL of solution. What is the concentration of dopaminein the IV bag in units of molarity? (c) Experiments withrats show that if rats are dosed with 3.0 mg/kg of cocaine(that is, 3.0 mg cocaine per kg of animal mass), the concentrationof dopamine in their brains increases by 0.75 mM after60 seconds. Calculate how many molecules of dopaminewould be produced in a rat (average brain volume 5.00 mm3)after 60 seconds of a 3.0 mg/kg dose of cocaine.
A solution containing 0.402 49 g of CoCl2 ? xH2O (a solid with an unknown number of waters of hydration) was exhaustively electrolyzed to deposit 0.099 37 g of metallic cobalt on a platinum cathode by the reaction Co21 1 2e2¡Co1s2. Calculate the number of moles of water per mole of cobalt in thereagent. A good approach is to find moles of Co, moles of CoCl2, mass of CoCl2, and, by difference, mass of H2O in the sample.
A 1.1324 g sample of magnetite ore was dissolved in concentrated HCl to give a solution that contained a mixture of Fe2+ and Fe3+. Nitric acid was added and the solution was boiled for a few minutes, which converted all of the iron to Fe3+. The Fe3+ was then precipitated as Fe2O3*xH2O by addition of NH3. After filtration and washing, the residue was ignited at a high temp to give 0.5394 g of pure Fe2O3. What is the percent Fe and the percent Fe3O4 in the sample?
Arsenic(III) oxide (As2O3) is available in pure form and is a useful (but carcinogenic) primary standard for oxidizing agents such as MnO4-. The As2O3 is dissolved in base and then titrated with MnO4- in acidic solution. A small amount of iodide (I - ) or iodate (IO3-) is used to catalyze the reaction between H3AsO3 and MnO4-. As2O3 + 4 OH - 2 HAsO32- + H2OHAsO32- + 2 H+ H3AsO35 H3AsO3 + 2 MnO4- + 6 H+ 5 H3AsO4 + 2 Mn2+ + 3 H2O (a) A 3.209 g aliquot of KMnO4 (FM 158.034) was dissolved in 1.000 L of water, heated to cause any reactions with impurities to occur, cooled and filtered. What is the theoretical molarity of this solution if no MnO4- was consumed by impurities? M(b) What mass of As2O3 (FM 197.84) would be just sufficient to react with 25.00 mL of the KMnO4 solution in part (a)? g(c) It was found that 0.146 8 g of As2O3 required 29.98 mL of KMnO4 solution for the faint color of unreacted MnO4- to appear. In a blank titration, 0.03 mL of MnO4- was required to produce enough…
A sample known to consist of NaOH orNaHCO3, or Na2CO3 or possible compatible mixtures of these, together with inert matter. With methyl orange, a 1.10 g sample requires 31.40 mL of HCl (of which 1.00 mL ≈ 0.0140 g CaO). With phenolphthalein, the same weight of sample requires 13.30 mL of the acid. Calculate the percentage of inert matter in the sample.
A scientist was tasked to extract Fe from an aqueous suspension that contains 106 g of Fe2O3. The following steps detail the transformation of Fe2O3 (aq) to elemental iron: I. Enough sulfur trioxide gas was bubbled to Fe2O3 aqueous suspension to completely yield ferric sulfate. II. Then, 5.00 M nitric acid was added to ferric sulfate yielding an aqueous solution of ferric nitrate. III. Excess magnesium powder was added to the aqueous solution of ferric nitrate precipitating the solid iron ----- a. Write the balanced chemical reaction and the type of chemical reaction for [I], [II], [III]. Do not forget to indicate the states of the reactants and products (s, l, g).(CHOICES: COMBINATION, SINGLE DISPLACEMENT, DOUBLE DISPLACEMENT) b. What is the final mass of iron? Express final answers in 3 significant figures. c. High-concentration HCl is supposed to be added at the last part of the procedure. Briefly state its purpose.
Give the summary of reaction and rationalization of each samples.
1,5419 g of magnetite (Fe3O4) ore; Fe+2 and Fe + 3 in concentrated HCL to form a mixtureit's unraveling. Adding HNO3 to all Fe +2s Fe +3 e and Fe+3 s NH, addingwith Fe(OH)3, precipitating into. Sediment in the form of Fe3O4 after necessary operationsand 0.8525 g. Calculate the percentage of Fe3O4 in the sample.
If the molar solubility of Tl2S at 25 oC is 5.31e-08 mol/L, what is the Ksp at this temperature?Ksp = (b) It is found that 9.14e-08 g of Sc(OH)3 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Sc(OH)3.Ksp = (c) The Ksp of Cu3(PO4)2 at 25 oC is 1.40e-37. What is the molar solubility of Cu3(PO4)2?solubility = mol/L
Mass of KxFe(C2O4)y · zH2O : 5.60 g Mass of sample : 0.155 g Mass of FeCl3 used in preparation : 1.60 g Molarity of standard NaOH used : 0.100 V1, volume of standard NaOH required for first equivalence point : 9.000 mL V2, volume of standard NaOH required for second equivalence point : 15.90 mL Calculate the mass of iron in the sample :