Recent questions without an upvoted answer

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A student needs to analyze an unknown sample to determine the percent composition of three compounds present in it. The student conducts a combustion reaction to determine the percent of carbon and hydrogen in the sample. The remaining residue is then dissolved in water and the solution is titrated with a standardized silver nitrate solution to determine the chloride ion concentration in the sample. Calculate the percent composition of each compound in the unknown sample using mass balance calculations.

asked Jan 22 in Analytical Chemistry by ErmelindaSey (1.8k points)

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1 answer 106 views

A student mixed 25.0 grams of sodium hydroxide with excess hydrochloric acid. If the theoretical yield of sodium chloride is 34.0 grams, what is the percent yield of the reaction?

asked Jan 22 in Chemical reactions by JonasQuj2910 (2.1k points)

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1 answer 101 views

A student mixed 10 grams of iron and 15 grams of oxygen to produce iron oxide. What is the limiting reactant and what is the mass of the iron oxide produced? (Assume all reactions are complete)

asked Jan 22 in Chemical reactions by BradCoz53277 (1.9k points)

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1 answer 103 views

A student mixed 0.1 M solution of NH3 and 0.1 M solution of NH4Cl to form a buffer solution of NH3/NH4+. If the initial pH of the solution is 9.25, what will be the final pH of the solution when 0.01 moles of HCl is added? (Assume the volume of the solution is constant).

asked Jan 22 in Chemical equilibrium by HoraceT7712 (2.0k points)

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1 answer 109 views

A student measures the current in a galvanic cell with a standard potential of 1.10 V, using a Zinc electrode and a Copper electrode. The student recorded the current as 0.50 A. What is the rate of the electrochemical reaction occurring in the cell?

asked Jan 22 in ElectroChemistry by LawrenceMcGr (1.8k points)

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1 answer 138 views

A student is trying to synthesize a compound in the lab. The theoretical yield of the compound is 15 g, but due to some errors during the experiment, the student was only able to obtain 10 g in the end. Calculate the percent yield of the experiment.

asked Jan 22 in Chemical reactions by RachelMcCann (2.2k points)

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1 answer 133 views

A student is trying to determine the heat capacity of a substance at constant pressure, given its thermodynamic properties. The substance is in the gas phase and is confined to a container at a specific temperature and pressure. What is the mathematical expression for the heat capacity of the substance in terms of its thermodynamic properties, and what is the numerical value of the heat capacity at the given temperature and pressure? How would the heat capacity change if the temperature or pressure were to be changed?

asked Jan 22 in Physical Chemistry by WilbertNorri (2.0k points)

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1 answer 124 views

A student is studying the overpotential in an electrochemical reaction in a laboratory experiment. The student measures a current of 2.1 A at an electrode potential of -0.6 V, and 1.95 A at -0.5 V. What is the overpotential of the reaction?

asked Jan 22 in ElectroChemistry by GlenCaringto (2.1k points)

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1 answer 111 views

A student is studying the kinetics of a reaction between hydrogen and iodine gases. They measure the initial rate of the reaction to be 0.025 mol L^-1 s^-1 at a particular temperature. They want to calculate the rate constant for this reaction using this information. What is the rate constant of this reaction at this temperature?

asked Jan 22 in Chemical kinetics by LeannaCremea (1.6k points)

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1 answer 118 views

A student is studying the electrochemical reaction of the metal copper in acidic solution. They measure the current density at different applied potentials and obtain the following data:Potential vs. SHE (V) | Current Density (mA/cm²)---|---0.0 | 0.00.1 | 0.50.2 | 2.00.3 | 5.00.4 | 11.0Using this data, calculate the anodic and cathodic Tafel slopes, and determine the rate constant for the electrochemical reaction.

asked Jan 22 in ElectroChemistry by VictorinaWoz (1.9k points)

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1 answer 92 views

A student is studying the electrochemical behavior of a certain metal ion in a solution of varying pH values. They have measured the anodic and cathodic Tafel slopes for the electrode reaction at each pH. The anodic Tafel slope values range from 60 mV/decade to 90 mV/decade, and the corresponding cathodic Tafel slope values range from 50 mV/decade to 70 mV/decade. Is this metal ion undergoing a one-electron or a two-electron transfer reaction? Justify your answer.

asked Jan 22 in ElectroChemistry by AugustusQsj (2.5k points)

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1 answer 143 views

A student is studying a chemical reaction that goes to completion in a beaker placed on a heated surface at a constant temperature. After the reaction has come to completion, the student removes the beaker from the heated surface and allows it to cool. Using the principles of non-equilibrium thermodynamics and irreversible processes, how can the student calculate the amount of heat that was transferred during the process? Specifically, what factors must be taken into account in order to accurately calculate the heat transfer?

asked Jan 22 in Physical Chemistry by LinetteWaldo (1.6k points)

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1 answer 96 views

A student is given the electrochemical cell reaction:MnO4-(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)Calculate the standard potential (in volts) of the cell at 25°C given that the standard reduction potential of MnO4-(aq)/Mn2+(aq) couple and the standard reduction potential of the H+(aq)/H2(g) couple are +1.51 V and 0.00 V, respectively. The concentration of MnO4-(aq) is 0.010 M and that of H+(aq) is 1.00 M.

asked Jan 22 in ElectroChemistry by AlfonsoJanze (1.9k points)

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1 answer 107 views

A student is given a sample of an inorganic compound that contains only carbon and hydrogen. The sample has a mass of 0.500 g and, upon combustion, produces 1.442 g of carbon dioxide and 0.589 g of water. Determine the empirical formula of the compound.

asked Jan 22 in Inorganic Chemistry by CorneliusU11 (1.7k points)

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1 answer 84 views

A student is given a mixture of two unknown substances, one organic and one inorganic, and is asked to identify these compounds using mass spectrometry. Can you provide a step-by-step procedure using mass spectrometry to identify the two unknown compounds?

asked Jan 22 in Analytical Chemistry by RichieRedric (1.9k points)

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1 answer 68 views

A student is given a lead-acid battery, which has a standard reduction potential of -0.356 V. The battery is undergoing a reaction where Pb(s) + SO4^2-(aq) -> PbSO4(s) + 2e^-. If the concentration of PbSO4 in the anode compartment is 1.15 M and the concentration of PbSO4 in the cathode compartment is 0.55 M, what is the power output of the battery, assuming it has a current of 1.25 A?

asked Jan 22 in ElectroChemistry by SergioCrews1 (1.9k points)

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1 answer 112 views

A student is given a galvanic cell that has a copper electrode and a silver electrode. The concentration of copper ions in the solution surrounding the copper electrode is 1.0 M, and the silver electrode is submerged in a solution of AgNO3 with a concentration of 0.1 M. The cell temperature is 25°C. Calculate the resistance of the electrochemical cell given that the cell is at equilibrium and the cell potential is measured to be 0.46 volts.

asked Jan 22 in ElectroChemistry by Lowell36338 (1.9k points)

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1 answer 105 views

A student is given a galvanic cell consisting of a zinc electrode and a copper electrode. If the concentration of zinc ions in the zinc half-cell is 0.1 M and the concentration of copper ions in the copper half-cell is 1.0 M, what is the corrosion potential of the zinc electrode at standard conditions? (Assume that the standard electrode potential of copper is +0.34 V and that of zinc is -0.76 V.)

asked Jan 22 in ElectroChemistry by AdeleStrothe (2.1k points)

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1 answer 68 views

A student is given a concentration of 0.1 M of CuSO4 and 0.2 M of AgNO3, and is asked to calculate the total resistance of an electrochemical cell with electrodes made of these two solutions separated by a salt bridge. The standard reduction potentials for Cu and Ag are +0.34 V and +0.80 V, respectively. Calculate the total resistance of the cell at 25°C assuming that the cell has a thickness of 1 cm and a cross-sectional area of 10 cm².

asked Jan 22 in ElectroChemistry by Rogelio58821 (1.7k points)

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1 answer 45 views

A student is designing an electrochemical cell using zinc and copper electrodes. The student wants to know the current density (in A/cm²) when the cell operates at a voltage of 1.5 V and a temperature of 25°C. The area of the zinc electrode is 10 cm², and the area of the copper electrode is 5 cm². Assuming a 2:1 ratio for the transfer of electrons between the two electrodes, calculate the current density in the cell.

asked Jan 22 in ElectroChemistry by ZKLBarbra368 (2.3k points)

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