TestOut LabSim 12.3.4

O A apclassroom.collegeboard.org CollegeBoard AP Classroom I LOW BATTERY Unit 9 Progress Check: MCQ 1m ag Your Mac will sleep soon unless plugged into a power outlet. 3 8. 10 11 12 13 14 15 16 17 18 19 21 22 A UPDATES AVAILABLE 23 1:07 AM Do you want to install the updates now? Cell Type Operating Cell Potential for Commercial Batteries, E (V) Lithium-iodine +2.80 Zinc-mercury +1.35 Table 2 Half-Reaction Standard Reduction Potential, E (V) Submit [Zn(OH),]?- + 2 e → Zn + 4 OH -1.20 Zn(OH), + 2 e → Zn + 2 OH HgO + H2O + 2 e- Hg + 2OH -1.25 +0.10 O2 + 2 H,O + 4 e- → 4 OH +0.40 Pacemakers are electronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1 provides the operating cell potential, E, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells. During the initial cell operation, each reaction is…

The concentration of H2S in wastewater samples was determined by coulometric titration using Kl as mediator and I3 as "titrant". standard concentration Peak area (a.u) (ppm) 50 8354 100 16925 150 25218 200 33584 250 42002 A 50 ml wastewater sample was placed in a coulometric cell, added with excess Kl and starch indicator. Electrolysis was carried out at a constant current of 84.6 mA for 386 s to reach the end point of the titration. What is the concentration of H2S in the sample (in ppm)?

Which expression(s) are incorrectly defined? I- Ohmic potential is the voltage that overcomes its electrical resistance in an electrochemical cell while current is flowing. II- Concentration polarization occurs when the concentrations of reactants or products on the electrode surface are greater than that in the whole solution. III- Overvoltage is only the voltage required to overcome the activation energy of the reaction at the cathode. cathode only. IV- E = Ekatode - Eanode - IR - overvoltage - concentration polarization A.II and IVB. I and IIC. I, II and IIID. II, III and IV

_engine.html?ClassID=1203559343 Drie. Calculate the Gibbs Free Energy for the following cell. Mg2+ + Pb → Mg + Pb2+ E° (V) Mg2+ + 2e Mg - 2.37 Half-Reaction Pb2+ + 2e → Pb- 0.13 AG° = [ ? ] kJ %3D Enter either a + or - sign AND the magnitude in the answer. Free Energy (kJ) Enter

10.a. What is the capacity of a battery that was discharged at 75 A for 5.95 hr before reaching the cutoffvoltage?A. 450.75 AhB. 446.25 AhC. 445.50 AhD. 452.25 Ah10.b. If the weight of a pint of water is 473 g (grams) and the weight of a pint of sulfuric acid is 591 g, whatis the specific gravity of the sulfuric acid?A. 1.262B. 1.276C. 1.249D. 0.800

An antique automobile bumper is to be chrome plated. The bumper, which is dipped into an acidic Cr2072- solution, serves as a cathode of an electrolytic cell. The atomic mass of Cr is 52.00 g/mol. How much electrical energy in kWh is needed to deposit 193 g of Cr(s) onto the bumper using a 4.9 V as voltage source? Show your answers in two decimal places. Do NOT include units in your final answer.

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Please Help!! Part A: Electrochemical Cell Mass Data for Electochemical Cell   Copper Zinc Initial mass of strip (g) 2.421   2.436   Final mass of strip (g) 2.602   2.250   Measured Ecell (V)= 1.02 Part B: Electroplating Mass Data for Electoplating   Mass (g) Initial 0.930   After first plating 1.083   After second plating 1.238   After third plating 1.377       Part A: Electrochemical Cell   Table view     List view Mass Calculations for Electochemical Cell   Copper Zinc Initial mass of strip (g) 2.421   2.436   Final mass of strip (g) 2.602   2.250   Mass gained(+) or lost(−) (g)   0.18 -0.19   what is Computed Ecell (V)?   what is Computed ΔG (kJ/mol)?   Mass Calculations for Electroplating (fill in chart)   First Second Third Final mass of paper clip (g) 1.083   1.238   1.377   Initial mass of paper clip (g) 0.930   1.083   1.238…