Physics

Solution Library


Differential and Integrated Capacitance of the Pt/solution Inter phase

Question When a power supply brings an electrode in an ionic solution to a potential versus a reference electrode, then the electrode surface and adjacent layer of solution store charge like two plates of a parallel plate capacitor. The inner potential drop between electrode surface and adjacent la ... Read More

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An Ideally Non- Polarizable Electrode-Multiple Choice Question 

Question An ideally non- polarizable electrode  Exchange electrons with species in solution Does not exchange electrons with species in solution Changes potential as electrodes pass through the non- polarizable electrode Does not change potential as electrons pass through the non-polariz ... Read More

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A Reference Electrode-Multiple Choice Question

Question A reference electrode is a good letter of recommendation is an ideally polarizable electrode has a fixed inner potential difference between a particular electrode and a particular electrolyte solution is an ideally non- polarizable electrode b and c c and d none of the above &n ... Read More

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Inner Potential-Multiple Choice Question

Question The inner potential is the electric potential within a phase cannot be measured is a measurable quantity a and b a nd c none of the above     ... Read More

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Calculation of Electrical Power Density Produced by the Fuel Cell-Multiple Choice Question

Question The fuel cell is operating with a current density, j of 0.3A/cm3,  and a cell voltage, Vcell of 0.6 volt, as it uses hydrogen as the fuel and oxygen as the oxidant. What is the electrical power density (in Watts/cm2) produced by the fuel cell? 6 Watt/cm2 3 Watt/cm2 18 Watt/cm2 0 ... Read More

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Calculation of Electrical Efficiency Produced by the Fuel Cell-Multiple Choice Question

Question A fuel cell converts the chemical energy in fuel and oxidant to electric energy (as shown in the figure to the right). The reversible potential for the hydrogen electrode, E0H2, is 0 volt versus the reversible hydrogen electrode (RHE). The reversible potential for the oxygen electrode, E0O ... Read More

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Calculation of Current in the Cell is due to Electronic Conduction in Doped AgBr-Multiple Choice Question

Question Doped AgBr is a solid that conducts silver ion (like a so called, “metal”). Find the electronic (as opposed to ionic) contribution of electrical conduction for a cell consisting of doped AgBr between two Ag electrodes (see figure to right). Each electrode in the cell initially ... Read More

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Sodium ion and Sodium Mercury Amalgam Reaction-Multiple Choice Question 

Question Sodium ion, Na+, in solution can be reversible reduced at a mercury electrode to sodium mercury amalgam, Na (Hg), as is summarized in the reaction below The effect of electrode potential on the direction of this reaction is graphically represented as    Match each figure lab ... Read More

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Volume vs. Pressure State Diagram for O2 using the Peng-Robinson Equation

Question Produce a Volume versus Pressure state diagram for O2 using the Peng-Robinson equation of state. Explain your calculation method thoroughly. Summary This question belongs to thermodynamics and discusses about Volume versus Pressure state diagram for O2 using the Peng-Robinson equation of ... Read More

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Calculation of Compositions of the Equilibrium Phases in a Separator

Question A liquid mixture of the hydrocarbons methane (1) ethane (2) and propane (3) is flashed through a throttle valve into a separator at 10oC and 13.8 bars. What fraction of the feed stream leaves the separator as a liquid and what are the compositions of the equilibrium phases? The overall fee ... Read More

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Verification of a Equation using R-W Equation of State

Question The R-W equation of state is given as where P is the pressure, T is the temperature, R is the universal gas constant, Vm is the molar volume, and a and b are constants given as follows: with Pc and Tc the critical pressure and temperature, respectively. Verify the following equation: ... Read More

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Construction of Velocity Diagram and Determination of Nature of Dashed Boundary

Question For each of these flat Earth examples, make a velocity diagram and determine the nature of the dashed boundary. Show relative motion at that boundary with its direction and magnitude in mm/yr. Double headed arrows denote a transform boundary whose sense of displacement is for you to determ ... Read More

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