Electrochemical Definition and 66 Threads

Electrochemistry is the branch of physical chemistry concerned with the relationship between electrical potential, as a measurable and quantitative phenomenon, and identifiable chemical change, with either electrical potential as an outcome of a particular chemical change, or vice versa. These reactions involve electrons moving between electrodes via an electronically-conducting phase (typically, but not necessarily, an external electrical circuit such as in electrolessplating), separated by an ionically-conducting and electronically insulating electrolyte (or ionic species in a solution).
When a chemical reaction is effected by a potential difference, as in electrolysis, or if electrical potential results from a chemical reaction as in a battery or fuel cell, it is called an electrochemical reaction. Unlike chemical reactions, in electrochemical reactions electrons (and necessarily resulting ions), are not transferred directly between molecules, but via the aforementioned electronically- and ionically-conducting circuits, respectively. This phenomenon is what distinguishes an electrochemical reaction from a chemical reaction.

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  1. N

    RC Charge/Discharge for Electrochemical Capacitor

    I am a student working on designing an electrochemical capacitor (an area which i have limited experience). When I charge this capacitor through an RC circuit I notice two non ideal effects. I need to adress the cause of these effects if I can ever hope to correct them. The first problem is...
  2. W

    Silver-Cadmium Electrochemical Cell

    You are given the following materials:  Silver wire  A 0.10 mol L-1 solution of cadmium nitrate  Cadmium wire  A 0.10 mol L-1 solution of silver nitrate  A salt bridge  Copper wire  Beakers and other glassware as required Draw a labelled sketch of your cell. Describe...
  3. S

    Electrochemical capacitors/ ionic dielectrics ?

    I'm reading about electrochemical capacitors here: httpCOLON//electrochemDOTcwruDOTedu/ed/encycl/art-c03-elchem-cap.htm (Website won't let me post a URL until I've made 15 posts...) Do electro chemical capacitors actually store charge indefinitely ? Or do they deplete as soon as the charging...
  4. K

    Describe an electrochemical cell

    Describe an electrochemical cell that would determine the solubility product constant at equilibrium for cupric hydroxide and calculate it. I'm totally lost on this one, any help is greatly appreciated.
  5. P

    Finding which of two metals in an electrochemical cell reduces

    For an electrochemical cell containing two metals how do I figure out which one reduces and which one oxidizes using standard reduction potentials? Thank you very much for the help.
  6. M

    How Do Power Lines Influence Underground Metal Corrosion?

    According to some technical recommendation, we must be concerned about metal under ground structures (e.g. pipe lines) corrosion in neighbor of power transmission lines. Sinusoidal high current elements can produce eddy induced currents in their surroundings .The eddy currents in electrical...
  7. Andy Resnick

    What is the volume of fluid that must flow through the semipermeable membrane?

    I think this is a simple problem to solve, but I keep getting nonsense answers. The question: two reserviors held at constant osmolarity (say 1000 mOsm/l) are connected by a semipermeable membrane. A current of 1 uA is measured across the membrane. What is the volume of fluid that must flow...
  8. V

    ELectrochemical sensing problem

    Anyone knows how to derive Fick's law of diffusion: I=Jmf Given current density applied to electrochemical sensing: I= nAve where : I=current J=flux m=number of electrons F=faraday constant v=speed of particles n=number of charge carriers/vol A= cross-sectional area...
  9. D

    Electrolytic vs. electrochemical vs. galvanic cells.

    So my question is what is the difference between these cells? This always confuses me. I know that electrolytic cells are nonspontaneous and that their cathode is negative which means that electrons are going against their gradients here. I am also aware of the fact that a galvanic cells is...
  10. L

    Questions on electrochemical cells using Zn, Cu

    The problem http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/animations/CuZncell.html After veiwing the animation found at the website above answer these questions: Is there an electron transfer between species? Which species is losing electrons Which species...
  11. L

    What are the conditions for a voltmeter reading of 0 in an electrochemical cell?

    i need help on writing redox reactions and with finding the electrode in oxidization and in reduction. oh and what are the three conditions under which the voltmeter reading will be 0 (zero)? THANKS:biggrin:
  12. M

    Which Electrode is the Cathode in an Electrochemical Cell?

    Hello everyone. I am having trouble with a question on electrochemical cells. I have to find the balanced REDOX reaction of the cell. All I am given is a diagram with the following information 1. Aluminum electrode submerged in 1 mol/L Aluminum Nitrate Al(NO3)3(aq) 2. Nickel electrode...
  13. cepheid

    Understanding Potential Difference in an Electrochemical Cell

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  14. C

    Can Adding Electricity to an Electrochemical Cell Speed Up the Reaction?

    Hello, everyone. I have a project for science fair that I would like to do, but I need verification to see if this will work like I think it will. My experiment's name is "The Effects of Electricity and Configuration on an Electrochemical Cell". It's wordy, but what can I do? Anyhow, my...
  15. C

    Electrochemical Cells Experiment will it work?

    Hello, everyone. I have a project for science fair that I would like to do, but I need verification to see if this will work like I think it will. My experiment's name is "The Effects of Electricity and Configuration on an Electrochemical Cell". It's wordy, but what can I do? Anyhow, my...
  16. A

    How Can Copper Alloys Be Purified Electrochemically?

    Hi all How to purify copper alloys electrochemically ? please describe all possible commerically feseable ways and also pls specify any commerical set ups /resource that can do the above process
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