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Questions tagged [electrochemistry]

Electrochemistry is the branch of physical chemistry that studies the relationship between electricity, as a measurable and quantitative phenomenon, and identifiable chemical change, with either electricity considered an outcome of a particular chemical change or vice versa. These reactions involve electric charges moving between electrodes and an electrolyte (or ionic species in a solution).

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35 views

What power density could a cell phone battery achieve, and how?

Current cell phones have batteries reaching about 3500mAh capacity, and I believe Lithium-Ion technology is rated at around 100Wh/kg (?) Is there a theoretical limit to how much power could be stored ...
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Collision Frequency in Liquids

I’m trying to quantify the current produced due to electrolysis of an electrolytic solution. What physical model can I use to determine the mean velocity of each ion species in my solution, taking ...
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What defines a material is an anode or a cathode?

How to know if a material is an anode or cathode? and if i connect an anode and a cathode will it be a diode? Like the pensil razor diode, if it worked not because of that, how does it work?
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Can 2 atoms of oxygen be transformed into $H_2O$ using electicity? [closed]

I am writing a novel in which a scientist is required to design a self sufficient moon base and was hoping to use this idea and whilst I have created a model where this is possible I would like to ...
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Velocity of particles in electrolysis

In an electrolysis (H20) water is split up and the protons start to move towards the anode. So one would be able to calculate the acceleration of the proton from the electric field in that area. ...
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What is the interaction between dissolved ions of opposite valence in a solution at rest?

NaCl is dissolved in water. Ions sodium and chloride are sufficiently free from each other so that they may occupy different regions of the solution after an active transport process through a ...
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2answers
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In the Volta potential or Nernst potential equations, where does the logarithm come from?

In both Volta potential and Nernst potential equations, besides some constants, temperature and valence parameters, the potential is a function of the logarithm of the ratio of two densities (or ...
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17 views

$H_2O$ dissociation by ionization in a discharge tube

As a casual amateur scientist, I wonder if it is efficient to electrolyse water in a discharge tube. I imagine that there would be 4 electrodes arranged perpendicularly. the first set of electrodes ...
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1answer
18 views

On direction of electric field in a battery

I know that the electric field points from positive to negative potential in a circuit but it is opposite inside a battery for the purpose of continuity of electron flow and electric field....but why ...
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7 views

Calculate for a Shell charge for the Interatomic Potential (aka Force Field)

I am trying to calculate shell charge of an atom in order to get spring constant for the IP calculation. I used the DFT method to calculate the dipole moment of an atom and polarisability of the atom ...
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28 views

Is equilibrium potential relative?

If you have a half cell reaction, let's say: $Zn$ electrode and ($SO_4^{2-}$ and $Zn^{2+}$) solution The solution will get more and more postive and the electrode more and more negative until $\...
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Difference between Capacitor and a battery [duplicate]

Capacitor stores electric charge and battery also stores electric charge. SO whats the difference between them?
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9 views

Charging mist particles

I've used an aquarium mist maker to make mist of water and the mist comes out through a pipe (PVC) of ~ 4cm diameter and ~ 12cm length, I want to charge those mist particles using induction technique. ...
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18 views

Field inside a battery

Suppose Beaker A contains Zn rod submerged in zinc sulphate solution.At the electrode/electrolyte interface ,since the force felt by the solvent molecules and ions are anisotropic because of the ...
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1answer
68 views

Is Ohm's law valid for water?

I have $E$ (electric field intensity) in water. I want to find $J$ (current density). I don’t know if Ohm's law ($J=\sigma E$) is valid for water. If it is not valid, how do I may find out $J$?
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33 views

How cell drives electrons to flow in a metal wire?

This was my approach using some facts I'd known- At cathode and anode of a cell reactions take place making positive terminal positively charged and negative terminal negatively charged I.e. there are ...
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Concentric cylinder cell constant

For a concentric cylinder cell (with liquid dielectric), mathematically the equation for the cell constant will always yield a lower value than for the parallel plate case for the same volume of fluid....
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How to calculate the chemical potential for a 2D lattice gas with excluded volume?

The chemical potential of a 2D lattice gas is given by $\mu = k_bTln(\frac{c}{(1-c)q}) $ , where c is the concentration of particles on the lattice, T is the temperature, and $k_b $ is the ...
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2answers
60 views

Kinetic energy and current

When a battery is connected to a resistance circuit, we know that it loses energy because heat is emitted as a result of the collisions between the electrons and stuff, but my question is, is the ...
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1answer
41 views

Relationship between concentration and resistance of aqueous solutions

I'm a senior physics/chemistry student working on a practical assignment where I am trying to identify the resistance of CuSO4 in solution (distilled water). I have recorded my data and determined it ...
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1answer
49 views

Assumptions for Nernst Equation

While I am familiar with some of the conditions for the Nernst Equation, for example: 1) "The membrane is only permeable to one ion even if there are several other ions in the system" there is an ...
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1answer
61 views

How do electrons gain energy in a cell?

When electrons reach the positive terminal, how does the cell do work on them? I’ve read in a book that states voltage is literally the push that the cell exerts on electrons, which thus does work on ...
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36 views

Resistivity of dielectric liquids

I was wondering if anyone here knows how the resistivity values of highly resistive dielectric liquids have been determined since the best commercial conductivity sensor I can find online only ...
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1answer
151 views

Nernst Equation and Energy

I have a question regarding the Nernst equation and energy in a system. I know this is also a chemistry question, but I was interested in the thermodynamics (the energy of a system), so I decided to ...
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27 views

Explain how chemical bond energy is ultimately converted to electrical energy

I can understand how a cell develops emf, why the electron flows between the battery terminals. I do not understand, How the chemical bond energy is transformed to electrical energy? What are the ...
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1answer
41 views

Why is an electrodes standard reduction potential does not depend on amount of chemicals?

The standard reduction potential is fixed for the type of chemical reaction. Why is it so? Why is an emf of a cell or an electrode's Standard reduction potential does not depend on say, quantity of ...
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1answer
60 views

What happens when I connect the negative terminal of a power source to a metal electrode ? Do electrons flow into or out of the metal electrode?

I am basically trying to understand a concept in electrochemistry. I have a power source and am connecting the negative end of the power source to a working electrode (metal electrode). Will electrons ...
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1answer
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Question about electrochemical reaction in fuel cell

The electrochemical reaction on the anode side of a fuel cell can be expressed as hydrogen split into hydrogen protons and electrons. I'm doing some research about the electrochemical reaction in a ...
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27 views

Electronegative - Electropositive atoms can attract ions?

Well I was just wondering how a copper-zinc battery works, with electrolyte an equilibrium of water and NaOH. It says that NaOH is dissolved (I understand that) into water forming H$_4$O$_8$Na+ ions ...
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1answer
145 views

Why are(n’t) rechargeable batteries damaged by partial charging?

Originally asked in ElectricalEngineering.SE, but I was told Physics.SE might be a better place to ask. Over the years, I've come across websites and people with different opinions on the "correct" ...
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19 views

Bond Type in Orthophosphate

How can we find out the bond nature in LiBaPO4 by using charge transfer values obtained through DFT calculations?
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1answer
45 views

Charge density of sea water

If sea water contains salt ions and some H+ and OH- ions, what are the charge density of a certain volume of sea water? And is there a way to calculate?
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90 views

Electrons and wires [duplicate]

The electrons that carry the electric energy are in wires or in the battery ? battery provides a potential difference but from where electrons flow to make for example a bulb light. If they flow from ...
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2answers
66 views

From where electrons flow to make a bulb light?

Suppose we have the "basic" stuff like a battery 2 piece of wire and a bulb. Battery has a potential difference. But from where electrons flow to make the bulb light? from wire or from battery or from ...
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1answer
27 views

Faradays law of electrolysis history [closed]

what actually farday predict about electric charge,would he measured the value of that.i could not understand that how he predict about the existence of charge on atomic particles from his experiment ...
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2answers
81 views

$V = 4 volts$ but $I = 0$

Recently in my school, I tried to generate electricity from plants in a flower pot with copper and Zinc electrodes. The Potential difference in the voltmeter read 2 to 3 volts but when I connected the ...
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2answers
36 views

What is the advantage of stacking the electrocytes? Of having the stacks side by side?

Electric rays (genus Torpedo) can deliver electric shocks to stun their prey and to discourage predators. The voltage is produced by thin, wafer￾like cells called electrocytes, each of which acts as a ...
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1answer
28 views

Hydrogen oxygen fuel cells

In hydrogen - oxygen fuel cell, the electrode used is carbon electrode.Hydrogen is passed through through the anode compartment where it is oxidised. Oxygen is passed through the cathode compartment ...
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37 views

Field between 2 electrodes experiment

We were asked to conduct an experiment that is as follows: Connect 4.5V constant voltage across 2 electrodes of thin Cu wire, dipped in a tub of copper sulfate solution. A needle is connected to a ...
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1answer
76 views

How can a battery 'come back to life'?

Earlier today, one of my family drained our car's battery by accident, by leaving the lights on too long. It wouldn't start at all, so they had to walk back home from where the car was parked (a few ...
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1answer
51 views

When DC current flows through salty water, how does the current flow? How can you tune the (narowness of) the path?

Consider this very simple and well-known experiment with dirty/salty water: The light bulb turns on, and current is flowing. How can you know how this current is exactly flowing, and how the electric ...
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1answer
276 views

Factors affecting Battery Voltage

How do batteries produce a certain voltage, such as 1.5V or 9 V? From what I understand, battery EMF comes from oxidation of the anode, which releases electrons that can flow through a circuit. But ...
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1answer
39 views

Is there an equation for a solution's electrical conduction as temperature varies?

I'm looking for an equation that determines a solution's ability to conduct electricity as temperature varies, that hopefully could offer insight to a salt water experiment. I did an experiment ...
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131 views

Why oxygen bubbles are larger than hydrogen bubbles during water electrolysis?

During water electrolysis, I found the oxygen bubbles are usually larger than the hydrogen bubbles. I think the reason is because different gases have different contact angles. The contact angle of ...
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1answer
1k views

Potential difference between two electrodes in an electrochemical cell

In an electrochemical cell, let's say you have a zinc and zinc ion half-cell as well as a copper and copper ion half-cell: The zinc electrode (or anode) dissolves into zinc ions while the copper ions ...
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5answers
702 views

At an atomic level, what happens when you connect two batteries in series so that their voltages are added?

I can't for the life of me figure this out. I feel like i'm missing some crucial detail about how batteries work. Imagine two batteries connected in series, like this: ...
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21 views

By shortening the N-type side to the P-type side of a diode with a wire, how does the electric potential looks like in each point of this circuit?

To avoid misunderstanding I'll first start with the notions. The electrochemical potential (which in semiconductors refers to as the Fermi level) is the sum of the chemical potential and electrical ...
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1answer
670 views

Why should potassium serve to stabilize a welding arc?

Of the many types of electric arc welding electrodes, there are two that consist of a steel core surrounded by a coating of “High cellulose sodium” and “High cellulose potassium.” The web sites (for ...
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1answer
87 views

Why doesn't the potential difference of a battery diminish when charge flows? [closed]

I want to know, when the charges travel from higher potential to lower potential of battery through the circuit then the potential difference must diminish. As it was previously made by keeping more ...
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0answers
27 views

Why does the Anode and not the Cathode corode during eletrolysis of water into $H_2$ and $O_2$?

After experimenting with the production of Hydrogen from salt water, I kept on noticing that the Anode (-) gets coroded and not the Cathode (+). Is it perhaps that water in itself is a naturaly ...