All Questions
Tagged with electrons electrochemistry
76
questions
-3
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1
answer
79
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Does the cathode always attain a positive charge or is it just a convention?
Suppose I have a galvanic cell composed of two half cells, one containing Zinc electrode dipped in an electrolytic solution (say of ZnSO4) while the another one having Lithium electrode dipped in ...
0
votes
0
answers
24
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Degradation via electrolysis and electrode surface area
What is the relationship between electrode surface area and processes such as electrolysis/electrode polarization?
Let's say for example I want a fixed electric field between two electrodes in a ...
- 1
5
votes
1
answer
81
views
Correct Interpretation of Apparent Charge Transfer Coefficients
Good day guys,
I was looking over some $i$ vs $\eta $ for a redox reaction over a copper cathode, the cell has $\ce{LiBf4}$ in THF as the electrolyte. The main reaction taking place is:
$$\ce{N2 + 6 ...
- 267
0
votes
2
answers
85
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Fundamental understanding of electrode potentials
The electrical double layer, is commonly used to describe the origins of electric potentials that is fundamental to electrochemistry. This model is quite outdated from my understanding, but it is ...
- 95
0
votes
2
answers
39
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Electrolysis to refine metals
Why does the cathode get bigger and the anode smaller when we use copper electrodes for the electrolysis of Copper Sulphate? Why does the anode not receive electrons from the anions (e.g Sulphate and ...
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13
votes
3
answers
2k
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Do electrons really hang around the electrode while ions go take a swim?
This answer to this post addresses "what happens if you dip a single zinc electrode into some electrolyte solution." It explains that
However, though the zinc ion can diffuse through the ...
- 22.5k
-3
votes
1
answer
68
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Aqueous electrons in electrochemical cells [closed]
In the context of a zinc-copper electrochemical cell, zinc atoms at the anode are oxidized, releasing electrons and forming zinc ions that dissolve into the solution ($\ce{Zn(s) -> Zn^{2+}(aq) + 2e-...
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2
votes
1
answer
96
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Do solvated electrons short circuit the electrolysis of liquid ammonia
If attempting the electrolysis of liquid ammonia using NaNH2 as an electrolyte. It is understood that Na+ will form solvated electrons. I understand that these solvated electrons can dramatically ...
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votes
2
answers
123
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How do electrons travel through a fuel cell or flow battery with multiple cells?
I understand that if you have a fuel cell or flow battery with a single cell that electrons will go from the electrode and through an external circuit across the load which the fuel cell / flow ...
-5
votes
1
answer
90
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Is the given figure correct? Does the electron really flow out as depicted by the arrow? [closed]
Someone up here questioned about the figure and that the arrow is pointless and doesnt make sense? Or is it?
-1
votes
1
answer
143
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Why does lead gains electrons in the cathode? [closed]
In lead(II) bromide electrolysis, lead is attracted to the cathode and gains electrons. Why does it gain electrons when losing them would be easier since its charge is +2 meaning it would need to lose ...
- 1
22
votes
3
answers
2k
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True or false: "A used AA battery contains fewer moles of electrons than a new AA battery."
I recently took a Gen. Chem. 2 exam that contained this question. I answered false, but my professor said the answer is true. My reasoning was that any electrons that leave the anode end up at the ...
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-1
votes
1
answer
134
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Can use lead(II) oxide instead of lead(IV) oxide in car battery?
Question: If the discharge input equation $\ce{PbO2}$ is replaced by $\ce{PbO}$, will the battery still work? I think the product will not be water anymore but hydrogen gas. I am asking this question ...
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0
votes
1
answer
274
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How does high voltage on the electrodes ionize a gas?
I was studying cathode ray experiment and there the electrons were obtained by ionisation of the gas inthe tube by the high voltage on the electrodes. So how does this happen?
- 17
1
vote
1
answer
72
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Thickness of proton exchange membrane (Nafion)?
I am looking into using a proton exchange membrane for a bio-energy cell experiment. Previous scholars have been using Nafion as a PEM to place between the anode and cathode (air-cathode). the ...
3
votes
3
answers
575
views
Does a change in oxidation number in a redox reaction mean that an actual electron transfer occured?
Oxidation numbers are fictitious charges that pretend the entire molecule is an ion i.e. it artificially localizes electrons onto atoms within a single molecule. In a redox reaction, we find that an ...
- 309
3
votes
2
answers
807
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What if kinetic energy of ejected electron = 0
When hf ≥ work function, Then the electron still comes out. So, if I say kinetic energy of ejected electron = 0, it should still come out. Right ?
Then, how does the electron even move out or gets ...
- 421
0
votes
1
answer
387
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Schrodinger's Equation and Wave Function
So I understand that there exists the shrodinger's equation, which on solving,gives the wave function of an electron. The wave function as I understand, gives all possible information about an ...
-4
votes
1
answer
684
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How does a body lose electrons? [closed]
If there is a Na and cl in solid form , There will be atoms inside of them.How do they lose electrons ?.We know solid body has a structure and covering.Just like you can touch is the covering of table ...
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votes
2
answers
92
views
How does a battery create a potential differece (voltage)? [closed]
I'm 15 and recently started electronics and I just had a question about batteries.
(I've been told by people on physics stack exchange to come here to have my question answered).
From what I ...
- 111
0
votes
1
answer
783
views
How does the charge imbalance affect the cell reaction when there is no salt bridge in a galvanic cell?
As mentioned in the answers to this question Why is it important to use a salt bridge in a voltaic cell? Can a wire be used? a salt bridge is used to keep the two half cells neutral. i understand how ...
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-2
votes
1
answer
104
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Where do the electrons in lead–acid battery come from? [closed]
$$
\begin{align}
\ce{PbO2 + H2SO4 &-> PbSO4 + H2O + O} &\quad &\text{(anode)}\\
\ce{Pb + H2SO4 &-> PbSO4 + H2} &\quad &\text{(cathode)}
\end{align}
$$
The cathode’s $\ce{...
1
vote
0
answers
91
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Equilibrium cell potential question
In an attempt to wrap my head around the basics of electrochemistry I'm working my way through Wesley R. Browne's 'Electrochemistry' primer.
With regards to the equilibrium potential of an ...
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2
votes
0
answers
136
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Is my understanding of cyclic voltammetry correct? [closed]
So recently I've been roped into doing some CV and I'm trying to wrap my head around the fundamentals of the science behind it (and electrochemistry more generally! Bare in mind I'm very much not an ...
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-1
votes
1
answer
185
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Predicting directions of redox reactions [closed]
Hello!
In this textbook example question, how come the chlorine reaction, which has the greatest reducing power will not react? If it has the greatest E of 1.36 V that means it has most reducing ...
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votes
1
answer
137
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How does Fe2+ become Fe in sacrificial protection? [closed]
I've searched low and high on the internet, but nothing to help me.
I know that zinc is oxidised in preference to iron, and that it "donates" those two electrons to iron.
$$\ce{Zn -> Zn^2+ + 2e-}$$...
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0
votes
1
answer
3k
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Why oxidation potential of an electrode equals negative reduction potential of the same electrode?
My textbook states that:
$E^\circ_\mathrm{ox} = -E^\circ_\mathrm{red}$ (of same electrode)
I know that electrons flow from anode half cell (oxidation) to cathode half cell (reduction).
But if $E^\...
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7
votes
4
answers
3k
views
How can a neutral atom attract electrons when it's supposed to have zero charge?
A neutral atom is an atom with an equal number of protons and electrons
We know the force of attraction between the proton and electron is equal
and assuming that:
one proton's positive charge ...
- 639
0
votes
0
answers
152
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questions about half cell of Daniell cell
My questions are as follows:
For the Daniell cell, we assume that ZnSO4 and CuSO4 are 1M aqueous solutions. What if we use pure molten ZnSO4 and CuSO4 instead?
Assume that we prepare an isolated half-...
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-1
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1
answer
95
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Why electrons move to Cu in galvanic cells?
I'm student who learning about chemistry, and I got problem about understanding why electorns move to Cu in galvanic cells.
Let's think the reason for electrons going to Cu is that the standard ...
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0
votes
0
answers
33
views
What Ion gets reduced in this aqueous electrolysis?
In an electrolysis of tin(II) iodide ($\ce{SnI2}$) with led cathode and nickel anode, why is it that the tin ion gets reduced and not the nickel ion?
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-1
votes
1
answer
151
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What do electrons usually do when lead acid battery is idle?
Lead acid batteries operation are governed by Redox reactions for charging and discharging. But, what do electrons usually do when lead acid battery is idle? And why?
Assumptions:
Say more ...
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votes
1
answer
5k
views
When surface area of electrodes is increased, why does the current in the galvanic cell increase?
I did a lab in galvanic cells where I changed the surface area. As a result, the current increased, but I don't really understand why. I guessed it was because more are means that more ions from the ...
12
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6
answers
592
views
Is there any electronic component to water conductivity?
Answers to Decrease in temperature of a aqueous salt solution decreases conductivity indicate that the electrical conductivity of salt solutions arises from the mobility of ionic species and therefore ...
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-1
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1
answer
663
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Why electrons are attracted by cathode in Voltaic/Galvanic cell
I studied that in the above setup electrons are attracted by Cu because of their reduction potential but they don't involve in reaction because of the d-bands of the electronic structure so Hydrogen ...
3
votes
0
answers
316
views
Why do electrons not flow through the electrolyte? [duplicate]
Why do the electrons not flow through the electrolyte instead of the external circuit in a electrolytic cell connected to an external circuit? I mean, if an electrolyte is a conductor why would the ...
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3
votes
1
answer
189
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Are my intuitions about how batteries work right? [closed]
Being really fascinated by how electricity actually works, I started studying batteries.
I initilally understimated the complexity of this apparently-simple objects, and thorugh studies and researches ...
8
votes
0
answers
392
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What exactly is an "electron-sponge"?
What exactly an "electron-sponge" [behavior/action/property/system] nickname is, and what makes a material an "electron-sponge" (preferably, quantitatively)?
From what I found, it's typically a ...
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2
votes
0
answers
70
views
Do some electrons transfer if I connect with a conductor 2 solid pieces of 2 different elements with different electronegativity? [closed]
Making some researches to answer my last post, I found this article.
It explains that when a piece of zinc and a piece of copper are connected with a conductor, since copper is more elctronegative ...
2
votes
2
answers
2k
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Why does copper form bubbles in vinegar in this situation?
I watched this video in which the host tries to show the principles behind the voltaic pile.
The host first immersed zinc in vinegar and bubbles are observed forming around zinc. I've learned that ...
-2
votes
1
answer
313
views
If two atoms "fight over" one electron, who will win? [closed]
If two atoms of different elements are both missing exactly one electron in their valence shell so that they have a charge of +1
and we place an electron between them, exactly in the middle.
Which ...
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-1
votes
1
answer
2k
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Why is the standard reduction potential of an anode negative in a galvanic cell?
It makes not intuitive sense to me why something can have a negative voltage , I understand the concept of voltage drop , but voltage is not being dropped in the anode so why would it be negative ?
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21
votes
2
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644
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Some materials emit more photoelectrons than others - why?
I've been experimenting with some materials by changing the wavelength of the incident light on the material and detecting photoelectrons, like in the diagram below:
I might get a response that looks ...
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3
answers
3k
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Number of electrons transferred & Gibbs free energy
To determine the number of electrons transferred for the following reaction:
$$\ce{CH3OH + \frac{3}{2} O2 -> CO2 + 2 H2O}$$
I found the half reactions to be:
$$\text{Anode: } \ce{CH3OH + H2O -&...
1
vote
0
answers
63
views
How do I increase the amount of electrons transferred in a battery?
I made a simple battery with $\ce{Al}$ as anode electrode with $\pu{0.7 M}$ aluminum sulfate electrolyte. Platinum is my cathode electrode with $\pu{2 x 10^-4 M}$ $\ce{KOH}$ solution. I am generating $...
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15
votes
7
answers
111k
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Which is anode and which is cathode?
A maybe (hopefully) simple question about the denotations of "anode" and "cathode". The below image is a schematic of a polymer solar cell (Source (WBM)). (The figure text is quoted as well for the ...
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0
votes
0
answers
306
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Reduction of potassium ion and hydrogen ion
I am studying a galvanic cell, and the cathode uses potassium hydroxide as its electrolyte. I am getting confused as to what gets reduced when electrons come from the anode.
I believe it would be the ...
- 864
0
votes
1
answer
54
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Oxidation Half Reaction Chemistry
I was always confused as to how electrons where donated from the anode in a galvanic cell. But after doing research, I found that there are four fundamental ways as to where electrons in anodic ...
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3
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7k
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What happens when we connect a external emf (having emf greater than that of emf of a galvanic cell) to a galvanic cell?
I read a statement given in the book and I did not understand it
"If any external battery is connected whose emf is more than the emf of galvanic cell ,then it will act as Electrolytic cell"
Also ...
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9
votes
1
answer
283
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Fundamentals of Li-ion Functionality
I would like to have an in-depth understanding of Li-ion batteries functionality, at atomic level. Can anyone help me to understand it? I have included some known background to support my questions.
...
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