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).

Filter by
Sorted by
Tagged with
0 votes
0 answers
16 views

Electrolysis of a solution of $\rm Ni(NO_3)_2$

This is a problem given in my textbook A current of $3.7 amp$ is passed for 6 hours between inert electrodes in 0.5 litres of 2M solution of $\rm Ni(NO_3)_2$. What will be molarity of the solution ...
user avatar
  • 64
1 vote
1 answer
33 views

What causes the electric field in a Daniell Cell?

I would like to know what causes the e-field in a Daniell cell. From a chemistry point of view, I do understand that this is initiated by a redox reaction in which Gibbs free energy is decreased. The ...
user avatar
1 vote
1 answer
48 views

Why does electrolytic conductance increase with dilution?

We are only talking about strong electrolytes. According to my book, conductance increases slightly due to dilution. Explanation given by my book: On the one hand, in a dilute solution, the number of ...
user avatar
0 votes
1 answer
13 views

What is the cross-section area of an electrode when measuring electrolytic conductivity?

If we have two flat plates, then the area is understood easily. However, if our two electrodes are like this: then will we take the area of $S_1$ or $S_2$?
user avatar
0 votes
1 answer
79 views

Is the positive terminal of a Daniell cell positively charged electrostatically?

Suppose, the circuit is open. I understood from @Dale's answer that the negative terminal of the battery is indeed electrostatically negatively charged. Suppose, it can have a charge of $-0.5C$. ...
user avatar
3 votes
1 answer
51 views

What's the highest theoretical energy density in a chemical battery?

Is there a theoretical limit to how energy dense chemical batteries can be? How can one calculate them? And what stops us from reaching those limits?
user avatar
  • 55
-1 votes
2 answers
30 views

If a battery (cell) was elongated, will it have higher voltage?

Voltage is the potential difference between the terminals of the battery,and this potential difference is created by the work that the chemicals inside the battery had done. Also, work done is ...
user avatar
-1 votes
1 answer
25 views

Battery efficiency [closed]

I have 4000 mah 4 cell and a 5000 mah 3 cell Which battery is more efficient. Higher mah or more number of cell. I am selecting batteries for rc plane
user avatar
0 votes
2 answers
56 views

How does a cell discharge their voltage?

I'm posting this question because I haven't been able to find any sources on the internet to make sense of. The statement I am working with is as follows: The terminal potential difference of a ...
user avatar
  • 157
0 votes
2 answers
77 views

Is battery a source of electrons OR a driving force?

A more elaborate question " With my previous knowledge I am aware that a wire possesses a sea of electrons ( free electrons) and the flow of those electrons is called current . The energy to flow ...
user avatar
1 vote
2 answers
57 views

Tokamak and Lithium "blankets"

I am working on planning out nuclear fusion for a fictional world, and I am wondering if two ideas are able to work together, or if they contradict each other. So Dueterium-Tritium fusion releases ...
user avatar
  • 221
1 vote
3 answers
110 views

Where do electrons flow inside a battery? What happens inside a battery?

Sorry, if this sounds silly, but I have had this doubt from a long time. Please help me, I'll forever be grateful to you. I'm a student of 10th grade. This is my doubt: What happens when electrons ...
user avatar
0 votes
0 answers
28 views

Can a PEM fuel cell be converted into a PAFC or High Temperature-PEM fuel cell?

My goal is to use methane to generate electricity using a fuel cell stack! The electrolyte a typical PEM fuel cell would get carbon monoxide poisoning if methane was used. I've read that Methane works ...
user avatar
0 votes
1 answer
45 views

Potential difference in circuit of dry cell [duplicate]

I referred to this question potential difference but had a few doubts as to why do electrons move in a circuit? What exactly causes them to do so? And what is the chemical reaction in the cell which ...
user avatar
1 vote
0 answers
18 views

Why does current flow in an electrolytic cell?

Many explanations of current flow in electrolytic cells will state that electrons flow from the external power source into the cell (via the cathode). But surely this current flow would stop if there ...
user avatar
3 votes
1 answer
221 views

Is the reason why a normal battery ran out of "juice" that it has reached electrostatic equilibrium between its two terminals?

If we connect a normal battery to a load circuit, its stored electric potential energy on its two terminals (+) & (-) will be consumed by work done on the load and eventually the battery is "...
user avatar
  • 3,025
1 vote
1 answer
36 views

Time-reversal in a simple current loop

In classical physics, time and velocity change sign under time-reversal while position, acceleration and force do not. An accelerating particle going to the right becomes a decelerating particle going ...
user avatar
  • 6,423
1 vote
0 answers
33 views

Does charged Li-on battery burn more than discharged one if damaged? [closed]

I am wandering if a charged Li-on battery burns more than discharged one if damaged, considering that the charged one has more energy in it. Thanks.
user avatar
0 votes
1 answer
56 views

How long does it take for a battery to begin to produce a current after it is shorted? [duplicate]

From the moment you short a battery, how long before the current BEGINS to flow. Does a virtual photon need to travel the path of the wire? I was thinking it would be the length of the wire divided by ...
user avatar
0 votes
0 answers
38 views

Electrons produced in water by ionizing radiation vs. electrons due to electrostatic charge: are they equally reactive?

It is known that one of the things generated in water or aqueous solutions by the ionizing radiations are free electrons that quickly become "hydrated" or "aqueous electrons" (see ...
user avatar
0 votes
2 answers
99 views

What are the electrons doing? Voltage of two batteries in a series

I've been trying to visualise what is going on inside the batteries when you connect, let's say two 1 and 5 V batteries, and why the voltage is added to 3 V. Several good explanations have tried to ...
user avatar
4 votes
1 answer
358 views

How batteries create voltage?

I am trying to have a more fundamental understanding of electricity and specifically what voltage is. My memory of highschool physics was that a battery has an excess of electron on one terminal, and ...
user avatar
0 votes
0 answers
44 views

Influence of the current polarity in the Hodgkin-Huxley model

Suppose I place a monopolar electrode at a certain distance from a target neuron, which can be described by an electrical circuit according to the HH model (see picture). Why is there such a ...
user avatar
2 votes
5 answers
290 views

Connect negative terminal of a battery to Earth

I have a question about what happens in following experiment: Assume we have a battery with two Galvanic half cell, eg a magnesium and a copper cell. Since copper has higher electrode potential that ...
user avatar
1 vote
1 answer
64 views

If ions are stable, then why does a battery have an expiration date?

I am talking about non-rechargable batteries. As far as I understand, ions in a battery are stable form of atoms, just having excess electrons, or lesser electrons (relative to the neutral atom). Now ...
user avatar
0 votes
0 answers
23 views

Electricity in battery through Galvanic Cell

I found out how galvanic cell works and it was very interesting to know. But when I m reading electricity and current mechanism in physics, the book says that the electrons through oxidation (Zn lose ...
user avatar
0 votes
1 answer
22 views

Direction of current detected by ammeter for ions

if the pipe contains Na+ and Cl- ions, will the ammeter have the reading as $enAV_{Na}$+$enAV_{Cl}$ or $enAV_{Na}$-$enAV_{Cl}$ (as the ions move in opposite directions?)
user avatar
  • 11
1 vote
0 answers
25 views

What is the highest possible battery reaction voltage?

For a battery cell with the overall chemical reaction $xA + R = A_xR$ (where x is the number of mols of A that reacts per mol of R), (Huggins 2008) defines the Maximum Theoretical Specific Energy (...
user avatar
0 votes
2 answers
186 views

How Does Electrical Work Change Internal Energy of the System?

I know this stack exchange may not be the most appropriate to ask this question and it is better to ask it at chemistry stack exchange. However, I got no satisfying answers there so I figured I'll ...
user avatar
0 votes
2 answers
63 views

What does a battery produce? Is it Electric Potential Difference (EPD) or Electro Motive Force (EMF)?

I have read a lot of posts about Electro Motive Force, Electric Potential Difference and their differences, but I still confused. What I know is that EMF produces a EPD and keeps it constant, then ...
user avatar
3 votes
2 answers
312 views

Why does the potential across the terminals of battery increase on moving from negative terminal to positive terminal?

I really want to know that how does battery create a potential difference across the circuit. When we cross the battery from its negative terminal to positive terminal the potential rises by the ...
user avatar
0 votes
1 answer
64 views

Why the electric field inside the battery (when connected to a circuit) opposes the electric field into the wire?

I mean yea, ok, it makes sense inside the battery to point from + to -, but what the physical meaning of being opposite to the current flow (or the E-field inside the wire) is? For the sake of ...
user avatar
  • 19
0 votes
2 answers
86 views

What's happening to the potential energy of electrons after they left battery?

friends. I am new in the electrical field so I must show my guided point of sides that related to my question before I ask it, for understanding how I think. first, let's begin with the battery, I ...
user avatar
  • 1
0 votes
1 answer
11 views

Possible to use alcali solution to discharge static electricity?

My question may contain wrong assumptions: I believe static electricity present in a workshop because of friction may be caused by electrons or negative ions I believe that it is somehow possible to ...
user avatar
1 vote
1 answer
69 views

Why does the high charge density of a proton prevent it from existing alone in a solution?

My chemistry lecture notes say that when an acid is in a solution, it can give off protons, but only when there is another molecule that can accept those protons. It is said that the reason why the ...
user avatar
  • 813
0 votes
2 answers
46 views

Discharging of a rechargeable battery

When we connect a load to a battery what is the reason of moving electron to load? Is it correct to say because in charging we forced positive ions to placed in anode, when we connect two electrodes ...
user avatar
  • 5
4 votes
1 answer
216 views

How does cold make batteries drain faster yet simultaneously they should be refrigerated to keep a charge?

I have always known via common knowledge that batteries drain quicker when it's cold. I've been told it's best to keep them in an inner pocket close to body heat when outdoors (e.g., batteries for ...
user avatar
  • 209
2 votes
1 answer
135 views

In a new unconnected battery, has a chemical reaction already occurred to cause excess electrons on anode end?

REACTION 1: When I buy a new unconnected alkaline cell, has a chemical reaction already occurred on anode end which releases electrons on anode end? REACTION 2: Also, in the same new unconnected state ...
user avatar
  • 217
1 vote
2 answers
294 views

Fundamentals: The role of Battery in a circuit

As I understood, the analogy of a charge moving through a circuit is similar to water flowing from a high altitude to a low altitude (like waterfalls). But in waterfalls there are two requirements if ...
user avatar
1 vote
2 answers
50 views

What happens when a battery discharges?

Questions I am interested in: What determines the amount of current a battery can supply? What changes when a battery discharges - voltage, max current, or both? What is the best predictor of the ...
user avatar
3 votes
2 answers
200 views

Conceptual understanding of how a battery ensures that a capacitor has the same potential difference as it?

I was wondering how exactly a battery is able to ensure that a capacitor connected to it would have the same potential difference as it. Like, thinking about a battery similarly to a capacitor, I ...
user avatar
1 vote
1 answer
64 views

Would increasing separation of terminals of a battery increase potential differnce?

If my understanding is correct, the chemical reaction in a battery is basically a conveyor belt that moves electrons from the positive to the negative terminal of the battery until the electric field ...
user avatar
2 votes
3 answers
232 views

Charging of a capacitor by battery

I know that a battery does work when it takes positive charge from one plate of capacitor and deposits it to the other plate, thereby creating equal and oppositely charged plates having electric field ...
user avatar
1 vote
2 answers
263 views

How does the electrochemical potential within a battery work at the level of basic E&M?

The explanations that I've seen for how batteries work (like this one) tend to go along these lines: One electrode "has an electrochemical potential that makes it want to give up electrons" ...
user avatar
  • 41.3k
1 vote
2 answers
78 views

Are the potentials of the electrolytes equal in Galvanic cell?

My book defines Electrode Potential for a Galvanic Cell as follows: A potential difference that develops between the electrode and the electrolyte is called Electrode Potential $$E= V_{electrode} - ...
user avatar
  • 1,407
1 vote
0 answers
41 views

Does membrane permeability affect the equilibrium reached by two different concentrations of equally charged ions?

I'm asking this question to aid understanding of the formation of membrane potential in a cell from electrochemical gradients of ions e.g. why the membrane potential is skewed towards the equilibrium ...
user avatar
0 votes
1 answer
2k views

Why does alkaline battery is more likely to damage quartz clock? [closed]

When I purchase a quartz table/wall clock, most of the time it has a sticker saying not to use alkaline battery and from this quora question. There is also mixed thought about this but in theory (I ...
user avatar
  • 326
0 votes
0 answers
24 views

Why least active metals have highest conductivity

Metals like copper, gold,silver hold the lowest spot in chemical reactivity series ie; they show more tendency to get reduced than any other metal; but in terms of electrical conductivity they hold ...
user avatar
2 votes
4 answers
985 views

In a circuit, does a battery create electrons which it 'injects' into the copper wire? [duplicate]

Are electrons created from a battery and then 'injected' into the copper wire? If no, does that mean the battery loses power because the copper wire has run out of free electrons?
user avatar
0 votes
1 answer
74 views

How would a light bulb filled with $H_2$ gas behave?

I am modifying light bulbs trying to use unique bottles and jars for the envelope. I was thinking I could prevent the filament from oxidizing by removing all $O_2$ before sealing it, and an easy way ...
user avatar

1
2 3 4 5