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
2answers
35 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 ...
0
votes
1answer
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 ...
1
vote
1answer
32 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 ...
0
votes
2answers
33 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 ...
4
votes
1answer
65 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 ...
1
vote
1answer
69 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 ...
1
vote
2answers
110 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 ...
1
vote
2answers
42 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 ...
3
votes
2answers
64 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 ...
1
vote
1answer
37 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 ...
0
votes
3answers
59 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 ...
0
votes
0answers
12 views

Temporal evolution and dynamics of free ions and charges in an electrolytic cell

I am interested in the dynamics of ions in an electrolytic cell. For example, consider two electrodes connected with a battery, in an aqueous solution of sodium chloride. Initial state: the circuit is ...
1
vote
2answers
70 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" ...
0
votes
1answer
26 views

Why internal resistance increase with drop in temperature but External resistance decreases with decrease in temperature? [closed]

Why does internal resistance of a battery increases with drop in temperature but opposite happens if it is external resistance and if both happens simultaneously then why is the effect not cancelled? ...
0
votes
1answer
32 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} - ...
1
vote
0answers
33 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 ...
0
votes
1answer
359 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 ...
0
votes
0answers
18 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 ...
0
votes
0answers
20 views

Calculating surface charge in Thomas-Fermi layer

My understanding is that chemical potential at the surface of a bulk crystal is concentrated at, and would be described by, the Thomas-Fermi Layer (see Ad-atoms and underpotential): https://www....
2
votes
4answers
768 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?
0
votes
1answer
52 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 ...
0
votes
0answers
16 views

Will diamagnetic levitation impede chemical reactions?

Scientists have shown that mice and frogs can be lifted using diamagnetic levitation (since they repel the magnetic field). But I'm wondering if diamagnetic levitation could be harmful to creatures ...
0
votes
1answer
59 views

Continuity of electric displacement field inside ion solution

I am trying to model transport of ions (calcium, potassium, chloride etc.) in water. The ions move because of the influence of diffusion and electric force and can be modeled by the Poisson-Nernst-...
0
votes
3answers
149 views

Confusion in definition of emf

The emf of a cell is defined as the work done per unit positive charge in taking it around the complete circuit of the cell (i.e. in the wire outside the cell and the electrolyte within the cell). But ...
1
vote
0answers
90 views

How does a battery create potential difference? [duplicate]

I'm in year 10 (9th Grade for the Americans) and I just had a question about physics. How does a battery create potential difference? It it because the electrons are gaining energy as they get pulled ...
0
votes
1answer
33 views

Can a voltmeter itself disturb the electrochemical potential of battery?

I'm trying to understand the effect on a system when a voltage of a system is measured by connecting a voltmeter. For example let's say we are trying to measure the voltage of a Li-ion battery. The ...
1
vote
1answer
43 views

Electric Battery

Some say that the battery supplies charge, some say that it only maintains potential difference, I've also heard that it maintains an electric field in the wire. I'm confused. What does battery ...
1
vote
0answers
40 views

Battery voltage jump when applying constant current

When a constant current is applied to a battery, its voltage jumps by a huge amount in a moment. It jumps up if we apply constant charge current and down if we apply constant discharge current. I know ...
0
votes
1answer
63 views

Green Aurora Light: Experimental Replication?

From what I've read, the green light found in the earth's auroras is the result of a reaction between oxygen and nitrogen (supposedly a new element was once proposed to explain it until the science ...
1
vote
3answers
94 views

Why doesn't a chemical reaction occur with the movement of electrons in the context of electricity?

In school it is generally taught that the movement of electrons between two atoms causes a chemical reaction. However, when it comes to electricity why doesn't a chemical reaction occur with the ...
0
votes
1answer
35 views

Do people work on improving battery efficiency by increasing entropy difference?

I have been reading a Daniel Schroeder's book called "An introduction to Thermal physics", and after having completed first couple of paragraphs of "Free energy as available work" (...
3
votes
1answer
90 views

Can electricity pass through a flat battery? [closed]

Let’s say there are 4 batteries in series in a circuit connected to a bulb. One of the battery is flat. Can the bulb still light up? I’m so confused now.
0
votes
0answers
18 views

Formulating electric potential in a battery

The electric potential $V$ around an electric field $E$ can be described with this formula: $$V=Ed$$ where $d$ is the distance from an electric charge. Now, if I recall it correctly from ...
0
votes
1answer
31 views

Does potassium ions have a longer range attraction than sodium ions or hydrogen ions?

Electronegativity decreases with period in in the periodic table. The explanation for that is because the distance to the nucleus decreases with each orbital shell of electrons, if I got that right. ...
1
vote
4answers
115 views

Why exactly do we feel a shock when we place our hand into a conducting solution?

I have a very naive question. Suppose you have pure water in a flask, and you place two ends of a copper wire (which are connected to a battery) into the water. If you were to place your hand into the ...
0
votes
2answers
199 views

Confusion between positive and negative terminals of a battery

I am confused that whether the positive terminal in physics refers just to a higher potential or a positive charge. This also comes from the fact that anode and cathode are differently charged in ...
1
vote
1answer
108 views

Lemon Battery Voltage Increase

Suppose I have 2 lemons each with a zinc nail and a penny for electrodes and I wire them up in series so that Nail-A passes through a load and connects to Penny-B and Nail-B connects to Penny-A. I ...
0
votes
1answer
83 views

What is the non-electrostatic force exerted on an electron in the given scenario?

My teacher was explaining emf to me and he was using an example of a simple electrolytic cell. In this example the two electrodes had been placed in the same solution and had been connected by a wire. ...
0
votes
0answers
22 views

The voltage across an electrochemical cell

Suppose I have a galvanic cell, like the one below In the other resources I checked (such as LibreTexts, Chem Pages, and Khan Academy), it is mentioned that the voltage across such a cell is ...
3
votes
2answers
104 views

What exactly happens when $\rm NaCl$ water conducts electricity? [closed]

Assume a DC power source with $2$ electrodes made of Fe. We dip those $2$ electrodes into table salt water. What happens exactly? Will $H^+$ and $Na^+$ migrate to the negative electrode by ...
1
vote
1answer
363 views

Will earthing an aluminium boat reduce the rate of hull corrosion?

First question here as I am having trouble getting a decent answer anywhere else, such as boat service workshops etc. I wish to reduce corrosion on an aluminium hull over its lifetime, hence this ...
1
vote
1answer
38 views

Why does a battery voltage depend on its state of charge?

I know that measuring the open-circuit voltage gives a good indication of the state of charge of a battery, both for rechargeables and single-use. But why is this so? As far as I can see the voltage ...
1
vote
0answers
73 views

What is the strength of current in electrolytes?

if a battery is connected to an electrolytic cell, what is the magnitude of the current in the electrolyte compared to the the magnitude of the current in the wire? This doesn't make sense to me ...
1
vote
0answers
16 views

In a Lithium Ion battery (during discharge) positive Li Ions flow to the +3.8 volt cathode. Where do they get the energy to climb that 3.8 V hill? [duplicate]

These positive $\text{Li}$ ions are flowing up hill to the cathode during discharge so where is the energy coming from that allows them to get over the hill?
0
votes
1answer
121 views

Does the EMF negate when a cell is being charged?

A defining equation of electrochemical cells is that the EMF, $\mathcal{E} = E_{red/cat} - E_{an/ox}$, equals the electric potential of the cathode minus that of the anode. This means that if a cell ...
2
votes
1answer
46 views

Nernst equation and very diluted solutions

Nernst's equation does not predict the correct potentials of very diluted solutions. Intuitively, I would say that in such conditions there are not enough reactive particles at the surfaces of the ...
0
votes
1answer
38 views

Does electromagnetic radiation cause auto-ionization of water?

The auto-ionization of water into $\text H^+$ and $\text{OH}^-$ is often described as occurring spontaneously, that at any given time a tiny portion of the water will be split into its cation and ...
0
votes
0answers
26 views

Microscopic interpretation of constant voltage from Battery

I don't know if this is the right place to ask(Maybe it's more related to chemistry), but this has been troubling me for some while. Consider you have a chemical cell. Then the reason for the ...
0
votes
1answer
116 views

Why do batteries need a loop to discharge?

I'm an electrical engineer who has been taught transistors and silison and solid state theory and all that. But when I apply the theory to batteries and cathodic protection, my understanding seems to ...
1
vote
3answers
309 views

Why does the internal resistance of a rechargeable battery depend upon whether it's charged or discharged?

The following text is from Concepts of Physics by Dr. H.C.Verma, chapter 32, "Electric Current in Conductors", page 199, 19: The internal resistance of an accumulator battery of emf $6\ \mathrm V$ ...