All Questions
Tagged with everyday-chemistry electrochemistry
56 questions
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Does cooling a phone in a fridge or freezer damage the battery (lithium-ion battery)?
I saw a fair amount of Reddit and Quora posts on whether cooling a phone in a fridge or freezer damage the lithium-ion battery but they give contradictory answers without any evidence or scientific ...
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1
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Please explain the difference between HFC technology and PEMFC technology
I understand how hydrogen fuel cells (HFCs) function, but what are the differences between them and PEMFC's?
I know that there are HT-PEMFCs and LT-PEMFCs, for low and high temperatures.
Do PEMFCs ...
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Is it possible to electroplate iron onto nickel in a sodium chloride solution?
Over the years I have salvaged many laptop and power tool batteries and collected a lot of metal strips, but I don't know if they are made of nickel or nickel-plated steel.
I have a piece that I know ...
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How fast does potassium hydroxide turn into potassium carbonate, in the case of leaked AA or AAA batteries? [closed]
When batteries start to leak, the highly toxic potassium hydroxide comes out, but it reacts with the carbon dioxide in the air and turn into the less toxic potassium carbonate salt. I'm wondering how ...
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3
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What is mAh/g Specific capacity?
In battery chemistry I've been reading about specific capacities of various electrochemical cells as $\pu{mAh/g}$. For example, in one article it says the specific capacity of the system is $\pu{75 ...
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Table of viscosity of water vs temperature
Above is the table for water physical properties table with temperature related with a,v,b,Pr,Ra factor. This table has temperature only from 0 to 100. May I ask if there is a full table for this with ...
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Why does the application of external mechanical pressure increase the performance of lithium-ion batteries?
Many electric vehicle batteries - specifically lithium-ion ones considered for this query - can be subjected to external mechanical pressure because it increases battery performance.
What components ...
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About the acidity of phenytoin
Can you explain why phenitoin is weak acid even though nitrogen is base?
Does carbonyl group always make structure acid?
If this structure doesn't have carbonyl group, would it be base not acid?
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What is the essence of chemistry? [closed]
I am an engineering student who loves physics but didn't quite enjoy chemistry.
a. When I was in high school chemistry to me was something not as inspiring as physics but in which I couldn't solve ...
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What is the optimal voltage for storing a 3.7 V lithium polymer battery?
According to this website, storing a lithium polymer (LiPo) battery/cell at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% ...
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Why do batteries drain so quickly if they are forced to draw more current than they normally do?
When a battery is pushed to use twice the current it normally does, it lasts for less than half as long before dying...
In fact, batteries often come with a 'C' rating that gives you an idea of how ...
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350
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Silver "polish" with aluminum foil left a hard yellow coat [closed]
I cleaned my silver teapot with the aluminum foil-baking soda-hot water method.
Usually this works well on my silver plated flatware.
However, this time it left a hard yellowish coating. I was only ...
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421
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What happens when you run house electricity through salt water?
What happens when you run house electricity (120VAC) through salt water? (with standard copper wires!)
Well, in https://youtu.be/dcrY59nGxBg , an interesting experiment was conducted to find out!
At ...
- 1,566
3
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Why does the rusting process start from the bent/squeezed portion of iron?
I have noticed that the rusting of iron starts from the squeezed or bent parts of iron piece.
I want to know what is the peculiar reason for the observation that rusting starts from bent or irregular ...
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Electrolytes for Anodization at Home
I'm looking into anodization, and all the people doing it seem to have sulfuric acid as their first choice electrolyte, while others use sodium metabisulfate. Having simple access to exactly neither ...
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Electrolytes are ionic compounds that conduct electricity [closed]
Electrolytes are ionic compounds that conduct electricity, or the flow of charged particles, when dissolved in water. This occurs via the separated ions acting as those charged particles, or charge ...
user78779
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275
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What defines a discharged battery?
In the case of an AA Alkaline battery, what actually happens inside the battery once it is fully discharged? What components of the battery change as we use it?
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what is the exact meaning of oxidation state? [duplicate]
can you mention the concept of oxidation state without its simple definition i-e it is the apparent charge +ve or -ve.....😪
I found these in wikipedia but didn't understand."Conceptually, the ...
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766
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What is the chemical reaction between coins (copper and nickel) and polyvinyl chloride?
I often carry coins in a cheap plastic sandwich bag. A green solid soon appears. Is it copper oxide? How is the polyvinyl chloride (or polyethylene or polypropylene) greatly accelerating the reaction?...
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Maximum possible hypochlorite concentration from electrolysis?
For reference, "electrochlorination" is just the electrolysis of a simple solution of water and table salt (NaCl) followed by reintroducing the chlorine gas produced.
But, the Wikipedia article on "...
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Why does a pickled gherkin glow only at one end when a current is passed through it?
I recently saw this Periodic Video.
The Professor (Martin Polyakoff) notes that,
The Gherkin normally glows only at one end due to excitation of $\ce{Na+}$ ions.
The end which glows can either be ...
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278
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What pulls the electrons from iron in rust formation?
In the first step of formation of rust in iron, there is something that pulls electrons from the iron lattice, resulting in the formation of $\ce{Fe^{2+}}$. The reaction is:
$\ce{Fe -> Fe^{2+} + ...
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391
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Decomposition through thermolysis, electrolysis, photolysis [closed]
What decides whether a compound will dissociate (break-up) under thermal decomposition or photolysis or electrolysis i.e if I am provided with a compound and I'm asked to dissociate it then how will I ...
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Will a film of oil on water retard evaporation (of water) and prevent air and atmospheric impurities from diffusing into it?
I vaguely recall hearing that a layer of oil on water will slow down the evaporation of water, as well as serving as a barrier that would prevent (or retard) the diffusion of air and atmospheric ...
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1
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342
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How was the potassium battery invented?
It is said that mobile phones using potassium battery can be charged within a few minutes. Was it an accidental discovery or the companies made a new design for faster charging?
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Cleaning with sodium bicarbonate
I have a small metal, most likely silver, cross. It is an old object and has turned dark. In order to clean it, my mother told me to boil it for a few minutes in water containing sodium bicarbonate.
...
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Why does aluminum foil "electrocute" dental fillings?
This is probably one of the weirdest questions on here. When I was a kid, I put aluminum foil in my mouth (maybe it was still attached to some food or something, I don't remember.)
Anyway, it made my ...
- 6,802
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112
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How to slow/prevent corrosion of a steel post
I have a steel post set in limestone, about 18-20 inches deep, with some concrete around it.
I just noticed that I have about 6 inches of water inside the post. The limestone had a small seam in it ...
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2
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Would an amalgam filling under or next to a gold crown cause any electrochemical reaction?
Would a mercury amalgam filling deteriorate faster if it was in contact with a gold crown?
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What's the chemical equation for the lithium iron phosphate battery
The title says it all, I'm searching for the chemical equation to the lithium iron phosphate battery.
I know that the cathode is made of $\ce{LiFePO4}$ and that upon discharging, it is transformed to ...
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Could a lead-acid battery electrolyte be replaced by hydrochloric or nitric acid?
Hydrochloric acid, as well as nitric acid, are also strong acids like sulfuric acid. So, why are not they used commercially in lead-acid batteries?
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What Type of Gas Would Vinegar and Epsom Salt Create Under Electrolysis?
I'm restoring a motorcycle and have a small homemade DIY zinc plating operation which consists of vinegar, epsom salt, a piece of zinc and a power supply.
When I plate a steel piece such as a bolt or ...
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What is the reason of explosion of batteries?
In social sites we see many pictures showing awareness of not using smartphone while charging because of the reason that battery explode while charging, is really batteries explode and if yes than ...
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What is the composition of the oil-like fluid that seeps out of dry-cells over time?
An experience a lot of us might've had; a dry cell (not completely depleted) when left in an electrical device for long periods of time, has this viscous fluid coming out that usually corrodes the ...
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750
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Using a calcium metal anode in aqueous solution?
In school, I am doing an electrochemistry lab in which I need to create a galvanic cell battery with the highest voltage possible using two beakers, a salt bridge, and electrodes.
To maximize the ...
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Lemon Battery works on water?
My son and I were using a mini science experiment kit for creating batteries with copper, zinc, and lemonade, similar to the famous lemon battery project. My son's hypothesis was that the liquid had ...
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Does relative amount of lithium and cobalt oxide change in recharged battery?
There is a question on my assignment about stoichiometry. I spent 2 whole days searching and review this topic but still clueless.
Reaction in lithium ion battery
$$
\ce{Li(s) + CoO2(s) → LiCoO2(s)} \...
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3
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protecting contact between aluminium and copper wires
The quarters in which I live has both aluminum and copper household wiring. This results in corrosion of the contacts and can lead to sparking, overheating, and even fire.
Is there any way to ...
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Could milk rust a steel teaspoon?
Recently, while cleaning a neighbour's fridge (turned off for a few weeks), I came across a cup (closed with a lid). Inside the cup was, to my olfactory horror, congealed milk, with a steel (iron) ...
user15489
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1
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Does the Battery Bounce Test actually work?
I heard that a good way to test if a battery is dead or alive is to see if it bounces. Supposedly, dead batteries bounce higher than living ones. Can someone tell me if this is a legitimate claim, and ...
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1
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Accelerated Oxidation Of Iron When Coating Breaks
I was presented with the following information:
If iron is painted, then oxygen and water are prevented from contacting the metal, and corrosion is avoided.
Sometimes the iron is coated with a thin ...
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Could I settile for galvanized steel over stainless for salt corrosion resistance?
Bear with me, I'll get to the chemistry soon.
I have a float tank that I want to attach a skimmer to. Unfortunately, the enclosure is weakened by cutting a hole out of the ABS plastic. The weight ...
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Reviving a 6 Volt lead-sulfuric acid battery
I have a 6 Volt sulfuric acid battery used to power a golf cart that has all the acid drained out, and the usual solution was to add more water to the battery however I am afraid that would not work ...
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Galvanic Cells, theoritical voltage [closed]
This reaction proceeds in the galvanic cell:
$$\ce{Zn + Pb^{2+} -> Zn^{2+} + Pb}$$
I need the equation for the half-reactions of this cell and the theoretical voltage produced by this cell if ...
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Electrochemistry (Spontaneous Reactions)
Determine which of the following pairs of reactants will result in a spontaneous reaction at 25 celsius?
Pb2+(aq) + Cu(s)
Ag+(aq) + Br-(aq)
Li+(aq) + Cr(s)
Fe3+(aq) + Cd(s)
None of the Above.
I'...
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1
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How do chemical reactions taking place in an alkaline battery produce electrons?
I'd like to understand the chemical reaction in a typical alkaline battery a little better and how that produces a flow of electrons. I read wiki, how stuff works, and some more advanced articles. ...
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Are homemade batteries a practical alternative during a blackout?
If your home lost power without warning; are homemade batteries (such as the lemon/potato variety described in this question Are homemade batteries economically practical?) a practical alternative for ...
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2
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2k
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How does a simple alkaline battery work?
The basic + - electrolyte set up. Modern batteries and the like. How exactly do they work?
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Loading nickel metal hydride battery for the first time
I just bought a new hair clipper and I was about to start shaving my head when I noticed that it was almost at 0%. It has a nickel metal hydride battery.
The manual says I have to load it for 24h ...
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482
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Why don't B, C, Si, have ionic forms? [closed]
Also, why can some elements such as $\ce{Fe}$ have different ionic forms such as $\ce{Fe^{2+}}$ and $\ce{Fe^{3+}}$? What determines each form?
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