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Why don't the electrodes of a fuel cell deteriorate the way the electrodes of a battery do?
The electrodes of a storage battery, particularly the lead - lead dioxide batteries commonly used in starting vehicles, may deteriorate because the discharge reaction requires one or both of the solid electrodes used to dissolve partially in the electrolyte, and the recharging reaction requires depositing new solid on both electrodes from the electrolyte. In order to maximize the possible output of electric current from a battery during the discharge or working phase, the electrodes have special surface characteristics that maximize their effective surface area. Both the charging and discharging phases of use of a battery of this type often decrease the effective surface area of the solid electrodes, and the recharging in particular may deposit solid on one or both of the electrodes in a shape that causes it to short to the other electrode. This does not occur in fuel cells, because the solid electrodes of a fuel cell do not dissolve during use. Instead, the electrodes serve (1) as catalysts to promote the oxidation and reduction reactions of fuels supplied to the electrodes as liquids or gases dissolved in the electrolyte and (2) to accept or furnish the electrons needed for the reactions to occur at separate locations. Furthermore fuel cells never need recharging, because the reactants consumed are replenished from outside the fuel cell itself and not regenerated within the cell, as for a storage battery.
Do chlorine tablets get old?
Yes, they do. If you are using the kind of chlorine tablets that dissolve, then they need to be replaced often.
Why are carbon anodes replaced regularly?
I doubt this is useful since this was posted 4 years ago, but carbon anodes have to be replaced in commercial use because they react with the oxygen that is reacts with (or so i think), and therefore the co2 that comes from the carbon and metal oxide in the displacement reaction makes the carbon anodes turn into co2 and therefore these anodes need to be replaced
Why is compressed oxygen used instead of compressed air in space?
Oxygen is the component of air that we consume, so it must be continuously replaced as the astronauts breathe it. The the other components of air, mostly nitrogen, simply come from the initial air supply and do not need to be replaced.
Is valence the same as oxidation number?
Yes, but only if its positive. If its negative, it shows the number of electrons need to become stable.
How often do golf cart tires need to be replaced?
It depends on the use, but yes, they have to be replaced periodically.
Why you need to replace positive electrodes?
aho 3'alasa keda :P
How many electrodes does an Electroencephalography need?
Approximately 16-20 electrodes
How many electrodes does an EEG need?
Approximately 16-20 electrodes
What is the life expectancy of the wireless keyboards compared to regular keyboards?
Wireless keyboards have just as long of a life expectancy as wired keyboards, but they do need their batteries replaced periodically.
Why is it necessary to periodically assess and evaluate policies?
is it necessary to have periodically assess and evaluate policies because it determines whether the policies are still current & relevant to your organisation & to its clients. Whether the policies suits their intended purpose or whether they need to be changed, eliminated, replaced or even updated.
Cycle chains and machine parts are greased regularly why?
For lubrication, which reduces wear on them. In general lubricants pick up dirt and become less effective over time, and need to be replaced periodically.
Would two magnesium electrodes make a good wet cell that produces a lot of voltage why or why not?
No, because they are the same conductor and do not make a "ramp" for the electrodes to move along. They need to be different in order to make the electrodes move.
The cost of making sodium hydroxide includes the cost of the raw materials used what other costs involved in making sodium hydroxide?
To make sodium hydroxide, you need to electrolyse the solution of sodium chloride. Electricity is needed for electrolysis and that will cost money. There will also be the cost of equipment such as electrodes. (Electrodes have to be replaced after a while). Lastly, there may also be the cost of labour. The men who make sodium hydroxide will need to get paid.
Why does your alternator get hot and car shuts off when you remove positive wire?
The alternator is going bad, may need to be replaced soon
What kind of regular maintenance do Viking sewing machines need?
Viking sewing machines need little maintenance, but dirt, lint and threads and anything sticky needs to be cleaned out regularly. Although rare, parts may need to be replaced periodically. Make sure to read through the product manual.
What activates oil change light?
When you are low on oil, your oil is dirty, or when the oil filter needs to be replaced. Some cars also will turn on the light periodically based on the number of miles that the average driver takes to need new oil.
