the green patina of copper is desirable
Cu(OH)2 --> CuO + H2O
It is simply because they could not be found together!! copper can be estimated by treating with potassium iodide and iodine will be liberated in the reaction which is titrated against sodium thiosulphate during the reaction we will add sulphuric acid to prevent the hydrolysis of copper sulphate and we follow by, adding ammonia to neutralize sulphuric as it may hinder the reation between iodide and copper!! now again we will add acetic acid to neutralize ammonia.. and the indicator is added at the last because it will get absorbed with the iodine!! now atlast we add ammonium, thiocyanate to prevent the excess of iodine getting added to copper iodide. end point is disappearance of blue color.
copper is higher in galvanic series than steel.hence when steel bolt is attached to copper equipment the copper being higher in galvanic series acts as anode getting corroded and steel being lees in galvanic series acts as cathode getting protected. copper equipment gets corroded when steel bolt is attached to it.
Almost certainly 5 cents. US nickels don't have enough copper in them to look copper-colored. Your coin is most likely discolored due to exposure to heat, chemicals, or other contaminants.
it is coated in copper. copper prevent corrosion.
No US nickels have ever been struck in copper. The alloy they're made from contains copper but it's not enough to give the coins a copper color. Your coin was probably discolored due to dirt, exposure to heat or chemicals, or some other contaminant.
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Copper may play a role in preventing osteoporosis.
No. All 1955 nickels are made from the standard alloy of 25% nickel and 75% copper, and have the same color as other nickels. Your coin may be discolored due to exposure to chemicals or heat.
If this is a change in the appearance, see a doctor about it. It would be a shame to have to cut it off.
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