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silver sulfide. its an oxidation process.
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∙ 10y ago
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What is the chemical name for a green coating on a coin?
For copper or some copper alloys coins the coating is hydrated copper carbonate.
What is the chemical property of coin?
I think to resistance to corrosoin.
What is the chemical name for As?
If it can be written :- as or As then it is a roman coin. If it is always written As (even in mid sentence) it is the chemical symbol for Arsenic.
What if you put gold in bleach and it doesnt turn black?
As bleach will not affect gold, it will not turn black! However, if the coin is actually brass it might...
Is oxidized pennies a chemical change?
To my knowledge, a penny is not a chemical change. No, I think it is instead a coin; a unit of currency, mostly made from zinc and plated with copper. Nothing I'm describing has anything to do with chemical changes.
What is the chemical name for the black coating on an old coin?
copper oxide
What is the chemical name for a green coating on a coin?
For copper or some copper alloys coins the coating is hydrated copper carbonate.
How much is an 1890 UN centavo coin worth?
The price of the coin depends on its condition here a link to a website so you can get an idea of what the coin on average sells for. http://listado.mercadolibre.com.mx/un-centavo-1890-mo.-republica-mexicana
What was the purpose of the steel coating on a 1943 penny?
The coating is zinc, the core of the coin is steel. Zinc was used to reduce corrosion.
How much is a 1890 dollar coin?
7-24-11>>> Assuming the coin is circulated and has no mintmarks, retail value is $38.00-$41.00 depending on how much wear the coin shows. The 1890 Morgan is a common date.
Is Melting coin being heated and turn black this is used as a test for metal a chemical or a physical change?
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Value of 1890 silver coin?
Need to know the country and face value of the coin - and condition.
What is the value of an 1890 US silver dollar with no mint mark?
Assuming the coin is circulated and still in collectible condition, the 1890 Morgan is a common coin, current average values are $38.00-$44.00 depending on the grade of the coin.
Who appears on the 1890 dollar coin?
It's an image of Liberty.
What does the letter V mean on a silver 1890 coin?
Anonymous
Who is on the 1890 us dime coin?
A seated Lady Liberty.
What can be the value of a 1890 Silver dollar?
Assuming the coin is circulated and has no mintmarks, retail value is $23.00-$31.00 depending on how much wear the coin shows. The 1890 Morgan is a common date.
