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Because its called copper oxide from when the copper coin mixes with oxygen in the air. thats why alot of old coins are black.

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12y ago

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What is the significance of a black contrail in the sky?

A black contrail in the sky can be significant because it may indicate the presence of soot or other pollutants in the atmosphere, which can have negative effects on air quality and the environment.


What causes the phenomenon of black contrails in the sky?

Black contrails in the sky are caused by the exhaust emissions from aircraft engines mixing with atmospheric conditions, such as temperature and humidity, resulting in the formation of soot particles that appear black in color.


What is the black powder used to melt ice bergs?

The black powder used to melt icebergs is typically a mixture of soot and oil. When spread over the surface of the iceberg, the black color absorbs more sunlight, increasing the rate at which the ice melts.


Chemical name of so2?

The composition varies depending upon the hydrocarbon burned. However, by definition, soot is the black solid or tarry substance produced during hydrocarbon combustion. Analysis has revealed the presence of some smaller molecular weight liquid hydrocarbons such as C8 compounds to C20 but for the most part more stable polyaromatic hydrocarbons are formed. These polycyclics have been implicated in cancer. They are known carcinogens.


Why does snow turn black when burned?

If your snow burns, I have no idea why it turns black, because it wasn't what I would call snow in the first place.Burning other things near snow may result in black soot deposits on the snow. Perhaps that's what you meant.

Related Questions

What is the black particle of an naphthalene when it gets heated?

soot


Black powdery stuff in a chimney?

I think you might be talking about soot. Soot is the leftover stuff from when wood or other materials are burnt.


What is the black stuff that people are covered in after an explosion called?

Soot.


Why is black soot formed when the flame is luminous?

The black deposit produced represents soot particles, heated to incandescence. It comes about when the combustion of air is insufficient.


Why oil become black after a while?

Because what the engine is basically doing is burning stuff, and when you burn something you usually get soot and some ashes. Some of that soot gets trapped int he oil, and is what makes it black.


What is the name of the black solid which collects on the outside of an evaporating basin when it is heated by a yellow Bunsen flame?

The black solid that collects on the outside of an evaporating basin when heated by a yellow Bunsen flame is likely soot. Soot is a carbonaceous substance formed from incomplete combustion of carbon-containing materials.


What is the color of soot?

Soot is typically black in color.


What is the black substancecreatedmade by a yellow Bunsen burner flame?

The black substance created by a yellow Bunsen burner flame is typically soot, which is carbon particles that have not fully combusted in the flame. The yellow color of the flame indicates incomplete combustion, leading to the production of soot as a byproduct.


What is a 4 letter word that means a black substance that comes from burning wood?

soot


What happens when methane is heated strongly?

When methane is heated strongly, it undergoes a process called pyrolysis, breaking down into simpler compounds like carbon and hydrogen. This can result in the formation of volatile hydrocarbons, carbon black, and even soot.


Why does porcelain go black when heated over Bunsen burners?

Porcelain will turn black when heated over a Bunsen burner due to carbon deposits from incomplete combustion of the gas. The carbon particles are deposited on the surface of the porcelain, causing it to appear black.


What is a noun for soot?

Soot is a noun. It is the black residue left behind by burning some substances.