Name two metals which at tarnished. Why does this happen?
Answers
Answer:
But both are types of oxides. When you see that green layer on these metals (usually called patina or verdigris) it's because of a chemical reaction. The copper has reacted with oxygen, water, and carbon dioxide in the atmosphere.
Explanation:
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Answer:
Explanation:
Tarnish is a thin layer of corrosion that forms over copper, brass, silver, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting.
Tarnish actually preserves the underlying metal in outdoor use, and in this form is called patina. The formation of patina is necessary in applications such as copper roofing, and outdoor copper, bronze, and brass statues and fittings. Patina is the name given to tarnish on copper based metals, while Toning is a term for the type of tarnish which forms on coins.
THE TWO METALS ARE-:
iron, copper,etc.....