Question

A shiny brown element X on heating in air becomes black. Name the element X and black compound formed

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Answer 1

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Explanation:

"X" is copper (Cu) and the black colour substance is Copper oxide (CuO).

Equation of the reaction is:

Cu + O2 --> CuO

Balanced Equation:

2Cu + O2 --> 2CuO

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MORE TO KNOW ABOUT:

Copper:

Copper (Cu), chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature.

Oxygen:

Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.

Copper Oxide:

Copper(II) oxide or cupric oxide is the inorganic compound with the formula CuO. A black solid, it is one of the two stable oxides of copper, the other being Cu2O or copper(I) oxide (cuprous oxide). As a mineral, it is known as tenorite. It is a product of copper mining and the precursor to many other copper-containing products and chemical compounds.

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Answer 2

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