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

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asked Jan 9, 2018 in Chemistry by sforrest072 (157,439 points) ● 60 ● 409 ● 931
edited Jan 24, 2018 by Vikash Kumar
A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' and the black coloured compound formed.

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answered Jan 9, 2018 by faiz (82,347 points) ● 6 ● 6 ● 11
selected Jan 24, 2018 by Vikash Kumar
 
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Element X is copper. The black coloured compound formed is copper oxide.
2Cu +   O2 +Heat ------>2CuO
Copper   Oxygen       Copper oxide
(Brown)                   

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