on heating copper powder in a China dish, the surface of copper powder becomes black (chemical reaction)
Answers
ANSWER:-
When the “copper powder” is heated in a ‘china dish’, the copper powder surface becomes coated with “black colour substance” due to the formation of ‘copper oxide’ by surface oxidation.
EXPLANATION:-
Copper reacts with oxygen in the air upon heating and forms copper oxide. The black colour is due to the formation of this copper (II) oxide.
The copper oxide thus formed can be reduced to its basic metal form by reducing it with hydrogen or carbon monoxide.
The equation of ‘copper (II) oxide’ formation is:-
2Cu(s) + O2(g) ----> 2CuO
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Answer: when Cu is heated in air (presence of oxygen) the surface of Cu becomes black due to corrosion.
It reacts with oxygen easily to form a corrosive layer and the by product is form is copper oxide
Explanation: