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  • You might have noted that when copper powder is heated in a china dish, the reddish brown surface of copper powder becomes coated with a black substance. (a) Why has this black substance formed ? (b) What is this black substance ?</

You might have noted that when copper powder is heated in a china dish, the reddish brown surface of copper powder becomes coated with a black substance.

(a) Why has this black substance formed ?

(b) What is this black substance ?

(c) Write the chemical equation of the reaction that takes place.

(d) How can the black coating on the surface be turned reddish brown ?

 

 

 

 
 
 
 
 

Answers (1)

(a) Black coloured substance is formed due to reaction of copper (cu) with air, oxidation of copper takes place.

(b) Copper (II) oxide (C_{4}O)

(c) 2Cu(s)+O_{2}(g)\rightarrow 2C_{4}O(s)

(d) On passing hydrogen gas (H_{2}) over the heated material.

Posted by

Sumit Saini

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