Question

Write an activity to show that the oxidation of copper to copper oxide.

 (OR) 

Write an activity for example of oxidation and reduction.

Answer 1

• Take about 1.0 gram of copper powder in a China dish. 
• Keep the China dish on a tripod stand containing wire gauze. 
• Heat it with a bunsen burner or with a spirit lamp.
• We can find that the surface layer of copper becomes black. 
• On heating copper reacts with oxygen present in the atmosphere to form copper oxide.
• Equation : 
• Here copper combines with oxygen to form copper oxide. 
• Here oxygen is gained and the process is called oxidation. 
• Now pass hydrogen gas over hot copper oxide. 
• We can observe that the black coating on copper turns brown because copper oxide loses oxygen to form copper.
• In this process oxygen is lost and the process is called ”Reduction”.
• Equation :