question_answer

  Copper powder is heated over aburner in a China dish. Write your observations and    chemical reaction involved. How can you get reactant back?

Answer:

                          When copper powder is heated over a burner in achina dish, the brown colour of copper changes toblack due of the formation of copper oxide.                                                                                                                                 (1/2)                                                                                                                                                    (1) When is heated with hydrogen, Cu is obtained back.                                                                           (1/2)                                                                                                                                           (1)