The decomposition reaction of (1)C is a chemical reaction.

(2) Basic copper carbonate [Cu2(OH)2CO3] is solid and needs heating to react, so experimental device B is selected;

(3) check whether it contains CO2； with clarified limewater; The clarified limewater became turbid, which proved that CO2 was produced in the experiment.

(4) It does not react with dilute sulfuric acid, which proves that the red solid is Cu; If the solution turns blue, it proves that it contains Cu2O, and the reaction occurs: Cu2O+H2SO4 = Cu+CuSO4+H2O; Finally, the mixture of Cu and Cu2O was determined.

So the answer is: (1) C.

(2)B； The reactants are solid and need to be heated.

(3) clarifying limewater; Clear limewater becomes turbid.

(4)① copper; ② The solution turns blue; ③Cu2O； ④ mixture of copper and cuprous oxide