Experimental conclusion: when the green solid is heated to complete decomposition, the anhydrous copper sulfate in device B turns blue, which indicates that water is generated by the reaction, so it can be determined that the substance contains hydrogen and oxygen elements; The lime water clarified in equipment C becomes turbid, indicating that carbon dioxide is produced, and it can be determined that the substance contains carbon and oxygen elements; Solid appeared on the bronze ware, and the green solid in device A gradually turned black, so the black solid may be copper oxide with dilute sulfuric acid. It was observed that the black solid gradually dissolved and the solution turned blue, indicating that the black solid must be copper oxide. The original solid contained copper and oxygen, so the green solid contained hydrogen, carbon, oxygen and copper.

Expression and communication: (1) The blue solution generated by the reaction between copper oxide and sulfuric acid is copper sulfate solution. Take a small amount of blue solution in the test tube and immerse it in clean iron wire. It was observed that red substances were precipitated on the surface of iron wire, which were ferrous sulfate and copper sulfate produced by the reaction of iron and copper sulfate. The equation is: Fe+CuSO4 = FeSO4+Cu.

(2) After the reaction is completed, if the alcohol lamp is removed first, the temperature and pressure of the gas in the test tube will be reduced, and the water in the water tank will be sucked back into the device B; If two devices, B and C, are switched, the gas will bring out water vapor when passing through C, and it is uncertain whether there is water when heating green solid.

Ask questions about the formation or properties of green solids, and guess according to the above exploration of patina;

So the answer is:

Experimental conclusions: hydrogen, carbon, oxygen, copper;

Expression and communication: (1) Fe+CuSO4 = FeSO4+Cu; (2) The liquid in device C will flow back to device B; No, if you switch, you can't prove whether there is water generated by heating green solids.

Ask questions and guess how the green solid is formed. It may be that the green solid generated by the complexation reaction of Cu with O 2 and H 2O (gas) can react with dilute HCl? can