As early as 5,000 years ago, our working people would use charcoal to refine copper. To simulate the refining of copper in a chemistry laboratory, both the traditional experimental setup (see Figure A

As early as 5,000 years ago, our working people would use charcoal to refine copper. To simulate the refining of copper in a chemistry laboratory, both the traditional experimental setup (see Figure A) can be used. Make a guess about the composition of the red solid: ③ both Cu and Cu2O.

Experimental investigation

(2) According to the reaction C + 2CuO

? High Temperature? .

?

2Cu+CO2↑ can be seen, the reaction process there is carbon dioxide production, so the lime water will become turbid;

(3) the red solid partially reduced, presumably containing Cu2O, so the drop should be dilute sulfuric acid, cuprous oxide and dilute sulfuric acid reaction to generate copper sulfate, copper and water, so the solution becomes blue, so guess ① is wrong;

By the chemical equation Cu2O2, it is possible that the reaction process can produce carbon dioxide. p>By the chemical equation Cu2O + H2SO4 ═Cu + CuSO4 + H2O know, every 144 copies of the mass of cuprous oxide will generate 64 copies of the mass of copper, if there is a 1.44g of cuprous oxide will generate 0.64g of copper, and the actual collection of the mass of copper is 1.04g, so 1.44g is a mixture of cuprous oxide and copper.

Evaluation and reflection

(1) the miniature experimental setup uses less drugs, saving drugs;

(2) the catalyst can change the rate of chemical reaction of other substances, and its own mass and chemical properties before and after the chemical reaction remain unchanged, so if you want to prove that CaC12 is the catalyst of the reaction, you also need to verify that the mass and chemical properties of CaCl2 before and after the reaction unchanged;

(3) the forerunner of modern hydrometallurgy, as early as the Western Han Dynasty, Liu An in the "Huainan Wanbiju" wrote "CuSO4" to "Cengqing (CuSO4) to get the iron is copper," which is "Cengqing" refers to copper sulfate. The meaning of this sentence is that: copper sulfate solution meets the metal iron, iron and copper sulfate replacement reaction can produce metal copper, the chemical equation of the reaction is: Fe + CuSO4 ═ FeSO4 + Cu.

The answer is: to make a conjecture that there are both Cu and Cu2O;

experimental investigation

(2) become turbid;

(3) Dilute sulfuric acid, blue, ①; ③;

Evaluation and reflection

(1) conservation of medicines;

(2) mass and chemical properties remain unchanged before and after the reaction;

(3) Fe + CuSO4 ═FeSO4 + Cu.