Plastic bags once brought great convenience to people's lives, but now they are called "the worst invention of mankind". Our country stipulates that from June 1, 2008, in

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Experimental research (1) ① Directly write the name of the instrument as: separatory funnel;

② According to the meaning of the question, you can know that the selected device can produce both oxygen and oxygen. To obtain carbon dioxide gas, you should choose device B. To produce oxygen, you should choose hydrogen peroxide. Therefore, the chemical equation of this reaction is: 2H2O2?MnO2?.?2H2O+O2↑. This reaction is a decomposition reaction;

< p>③The gas collected by the exhaust method is not very pure but relatively dry, while the gas collected by the drainage method is relatively pure but not dry. Therefore, if you want to obtain purer gas, you should choose the drainage method to collect oxygen, that is, device C;

④ Oxygen is difficult to dissolve in water, and its density is much smaller than that of water, so if you use D device to select the drainage method for collection, it should enter the gas collecting bottle from pipe C;

( 2) ① According to the analysis, it can be known that device B is used to verify the presence of water, device C can be used to verify the presence of hydrogen chloride, device D can be used to verify the presence of carbon dioxide gas, and device E can be used to test the presence of carbon monoxide, so considering that the gas passes through the solution It will bring out water vapor, so you should check the presence of water first, and hydrogen chloride can react with calcium hydroxide, so you should first pass the C device to verify and absorb the hydrogen chloride, then check the presence of carbon dioxide, and finally check whether it contains carbon monoxide, so this The connection sequence of the pipes in the device is: bcedgfh (or cbedgfh);

②According to the answer to question ① in (2), we can know that device B is to verify and absorb water vapor, while device C is to verify Hydrogen chloride gas, so the phenomenon in device C is the production of white precipitate, and the reaction in device D is: Ca(OH)2+CO2═CaCO3↓+H2O;

③We know that device E is To verify the existence of carbon monoxide, if carbon monoxide exists, combustion will produce carbon dioxide, so clear lime water should be used to verify whether it contains carbon monoxide. From the question, we can know that there is no obvious phenomenon to judge that the mixed gas does not contain carbon monoxide;

Experimental conclusion: Based on the analysis just now, it can be concluded that the combustion of polyvinyl chloride plastic produces carbon dioxide, water and hydrogen chloride gas, that is, conjecture 2 is correct;?

Experimental reflection ① Paid use of plastic bags It can remind people to control the amount of plastic bags, and at the same time it can reduce white pollution, save energy, etc.;

②C and D cannot be exchanged when connecting the device, because the HCl in the original mixed gas will mix with the device D ?Ca(OH)2? reacts without any phenomenon. Device C cannot play the role of verifying the existence of HCl.

So the answer is: Propose conjecture 1; According to the question and information, polyvinyl chloride produces a colorless mixed gas after burning in the air, but in conjecture 1, Cl2 is a yellow-green gas, so Guess I is wrong;?

Experimental exploration (1) ①Separating funnel?

②B; 2H2O2?MnO2?.?2H2O+O2↑; Decomposition;?

③C; ④c;?

(2) ①bcedgfh (or cbedgfh);?

②Check whether water is generated;?A white precipitate is produced; Ca(OH)2 +CO2═CaCO3↓+H2O

③Clarified lime water; carbon monoxide or CO;

Experimental conclusion: 2;?

Experimental reflection (1) Reduce white color Pollution or environmental protection or energy conservation;?

(2) No; The HCl in the original mixed gas will react with the Ca (OH) 2 in device D, but there is no phenomenon, and device C will not work It’s time to verify the presence of HCl.