"Ecological security and environmental governance" is a theme of Guiyang International Forum on Ecological Civilization 20 14. Chemistry plays an important role in the prevention and control of air po

"Ecological security and environmental governance" is a theme of Guiyang International Forum on Ecological Civilization 20 14. Chemistry plays an important role in the prevention and control of air pollution and water pollution. (1) There are four possible chemical reactions * * * in the coal-fired furnace, that is, carbon completely burns to produce carbon dioxide, incomplete burns to produce carbon monoxide, carbon monoxide burns to produce carbon dioxide, and carbon dioxide reacts with carbon at high temperature to produce carbon monoxide; In order to make coal burn fully, it is reasonable to crush coal or blow a lot of air.

So fill in: 4; Blow in a lot of air or crush coal.

(2) According to the information in the figure, the carbon dioxide produced by the complete combustion of 1kg natural gas is similar to that produced by coal, but the sulfur dioxide produced is quite different, and the sulfur dioxide produced by natural gas combustion is less;

The reaction equation of hydrogen burning in air is: 2H2+O2? Light it? . ? H 2O and hydrogen as energy sources have the advantages of high calorific value and no environmental pollution.

Therefore: natural gas; 2H2+O2？ Light it? . ? 2H2O has high calorific value, and the product does not pollute the environment.

(3) According to the law of conservation of mass, the products are calcium sulfate and carbon dioxide.

Therefore, fill in: CO2. ..

(4) Paper mills will produce a large amount of alkaline wastewater containing NaOH, which can be neutralized with HCl before discharge to prevent water pollution.

Therefore: HCl ..

(5)① In the experiment of Figure 4, the main purpose of putting water into the gas container is to absorb the sulfur dioxide generated by the reaction.

Therefore, fill in: absorb sulfur dioxide produced by the reaction to prevent air pollution.

② In the experiment of Figure 5, the function of alcohol lamp is to burn unreacted CO to prevent air pollution. In order to prevent air pollution and save resources, your improvement method is to connect the duct at the end of the duct to the top of the flame of the alcohol burner.

So fill in: burn unreacted CO to prevent air pollution; Connect the conduit at the end of the conduit to the top of the alcohol burner flame.