The problem of the composition of the chemical gas, urgent

This is because the body consumes oxygen and produces carbon dioxide.

Oxygen is obtained from the inhaled air and is exhaled in lower levels.

Carbon dioxide is excreted, so the amount rises when exhaled.

However, air passing through the human body, especially in the mucous membranes of the respiratory tract and blood, can bring some moisture.

The moisture is expelled in the form of water vapor.

In that winter, you can only see the breath, which is the small droplets of water vapor liquefied.

Note that he is talking about the content, but only the proportion of it.

First of all, it is necessary to understand that respiration absorbs oxygen in the air and releases CO2, but under normal circumstances, human respiration absorbs air, and releases a large amount of CO2, a small amount of O2, and some water vapor.

Secondly, it is important to understand that the concentration of CO2 and water vapor in the air is very low.

Finally, so the result of respiration is that the oxygen in the air is consumed, the CO2 concentration increases, and the water vapor increases.

The relative molecular mass of air is about 29, so a gas with a molecular mass greater than 29 is denser than air.

Most of the oxygen breathed in is utilized, and very little is exhaled.

Exhaust gas from the lungs is exhaled through the mouth or nose, so it contains more water than air.

This is related to living things.

During breathing, a person inhales air (a mixture of gases) and exhales a mixture of gases. When air enters the lungs, it exchanges gas with the blood (this happens on the alveoli), sends some oxygen into the bloodstream, and brings out some carbon dioxide. Therefore, in the exhaled breath, the CO2 content is greater than that of air and the O2 content is smaller than that of air.

In addition, the respiratory tract is relatively humid, so the content of water vapor in the exhaled breath is greater than that of air.

Isn't that obvious?

The teacher said that the CO2 content of the exhaled air is greater than that of air, why is it larger than air?

Because the oxygen you breathe in reacts with the glucose in your body to produce carbon dioxide 6O2 + C6H12O6 (glucose) ==6CO2 + 6H2O, and the teacher said that the content of O2 in the exhaled air is smaller than that of air, why is it smaller than air?

Because the oxygen you breathe in and the glucose in your body react with the teacher, and the water vapor content in the exhaled air is greater than that of the air? Why is it bigger than air?

Because breathing brings out the water in your body.

When breathing. Absorbs oxygen and excretes carbon dioxide.

The gas passed through the body and the humidity was high.

Questions 2 and 4 of the first question

Question 2: Plant garbage in the garbage heap, wood produces methane gas in an anaerobic environment, and the bungalow will use an open fire to heat in winter, which is caused by methane gas.

Plant-based waste wood.

The methane produced burns when it encounters fire, which in turn causes **.

(1 point) The landfill includes the following different substances: glass, vegetable waste, cement, wood, steel, etc. Among these substances, two substances are indicated that can produce methane gas. 2 and 4 Fill in the numbers).

Because the ** limit of methane gas is. When the concentration of methane mixed with air is lower, the mixture neither burns nor **, and when the concentration of methane is higher than 14, it can be burned but does not react.

CH4 (gas, gas) accumulates to a certain amount and encounters an open flame or reaches a sufficient temperature, which causes a violent ** accident.

First of all, it is clear that at this temperature, reactants and products should be treated as gases. This kind of problem is typical of the difference method.

If the reactant is cxhy, then the reaction equation after trimming is:

cxhy+(y/4 +x)o2==xco2+y/2 h2o δv=（x+ y/2 -1-x- y/4)=y/4-1

1 mol (y/4-1)mol

3l 17l-(3l+14l)=0

Because of the peculiarity of δv=0, y 4 -1 = 0, so y = 4

And because the question states that the gas mixture is composed of alkanes and alkynes, no matter which one of them, the hydrogen atom in the molecular formula should meet 4 conditions, and the alkanes that meet this condition are only methane (CH4) and alkynes only C3H4.

Another: more than 100, the volume of hydrocarbons remains unchanged before and after complete combustion, and the number of hydrogen atoms in the molecule is 4, which is best remembered.

First of all, it is ruled out that it is not the problem of oxidation that causes the appearance of odorous SO2 and other gases, because the time is short; Sealed state, air is present but less.

The two upstairs said that the problem is relatively clear, only the possibility is that the microorganisms host sweet potato vines digest the organic components of NH3 and H2S and other gases, the specific digestion process is like the human body various mold digestion organic components, and finally the excrement has a pungent odor.

To sum up, just according to my personal understanding, I hope it can help you, thank you!

I'm also a rural baby, and I've also worked on sweet potatoes, and I'm also studying chemistry, but I don't have the same feeling as you, if there is any gas, I think it should be the gas decomposed by microorganisms. There may be sulfur compounds, or nitrogen oxides, but I haven't seen them.