Some people say that the breath exhaled by a person is all CO2, is it correct and why

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Definitely not, the main breath exhaled by people is nitrogen at 69%, carbon dioxide at about 14%, and other water vapor at 10%, oxygen at 7% and other gases at 2%.

No, the breath exhaled by humans is 14% carbon dioxide, nitrogen 69%, water vapor 10%, oxygen 7% and other gases 2%.

If not, there will be some smelly gases such as vapor and nitrogen.

Not correct, there will be at least some moisture.

Wrong, there are nitrogen and noble gases, and there is also a part of oxygen and water, and you can prove that there is water if you put a glass plate in front of your nose and exhale a few breaths.

This is the way the human body metabolizes.

It's all cos, which can be proven in junior high school (with lime water).

As for water, it's not a gas.

Categories: Education Academic Exams >> Study Help.

Problem description: I read that the book says that there is a lot of oxygen, so why do people keep saying it?"We humans inhale oxygen and exhale carbon dioxide"?Isn't that misleading? Besides, that's the point of my question, why is there more oxygen in the breath that people exhale?

Analysis: Human inhalation of oxygen, exhalation of carbon dioxide This sentence can be said to be true or wrong, in fact, nitrogen is the most in the air composition (accounting for 78% if memory serves), followed by oxygen (more than 20%), carbon dioxide only accounts for a small part, we only use up part of the oxygen in each breath, and not all of it, the carbon dioxide content in the exhaled air is more, but the oxygen content is still very small compared to this time.

People exhale not all carbon dioxide, but also water.

Respiration is a process of obtaining energy through redox, and respiration includes both aerobic and anaerobic respiration. Aerobic respiration refers to the process in which cells thoroughly oxidize and decompose organic matter (usually decomposing glucose) through the catalytic action of a variety of enzymes with the participation of oxygen, produce carbon dioxide and water, release energy, and synthesize a large amount of ATP.

The purpose of the clarified lime water in the i bottle is: (to remove carbon dioxide from the air).

The purpose of the clarified lime water in the II bottle is: (to prove that the breath exhaled by the person contains carbon dioxide).

The function of the III bottle is: (buffering effect, preventing the person from inhaling lime water when inhaling).

Process: The air on the left comes in, I removes CO2, and enters the human mouth, which proves that CO2 is not the air that comes from, and the exhaled air enters II through the buffer of III, and it is found that the lime water becomes turbid, which proves that the exhaled air has CO2

2 Carefully insert the beverage tube into the gas collection bottle and blow slowly into the gas collection bottle (be careful not to pour it out when ventilating, indicating that the exhaled air contains more CO2 and the air contains very little CO2. (CO2 and clarified lime water reaction.)

In terms of the proportion of breath exhaled by people, there is still more oxygen than carbon dioxide.

The normal air content is about 79% nitrogen

Oxygen is about 21%, carbon dioxide is about.

After human respiration, gas exchange occurs at the alveoli (using gas diffusion), and the carbon dioxide content rises a little, while the oxygen content decreases a little!

About 79% of the exhaled breath is nitrogen

Oxygen is about 16%.

Carbon dioxide is about 4%.

It can now be seen that the oxygen content of the exhaled air is 5 percentage points lower than that of the inhaled air, but it is still 12 percentage points higher than the carbon dioxide (which has increased by almost 4 percentage points).

1 Fill 1 gas collection bottle with water, and cover a small part of the bottle mouth with a glass piece first, then push the glass piece to cover the bottle mouth completely, and put the bottle filled with water and the glass piece upside down in the sink.

2 Carefully insert the drink tube into the cylinder and blow slowly into the cylinder (be careful not to suck the water in the cylinder during ventilation) until the bottle is filled with exhaled gas. Immediately under water, close the mouth of the gas collector cylinder with a glass piece, and then remove it and place it on the experimental table.

3. Take 1 empty gas collection cylinder, the bottle is air, drop a few drops of clarified lime water into each bottle of air and a bottle of exhaled gas to observe the oscillation, there will be white precipitate in the gas collection bottle filled with exhaled gas, and it is almost invisible in the gas collection cylinder filled with air.

It indicates that the exhaled air contains more CO2 and the air contains very little. (CO2 reacts with clarified lime water to produce a white precipitate).

What is the difference between the air inhaled and the exhaled air in the laboratory, and the process is as follows:

Ask the question] What is the difference between the air we inhale and the air we exhale.

Hypothetical conjecture] The inhaled gas contains less carbon dioxide and water vapor; Exhaled air contains more carbon dioxide and water vapor.

Answer: (2) The lime water in the gas collection cylinder containing the exhaled gas becomes turbid, and there is no obvious phenomenon in the other bottle; There is more carbon dioxide in exhaled breath than in air;

3) The wooden strip in the gas collection bottle containing the exhaled gas is extinguished, and there is no obvious phenomenon in the other bottle; Exhaled air contains less oxygen than air;

4) Exhaled glass slice is wetter than another; There is more moisture in the exhaled air than in the air.

Comparing the difference in the carbon dioxide content of the two gases can be compared by the properties of carbon dioxide. We know that carbon dioxide can chemically react with lime water to make lime water turbid, and by doing so, we can compare the amount of carbon dioxide in the air we breathe in and the air we exhale.

Laboratory supplies. Gas collection cylinders (125 ml, 2 pcs), ground glass sheets (2 pieces), sink, rubber tip dropper, beverage tube and clarified lime water.

Experimental Procedure. 1. Collect a bottle of air sample. Take an empty gas collector cylinder and cover the cylinder with the hair side of the glass sheet downward.

2. The drainage method collects a bottle of exhaled gas.

Take an empty gas collection cylinder, fill it with water, and cover a small part of the bottle mouth with a glass piece, then push the glass piece to cover the bottle mouth completely, and put the bottle filled with water upside down in the water tank with the glass sheet.

Carefully insert the beverage tube into the middle cylinder and blow slowly into the cylinder until the bottle is filled with exhaled gas.

Immediately cover the mouth of the gas collector cylinder with a glass sheet under water, and then take out the gas collector cylinder and place it on the experimental table.

3.Compare the difference in CO2 content between the two.

A bottle of air sample and a bottle of exhaled gas sample were each dropped with the same number of drops of clarified lime water, shaken, observe the phenomenon and record.

Precautions. During the experiment, you should abide by the experimental rules, pay attention to safety, and clean up the used equipment after the experiment.

Through experiments, the operation method of collecting the exhaled air exhaled by the human body by draining gas collection method was demonstrated. It was confirmed that the oxygen content of the exhaled air was lower than that of the air; It was confirmed that the amount of carbon dioxide in the exhaled air was higher than the amount of carbon dioxide in the air. Verify that the exhaled breath contains more water vapor than the air.