The reason why carbon dioxide diffuses faster than oxygen refers to:

The difference in the concentration of carbon dioxide produced in the lungs is greater than the difference in the concentration of oxygen that is transmitted inward...

There are two main reasons for the increase in carbon dioxide in recent years: the use of fossil fuels and the destruction of forest vegetation.

The causes of the increase in carbon dioxide are the emission of automobile exhaust, the combustion of fossil fuels in factories, and the combustion of fossil energy sources such as peat, coal, and oil. Due to the rapid increase in population and the rapid development of industry, the carbon dioxide produced by respiration and the combustion of coal, oil, and natural gas far exceeds the levels of the past. Deforestation has led to the creation of cities and factories on large amounts of farmland, destroying vegetation and reducing conditions for converting carbon dioxide into organic matter.

The concentration of carbon dioxide in the atmosphere has increased from 350 ppm to the current 400 ppm in the last hundred years. The corresponding reduction in oxygen is .

Meaning of the Greenhouse Effect:

The greenhouse effect refers to the thermal insulation effect formed by the lack of heat exchange between the confined space that transmits sunlight and the outside world, that is, the solar short-wave radiation can penetrate the atmosphere into the ground, and the long-wave radiation released after the ground warms is absorbed by the carbon dioxide and other substances in the atmosphere, thus producing the effect of atmospheric warming.

Carbon dioxide in the atmosphere is like a thick layer of glass, turning the earth into a big greenhouse. Without an atmosphere, the average surface temperature would drop to -23, while the actual average surface temperature would be 15, which means that the greenhouse effect increases the surface temperature38. The increase in the concentration of carbon dioxide in the atmosphere prevents the loss of heat from the earth and causes the earth to experience a perceptible increase in temperature, which is known as the "greenhouse effect".

The main reasons for the increase in carbon dioxide in recent years are as follows:

It mainly depends on two aspects:

Increase in CO2 emissions:

The large use of fossil fuels such as coal and oil has increased the carbon dioxide produced by human and animal activities.

Decrease in CO2 absorption capacity:

For example, a large number of trees are cut down, vegetation is destroyed, etc. Plants (photosynthesis) are the main absorbers of carbon dioxide.

Please click Enter a description.

What can be done to protect the environment and reduce CO2?

1. Save electricity. Be careful to turn off the lights and use energy-efficient bulbs.

The U.S. Department of Energy estimates that 400 million tonnes of carbon dioxide could be avoided by replacing traditional light bulbs with energy-efficient light bulbs. In addition to electric lights, you should also pay attention to the use of other electrical appliances, try to choose low-consumption energy-saving products, cut off or turn off the power when not using electrical appliances, and let the refrigerator be in a frost-free state.

In summer, when the weather is not very hot, it is best to use a fan or electric fan instead of an air conditioner. When using the air conditioner, don't turn the temperature down too low, around 26 will do.

2. Saving water resources. Much of the wastewater can be recycled. Water for washing face, hands, vegetables, bathing, and laundry can all be collected to wipe floors, flush toilets, water flowers, etc.

Rice washing water is a good stain remover that can be left to wash dishes and chopsticks. Oil-stained pots and plates should be wiped clean with used napkins first, which is convenient to wash and save water, and you can also use less dish soap to reduce water pollution.

3. Save paper. The recycling of paper avoids the release of biogas from landfills and reduces the cutting down of trees. According to statistics, one ton of waste paper can produce 800 kilograms of recycled paper, which can cut down 17 trees, and saving paper is to protect forest resources and protect the environment.

Fourth, reduce exhaust emissions. Traffic exhaust gas and industrial waste gas are the main domestic waste gases. We try to go out by bus or taxi, we can also ride a bicycle and try not to take a private car.

A large amount of billowing smoke from the burning of garbage in factories and the production of goods fills the city.

They should process and filter the exhaust gas before emitting it to reduce pollution. Plants can absorb carbon dioxide and then release oxygen, so we need to plant a lot of trees, especially along roads.

The body's carbon dioxide is produced by the exhaust gas produced when the cells oxidize sugar-like proteins to provide energy, and this process requires oxygen Without oxygen, the cells have no energy, and people cannot do anything.

First of all, there is carbon dioxide and oxygen in the air, and when the air enters the lungs, the capillaries in the alveoli wall exchange gases, and the exhaust gas in the blood, carbon dioxide, enters the alveoli, and oxygen enters the blood(This is the balance, otherwise people will burst like balloons).

So the exhaled air has less oxygen and more carbon dioxide.

Carbon dioxide (CO2) and oxygen (O2) are both very important gases in human life, and their proportion in the air directly affects the survival of living organisms. The diffusion rate of CO2 and O2 in the air is different, and the diffusion rate of CO2 is faster than O2, which is mainly due to several reasons.

First of all, the molecular weight of the CO2 molecule is larger, and the distance between the molecules is larger than that between the O2 molecules. The molecular weight of the CO2 molecule is 44, while the molecular weight of the O2 molecule is 32, the size and mass of the CO2 molecule is larger than that of the O2 molecule, which means that the interaction force between the CO2 molecule and the air molecule is stronger, and the distance between the molecules is larger, so the diffusion rate of the CO2 molecule is faster.

Secondly, the CO2 molecule has a high solubility. The degree of pure dissolution of CO2 molecules in water is about 20 times that of O2, which means that when CO2 molecules come into contact with water molecules, they are more easily absorbed by water molecules, resulting in faster diffusion.

Thirdly, when CO2 molecules interact with other gases, the attraction between molecules is greater than that between O2 molecules. This means that CO2 molecules interact more easily with other gas molecules, making them more likely to diffuse.

In conclusion, the large molecular weight, high solubility and strong intermolecular attraction of CO2 molecules are the main reasons for the diffusion rate of CO2 to be faster than that of O2. These properties make CO2 molecules more easily absorbed, moved, and diffused, resulting in faster diffusion of CO2 in the air. This phenomenon is very important in some occasions, such as in plant photosynthesis, plants need to absorb enough CO2 for photosynthesis, so the speed of CO2 diffusion directly affects the growth and development of plants.

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 the diffusion of dust and migratory gases), and the carbon dioxide content increases 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 emission in 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).

d Investigate the causes of increased carbon dioxide. The increase in carbon dioxide as a greenhouse gas is due to the massive burning of fossil fuels and deforestation. Therefore, choose D. ,9,The main reason for the increase in carbon dioxide in the atmosphere is ( ).

A large amount of energy from the combustion of mine residue.

Volcanic eruptions overdevelop nuclear power.

Over-deforestation a b c d Molda.

Pathways of CO2 production:

1) All organic matter (including animals and plants) can release carbon dioxide gas in the process of decomposition, fermentation, decay and deterioration.

2) Carbon dioxide gas is also released during the combustion of oil, paraffin, coal and natural gas.

3) Petroleum and coal also release carbon dioxide gas in the production of chemical products.

4) All manure and humic acid can also release carbon dioxide gas during fermentation and maturation.

5) During the breathing process, all dynamic organisms must inhale oxygen and exhale carbon dioxide gas.