Who was the first to start monitoring carbon dioxide concentrations?

Liu Zijian originated as a scientist in Beijing in 1996.

So far, carbon dioxide.

The concentration in the atmosphere is about ().

a.Four percent.

b.Four thousandths.

c.Four ten-thousandths.

d.Four parts per 100,000.

Answer analysis: c

Note: Carbon dioxide is a colorless, tasteless, and odorless gas at room temperature. The chemical formula is co, formula amount, one of carbon oxides, commonly known as carbon dioxide gas.

Also known as carbonic anhydride.

or carbohydride. At room temperature, it is a colorless and odorless gas, slightly denser than air, soluble in water (1 volume Ho can dissolve 1 volume CO), and produces carbonic acid.

Solid carbon dioxide is commonly known as dry ice.

It can absorb a lot of heat during sublimation, so it is used as a refrigerant, such as artificial rainfall, and is also often used in stage art to create smoke (dry ice sublimation absorbs heat, and liquidates water vapor in the air).

So far, the concentration of carbon dioxide in the atmosphere is about ().

a.Four percent.

b.There are no friends in a thousand.

c.Four ten-thousandths.

d.Four out of 100,000.

Correct Answer: c

Abnormal end-tidal carbon dioxide monitoring values can be influenced by several factors:

1.Respiratory rate and depth: Changes in respiratory rate and depth affect the amount of exhaled carbon dioxide and thus end-tidal carbon dioxide monitoring values.

2.Cardiac output: changes in cardiac output affect alveolar ventilation, which affects exhaled carbon dioxide and thus end-tidal carbon dioxide monitoring.

3.Lung function: changes in lung function affect alveolar ventilation and alveolar perfusion, which in turn affects the amount of exhaled carbon dioxide and thus end-tidal carbon dioxide monitoring.

4.Metabolic rate: Changes in metabolic rate affect the amount of carbon dioxide produced by tissues, which in turn affects the amount of carbon dioxide exhaled, which in turn affects end-tidal carbon dioxide monitoring values.

5.Ventilator settings: Improper ventilator settings may also lead to abnormal end-tidal carbon dioxide monitoring values, such as ventilator ventilation, respiratory rate, and positive end-expiratory pressure levels.

6.Respiratory diseases: Respiratory diseases, such as lung infections and emphysema, may also cause abnormal end-tidal carbon dioxide monitoring values.

Therefore, when performing end-tidal carbon dioxide monitoring, it is necessary to comprehensively consider the above factors in order to correctly interpret the monitoring results.

Problem Solving Ideas: When collecting gas, it is necessary to consider not only the density and water solubility of the gas, but also whether the gas is toxic

a. CO is toxic, so it cannot be collected by air exhaust method, so the statement is wrong;

b. CO2 can be dissolved in water, so it cannot be collected by drainage, so it is wrong;

c. CO2 can be soluble in water, so it cannot be collected by drainage, and the density of carbon dioxide is higher than that of air, so it can be collected by upward air exhaust method; CO is toxic, so it cannot be collected by air exhaust method, and carbon monoxide is insoluble in water and can be collected by drainage.

d. From the above analysis, it can be seen that this option is incorrect;

Therefore, C 5 is chosen, and the following statements about the methods of carbon dioxide and carbon monoxide collection are correct ( ).

a Both can use the upward exhaust method.

b Drainage can be used.

c Carbon dioxide can only be used by the upward air exhaust method, carbon monoxide can only be used by the drainage gas collection methodd Carbon dioxide can only be used by the upward air exhaust method, and carbon monoxide can only be used by the downward air exhaust method.

The gas mixture is 100 grams, of which two large carbon oxides are in Gyeongdong.

The mass is x grams and the CO is y grams.

then carbon element. The mass is 36 grams.

x+y=100

12x/44 + 12y/28 ==36

Solve x and you're good to go. x = 44 grams.

Therefore, the mass fraction of CO2 is 44%.

a. As the population grows, respiration exhales a large amount of carbon dioxide, so it will increase the content of carbon dioxide in the atmosphere; Therefore, it does not fit the topic

b. The rapid increase in human energy consumption and the destruction of forests have increased the amount of carbon dioxide produced from the source of carbon dioxide, so the sharp decline of forests and the weakening of photosynthesis are also the main reasons for the increase in carbon dioxide content, so they do not meet the topic

c. Carbon dioxide is the main gas that causes the greenhouse effect, mainly from the large use of fossil fuels In order to reduce the emission of greenhouse gases, it is necessary to develop new energy It is not the greenhouse effect that increases the carbon dioxide content, so it is in line with the topic

d. The main product of combustion is carbon dioxide, so the use of fuel by human beings will increase the content of carbon dioxide in the atmosphere, so it does not meet the topic

Therefore, c

ab carbon dioxide gas passes into the purple litmus test solution, and the solution turns blue (red) c Quickly prepare a large amount of carbon dioxide with lumpy limestone and dilute sulfuric acid Use dilute hydrochloric acid You can't use dilute sulfuric acid d The burning wooden strip stretches into the gas collection cylinder, and the flame is immediately extinguished, proving that the original gas in the bottle is carbon dioxide, which can only be used to verify that it is CO2 answer a

Here's how I will tell my students:

a。Dry ice is solid carbon dioxide, which sublimates at room temperature and absorbs heat, so that the water vapor in the air condenses into small water droplets, so it can be used for artificial rainfall.

b。Carbon dioxide passes into the litmus reagent and undergoes a chemical reaction with the solvent water in the reagent, that is, CO2 + H2O = H2CO3, and the generated H2CO3 is called carbonic acid, carbonic acid is an acid, and the acid solution can make the purple litmus reagent turn red, so the answer to B is wrong in this sentence, but your question is the test, preparation and use of carbon dioxide, this sentence is neither testing, preparation nor use, so it is also wrong.

c。The rapid preparation of a large amount of carbon dioxide can be prepared by the reaction of limestone and dilute sulfuric acid, but the limestone is required to be a powder, so as to increase the contact area of the reactants, in order to achieve the rapid preparation of a large amount of carbon dioxide, and C is used in the block limestone, and the reaction with dilute sulfuric acid will grow calcium sulfate, water and carbon dioxide gas, calcium sulfate is a substance with very little solubility, that is to say, calcium sulfate is a slightly soluble substance, a large amount of limestone surface will be covered on the surface of limestone, This prevents the calcium carbonate in the limestone from continuing to react with dilute sulfuric acid to produce large amounts of carbon dioxide. So C is wrong.

d。This option is about the test of carbon dioxide, and in secondary school, only clear lime water can be used to test carbon dioxide, and if the lime water becomes turbid, it means that the gas is carbon dioxide. The gas that can make the burning wooden stick extinguish immediately, and the nitrogen gas we learned in middle school.

Hope it helps!

: CO2 dissolves in water to form carbonic acid, which turns litmus red.

C: The generated CaSO4 is slightly soluble in water and covers the surface to prevent the reaction from proceeding D: For example, this bottle is nitrogen, which does not support combustion. There are other possibilities that a is due to dry ice sublimation endothermy and the rapid liquefaction of surrounding water vapor.

aa Dry ice is solid carbon dioxide, sublimation and heat absorption, to achieve the purpose of rainfall b The solution turns blue because carbon dioxide meets water to produce carbonic acid, and carbonic acid makes the purple litmus solution blue, not carbon dioxide, and carbon dioxide cannot make the purple litmus solution blue.

c The calcium sulfate produced by the reaction of calcium carbonate and dilute sulfuric acid is slightly soluble in water, and covering the surface of calcium carbonate will prevent the reaction, so dilute hydrochloric acid is used.

d May be any gas that cannot be burned and does not support combustion, not necessarily carbon dioxide.

According to reports, starting from the 24th of this month, China's global carbon dioxide monitoring scientific experiment satellite (hereinafter referred to as "carbon satellite") data was officially opened to the outside world to share, according to the China Meteorological Administration satellite experts, this carbon satellite independently developed by China was launched on December 22, 2016, and is currently running well in orbit.

At present, the international capacity for continuous monitoring and analysis of key factors affecting climate change, such as carbon dioxide, is still relatively weak, and complete basic data has not yet been formed. Accurate monitoring of global carbon dioxide emissions has become an urgent need for effective climate change research and response.

Experts said that through the analysis of continuous observation data of carbon satellites, it will effectively improve the theoretical understanding of the global carbon cycle process and provide a basis for actively and effectively responding to climate change.