"Carbon Dioxide in Nature" Combustion and Fuel PPT Courseware (Lesson 2)

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"Carbon Dioxide in Nature" Combustion and Fuel PPT Courseware (Lesson 2), a total of 18 pages.

1. Introduction of new courses

Carbon dioxide is a common gas. In the laboratory, we generally use _________ and _________ to prepare it.

The chemical equation for the reaction is ____________________________.

In vegetable cellars and dry wells that have not been opened for a long time, be sure to prevent the carbon dioxide content from being too high and endangering your life. When you open soda or beer, a large amount of carbon dioxide will be released. What problems do the above two life phenomena illustrate?

2. Properties of carbon dioxide

[Experimental Study 1] Light two short candles, place them on the two steps of the tin stand respectively, place the tin stand in the beaker, and slowly pour the CO2 from a gas collecting bottle into the beaker along the inner wall of the beaker ( Note: Do not remove the glass piece on the gas collecting bottle, only expose 1/3 of the bottle mouth), observe the phenomenon and analyze it.

[Experimental Investigation 2] Add about 1/2 volume of water to a soft plastic bottle filled with carbon dioxide gas, tighten the cork immediately, shake, observe and analyze the phenomenon.

Physical properties of carbon dioxide:

1. Carbon dioxide is a colorless, odorless gas.

2. Denser than air.

3. Can be dissolved in water.

Carbon dioxide is soluble in water. Under normal circumstances, 1 volume of water can dissolve approximately 1 volume of carbon dioxide. As the pressure increases, more will be dissolved. The production of carbonated drinks such as soda makes use of this property of carbon dioxide.

3. The impact of carbon dioxide on life and the environment

(1) Why do you need to do a light test before entering a vegetable palace that has not been opened for a long time or a deep dry well?

Prevent carbon dioxide concentration from being too high, causing people to suffocate due to lack of oxygen.

[Question] Why should we keep the classroom ventilated when studying in the classroom?

Carbon dioxide itself is not toxic, but when the amount of carbon dioxide in the air exceeds normal levels, it can have harmful effects on the human body. Therefore, in crowded places, attention should be paid to ventilation.

(2) What are the broad uses of carbon dioxide in life and production? What properties did each utilize?

formation of caves

The main component of limestone is CaCO3. When CaCO3 encounters water with dissolved carbon dioxide, it will slowly turn into Ca(HCO3)2 dissolved in water.

CaCO3 + H2O +CO2 = Ca(HCO3)2

When heat or pressure suddenly decreases, the calcium bicarbonate in the water will decompose and become calcium carbonate again and deposit:

Ca(HCO3)2 = CaCO3 + H2O + CO2

The above reactions continue to occur in nature. Limestone gradually turns into calcium bicarbonate and dissolves, forming a cave; calcium bicarbonate continues to decompose, and the generated calcium carbonate gradually deposits, forming various stalactites, stalagmites and stone pillars.

4. Classroom exercises

1. "Sprite" is a colorless carbonated drink. Drop a small amount of "Sprite" into purple litmus test solution and then heat it. The color change of the solution is ( )

A. The color does not change after it turns red. B. It turns red first and then purple.

C. First becomes blue and then purple D. First becomes colorless and then red

2. The operations and phenomena that can prove that a certain colorless and odorless gas is CO2 are ( )

3. Which of the following statements about carbon dioxide is correct ( )

A. Carbon dioxide is composed of one carbon atom and two oxygen atoms

B. Carbon dioxide dissolving in water is a physical change

C. Carbon dioxide can make purple litmus test solution colorless

D. Carbon dioxide is composed of carbon and oxygen

Keywords: Free download of Chemistry PPT courseware for the first volume of the ninth grade of the Lujiao Education Edition, PPT download of carbon dioxide in nature, PPT download of combustion and fuel, .PPT format;

For more information about "Combustion and Fuel Carbon Dioxide in Nature" PPT courseware, please click on the Combustion and Fuel PPT Carbon Dioxide in Nature PPT tag.

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Update Time: 2024-07-30

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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