Carbon dioxide is rich in nature and is a part of the atmosphere, accounting for about 0.03%. It is mainly produced by the combustion of carbonaceous materials and animal metabolism. Some associated gases of natural gas or oil fields and carbonate-formed ores also contain carbon dioxide.
Carbon dioxide can't burn or help combustion, so it is often used in fire extinguishers. Carbon dioxide can react with water to produce carbonic acid, which is used to produce soda water and carbonated drinks. Carbon dioxide reacts with alkaline solution to produce carbonate. In the laboratory, the existence of carbon dioxide is often tested by clarifying whether lime water becomes turbid with alkaline solution. Because of the above properties, carbon dioxide is widely used in chemical production, gas fertilizer, fire fighting, beverage making and so on.
Extended data:
Generally speaking, the content of carbon dioxide in the atmosphere changes slightly with the seasons. This is mainly due to the seasonal changes of plant growth. When spring and summer come, plants consume more carbon dioxide because of photosynthesis, and its content decreases accordingly; On the contrary, when autumn and winter come, the photosynthesis of plants is less, the consumption of carbon dioxide is reduced, and its content is increased.
Solid carbon dioxide is also called dry ice. When dry ice sublimes, it can absorb the surrounding heat and condense the surrounding water vapor, resulting in a misty scene, while the surrounding temperature drops rapidly. Therefore, dry ice is often used to preserve goods at low temperature, and it is also widely used in health, industry, catering, artificial rainfall, stage effect and so on.