People have made use of chemistry to produce ,

Chemistry plays an important role in guaranteeing the survival of human beings and continuously improving the quality of life of human beings. People use chemistry to produce many medicines to protect human health; Various new materials have been developed using chemistry to improve human living conditions; Chemicals have been used to produce pesticides and fertilizers to increase food production; Utilization of chemical integrated applications (?) In order to make human life better.

1.Guarantee the survival of human beings and continuously improve the quality of life of human beings. Such as:

the use of chemicals to produce fertilizers and pesticides to increase food production; The use of chemical synthesis of drugs to inhibit bacteria and viruses to protect human health; the use of chemistry to develop new energy and new materials to improve the living conditions of human beings; The use of chemistry to comprehensively apply natural resources and protect the environment to make human life better. 2.Chemistry is a practical discipline, which, together with mathematics, physics and other disciplines, has become the foundation for the rapid development of natural sciences.

The core knowledge of chemistry has been applied to all areas of the natural sciences, and chemistry is an important pillar of the powerful force that creates and transforms nature. At present, chemists use the perspective of chemistry to observe and think about social problems, and use the knowledge of chemistry to analyze and solve social problems, such as energy problems, food problems, environmental problems, health problems, resources and sustainable development problems. 3.

The intersection and penetration of chemistry and other disciplines have given rise to many marginal disciplines, such as biochemistry, geochemistry, cosmochemistry, ocean chemistry, atmospheric chemistry, etc., which have led to the rapid development of science and technology such as biology, electronics, aerospace, laser, geology, and oceanography. 4.(The most important point, and the role shared by all scientific disciplines) is to cultivate the spirit of continuous progress, discovery, exploration, and curiosity, stimulate human desire to understand and understand nature, and enrich the spiritual world of human beings.

Nowadays, chemistry is increasingly permeating all aspects of life, especially major issues closely related to the development of human society. In short, chemistry is closely related to human clothing, food, housing, transportation, energy, information, materials, national defense, environmental protection, medicine and health, resource utilization, etc., and it is a practical discipline urgently needed by society.

Inconvenience also provides a lot

Clothing: Chemical fiber fabrics make the color and texture of clothes colorful.

Food: The use of food additives and preservatives is an increasingly diverse variety of food: the use of new materials makes housing more environmentally friendly and comfortable.

Line: The development of alloy and rubber products makes travel convenient and fast.

Use: The successive production of various materials makes the various tools we use more dexterous and lightweight.

For example; The use of solar energy will provide sufficient hydrogen energy for mankind, so that the energy crisis and environmental problems associated with chemical fuels can be alleviated.

Chemical changes are prevalent in production and life. Such as the rust of iron, the fireworks of festivals, the neutralization of acid and alkali, and so on. It can be seen that various chemical changes produce new substances, which is characteristic of chemical changes.

Physical changes are also often accompanied by luminescence (electric light), heat release (friction), gas release (opening the cap of soda bottle), color change (oxygen becomes liquid oxygen), and precipitation is generated, but no new substances are generated, which is the fundamental difference between physical change and chemical change. Some of the properties of the substance, such as color, smell, taste, whether it is easy to sublimate, volatile, etc., can be perceived by people's ears, nose, tongue, body and other senses, and some properties such as melting point, boiling point, hardness, electrical conductivity, thermal conductivity, ductility, etc., can be measured by instruments.

There are also some properties that can be calculated through laboratory data, such as solubility, density, etc. The substance did not change before or after the experiment. These properties are all physical.

For example, the tungsten filament in the bulb is a physical change when it is energized, and the heat is generated, which shows that the tungsten metal has the physical properties of being able to conduct electricity, have a high melting point, and is not easy to melt. The properties that matter exhibit when it undergoes a chemical change are called chemical properties. Involves a change in the chemical composition of a substance's molecule (or crystal).

Such as flammability, instability, acidity, alkaline, oxidation, reduction, complexation, and the phenomenon of reacting with certain substances. The chemical properties of a substance can be known by the method of causing a chemical reaction of a substance.

For example, carbon is burned in the air to produce carbon dioxide; Hydrochloric acid reacts with sodium hydroxide to produce sodium chloride and water; Heating KCLO3 to melting can rekindle the sparkled strips, indicating that KCLO3 is able to release O2 when heated to higher temperatures. Therefore, KCLO3 has the chemical property of thermal decomposition to produce O2.

It should be noted that the difference between chemical change and chemical properties is that candle burning is a chemical change; The phenomenon that a candle presents when it burns is its chemical properties.

Chemistry in human life: such as synthetic medicine to cure diseases, to ensure human health, to install catalytic converters in automobiles, to prevent automobile exhaust pollution, etc

Chemistry in production: such as the development of high-efficiency pesticides and fertilizers, to increase food production Chemistry in social development applications: such as the development of new energy to replace fossil fuels, the development of new materials, etc

Human Life: Synthetic Medicine for Disease Treatment; Production: development of high-efficiency pesticides and fertilizers; Social Development:

development of new energy, etc

(1) Plastic belongs to organic synthetic materials, and cotton and wool belong to natural organic polymer materials. b；

2) Fish and shrimp are rich in protein; Formaldehyde is harmful to the human body and cannot be used to soak seafood, so fill: protein; No;

3) a, low-carbon is to reduce the content of carbon dioxide in the air, reduce the cutting of trees can enhance the photosynthesis of green plants, so do not use disposable chopsticks in life can reduce carbon dioxide emissions, so fill in: do not use disposable chopsticks;

B. Coal contains sulfur elements to generate sulfur dioxide during combustion, which can form acid rain, so fill in SO2

(1) The concentration of carbon dioxide in the vegetable cellar that has not been opened for a long time may be relatively high, and it should be tested before entering, and the burning candle can be slowly put into the cellar

2) The use of a large amount of activated carbon to purify the water, which is the use of the adsorption of activated carbon so fill: adsorption

3) In order to prevent the occurrence of gas in small coal kilns, ventilation should be paid attention to in the coal mine and fireworks are strictly prohibited

(1) Coal gas (carbon monoxide) is burned to produce carbon dioxide, and the chemical equation of the reaction is: 2CO+O2

Ignite2co2．

2) The principle of "wet copper smelting" invented by the ancient working people is that iron reacts with copper sulfate solution to form ferrous sulfate and copper, and the chemical equation of the reaction is: Fe+CuSo4 Cu+FeSo4

3) The main component of rust is iron oxide, which reacts with hydrochloric acid to form ferric chloride and water, and the chemical equation of the reaction is: Fe2O3+6HCl=2FeCl3+3H2O

4) Calcined limestone produces calcium oxide and carbon dioxide, and the chemical equation of the reaction is: CaCO3

High temperaturescao+co2↑．

Therefore, the answer is: (1) 2CO+O2

Ignite2co2；（2）fe+cuso4═cu+feso4；（3）fe2o3+6hcl=2fecl3+3h2o；（4）caco3

High temperaturescao+co2↑．