With the development of productive forces and the progress of science and technology, chemistry is getting closer to people's lives. As we all know, everything around us is made up of many chemical elements, including many indispensable elements for our human body. Chemistry has played an inestimable role in human production and life.

Everyone knows where salt comes from, right? Modern humans have studied chemistry, and salt is inexhaustible. In the past, people didn't master the scientific method, and the dishes they often cooked didn't add salt or contained iodine, which led to "big neck disease" and so on.

In daily life, chemistry also brings a lot of convenience to human beings. Washing powder and soap are good products for household decontamination, and beer is people's favorite drink.

Put some soda in steamed bread. Steamed bread is big, white and delicious. There are many examples.

Chemistry and medicine are also closely related. The oxygen supply device uses the reaction of sodium peroxide and carbon dioxide to produce oxygen, which has saved many lives, and I am one of them. People also use scientific methods to make physiological saline to alleviate the pain of patients. In modern times, mankind has invented many new drugs and conquered incurable diseases, such as penicillin. However, cancer and AIDS still make doctors helpless. I believe that our future successors can solve these two problems.

Chemistry plays an important role in some important scientific fields. The fuel required for rocket launch is the principle of obtaining water by burning hydrogen and oxygen. However, cruel humans brought chemistry into the war, and Japanese imperialists used people to do inhuman chemical experiments. Modern humans have taken measures, such as banning the use of nuclear weapons.

Chemistry has brought changes to human life, with both advantages and disadvantages. The exhaust gas from cars has caused air pollution. Acid rain is warning us that the hole in the ozone layer threatens us, and environmental protection has become a major problem brought by chemistry to people's lives.

For the task of our generation, only by studying scientific and cultural knowledge well and improving human life, maybe chemistry will have more benefits in the future. There are fewer shortcomings.

The second article

Chemistry is a basic natural science, which is of great significance to human beings and has a great relationship with life. Chemistry can help people do useful things. Food, clothing, housing and transportation, chemistry is everywhere.

In terms of clothes, chemistry can add warmth to life. Nylon, a kind of resin with amide bond in its molecule, is not found in nature and needs to be obtained by chemical methods; Polyester, a kind of fiber synthesized from ethylene glycol and dimethyl terephthalate. There are many similar materials that enrich people's wardrobes. Chemistry is equally important in food. Steamed bread made of soda dough is soft and delicious. All kinds of drinking wine are made from grain and other raw materials through a series of chemical changes. Betel nut is a favorite food of ethnic minorities. Before eating, it must be soaked in hydrated lime and cut into small pieces. It takes some time to eat.

Thanks to chemistry, our house has colorful decorations. Quicklime is soaked in water and cured lime, which is coated on the floor to become white and hard calcium carbonate, covering the yellow of the soil and making the house look neat and bright. Only when steel is chemically refined can we use iron products. Only by chemically processing petroleum can we use lightweight plastics. Chemical calcination of clay can make the house have a beautiful tile surface.

Chemical reaction is the driving force of vehicles. Without the heat released by fuel combustion, the vehicle cannot start at all. Chemical energy is the most primitive source of energy for their actions. Even with electricity as power, we can't forget the great contribution of chemical energy. At present, chemistry is still a means of transportation and plays an important role in people's travel.

Chemistry is in all kinds of activities in people's lives all the time. Detergents are phosphorus-containing compounds, which are widely used in people's cleaning appliances, textiles, papermaking, pesticides and other departments. Sulfuric acid is produced by the combustion of pyrite as an important chemical raw material. Use "aqua regia" to test the purity of gold. Remove the oxide scale by pickling. Use gasoline emulsified rubber as adhesive. Carve glass with hydrofluoric acid. Put out the fire with foam extinguisher. Dissolve under pressure with carbon dioxide to make refreshing soda, and baking soda to make delicious biscuits. Clear the pipe blockage with corrosive drugs. In life, the frequent use of chemistry is not endless, it has been closely linked with life.

Chemistry itself is a magic mirror, which skillfully combines more than 100 elements to form a magical and beautiful world. It turns elemental carbon into two different forms, beautiful and noble diamond and soft and cheap graphite, and plays a joke on people. People will keep groping for progress in his jokes. Our life will enter a bright future with its progress.

The third article

Life is rich and colorful. Inadvertently, people often encounter some perfect combination of chemistry and life. But people seldom pay attention to its subtlety and interest.

Everyone must be familiar with "salted fish". But why can fish be preserved for a long time without corrosion and deterioration with a little salt? The key is salt. The cause of food corruption is due to the action of microorganisms and bacteria. As long as the growth of biological bacteria is controlled, food spoilage can be prevented. The main component of salt is sodium chloride, which is electrolyte, and the osmotic pressure of its saturated solution is greater than that of non-electrolyte solution (protein solution in microbial and bacterial cells). When a solution with high osmotic pressure and a solution with low osmotic pressure are separated by a semi-permeable membrane (such as a cell membrane), solvent molecules will permeate from the side with low osmotic pressure to the side with high osmotic pressure. That is, in the presence of salt solution, water molecules in microbial bacterial cells will continue to enter the salt solution, leading to cell drying and death, thus playing an anti-corrosion role. Sodium chloride not only created a special case of "Immortality of the Dead Sea", but also performed well in the field of anticorrosion.

Water is the source of life, and the hardness of water has a great relationship with human health. Ca2+ and Mg2+ in high hardness water can combine with SO42-, which makes the water bitter and astringent, and also makes people's gastrointestinal function disorder, resulting in temporary waist edema, excessive exhaust and diarrhea, which is the secret of "acclimatization".

Understand chemistry and life, while avoiding the "Great Recession".

1March, 93814th, in the freezing cold of-15℃ in the Belgian city of Sirt, a grand steel bridge across the Albert Canal suddenly made a loud noise, which broke into several sections in less than a few minutes and fell into the river. The chief culprit of this accident is phosphorus in steel. Phosphorus is one of the harmful elements in steel, which can make steel brittle and easy to break when rolling at room temperature. Although it can improve the hardness of steel, it significantly reduces the plasticity and toughness of steel. It can be seen that it is necessary to understand chemistry in life.

Lifestyle is constantly changing, and the relationship between chemistry and life is getting closer and closer. Please always pay attention to your side and the connection between chemistry and life.