Chemical knowledge

Salty flavor, commonly used seasoning, pickled fish, eggs and vegetables, the most widely used spice, is called "the king of all flavors". One of the reasons why people eat a certain amount of salt every day (6 g 15g salt is usually enough for adults to eat) is that the body needs functions. Na+ is an important part of maintaining osmotic pressure and volume of extracellular fluid, which mainly exists in extracellular fluid. The concentration of salt in animals' blood is constant, and too much salt or supplementary loss is not enough to increase excitability, so weakness and trembling occur, which eventually leads to paralysis of animals' hind limbs and death. American scientist Taylor experienced that in the initial process of eating salt-free food, sweating increased and appetite disappeared. After five days, you felt very tired, and you felt muscle pain and stiffness. After 9 days, and then insomnia and muscle twitching, the experiment was forced to stop because of the serious situation. Of course, if you eat too much salt, you will absorb water from cells, and your body will get hot because of lack of water.

In the process, the nitrogen content in the air is a compound of nitrogen, which can be absorbed by plants and is called nitrogen fixation. There are usually two types of fixed nitrogen in nature: one is unprocessed. When lightning strikes, nitric oxide and nitric oxide further combine with oxygen to generate nitrogen dioxide, which is absorbed into nitric acid by water. When it rains, nitrogen oxides in the air will fall to the ground. Another method of nitrogen fixation is to use plant rhizobia, which is a kind of bacteria, so that nitrogen in the air can form nodules in the roots of leguminous plants under natural conditions and transform them into nitrogen-containing compounds for plants to use. It is true that planting beans is fat, fat, and even planted for several years. "

Preserved eggs are the traditional food of our people. They are very popular because of their unique flavor, excellent taste and long shelf life. Do students know? In fact, processing eggs into preserved eggs is a complex chemical process. The compounds of gray alkali (sodium hydroxide and potassium hydroxide) infiltrated into the protein of egg yolk and egg white from eggshell 1, which led to the degradation and solidification of protein and released a small amount of hydrogen sulfide gas. At the same time, the infiltrated amino acids and protein bases further decompose, and the salt crystals and beautiful appearance condense in the egg white, just like Songhua River. The produced hydrogen sulfide gas reacts with egg yolk and egg white of various sulfide minerals, so the egg yolk, egg white and egg yolk are dark green, which is a special green tea. Salt makes preserved eggs shrink from the shell, which improves the taste and prevents corrosion. Minim increases mature eggs and promotes preserved eggs to shrink and shell. Tea tannins and aromatic oil solidify and color protein, adding flavor to preserved eggs.

Our house, the golden couple. Soak lime in water to make lime mature, and apply hydrated lime on the wall and dry it into hard white calcium carbonate covered khaki. The house is clean and bright. We must use chemically refined steel products. For the chemical treatment of oil, we can use a light plastic. Chemically calcined clay provides a beautiful tile surface for the house.

Momentum transfer in chemical reaction. Without the release of fuel combustion heat, the vehicle cannot be started. The energy chemical industry is the original energy for their actions, using electricity and unforgettable chemical energy. Nowadays, chemical transportation and tourists' life still play an important role.

Chemistry constantly appears in various activities of people's lives. Detergent phosphorus compounds are widely used in household appliances cleaning, textile, paper making, pesticides and other departments. Sulfuric acid is produced by burning iron sulfide as an important chemical raw material. Whether it is the "aqua regia" test of pure gold. Pickling scale. Gasoline emulsified rubber adhesive. Eagle stained glass hydrofluoric acid. Foam extinguisher. Pressurized carbon dioxide dissolution system is used to cool baking soda for soft drinks and delicious biscuits. Remove corrosive drugs that block the pipeline.

It is also inseparable from chemical agricultural production. As the saying goes, "chemical fertilizer is used for long beans in thunderstorm crops, even if it has been planted for several years". Lightning students study nitric oxide, which further combines with oxygen to generate nitrogen dioxide. When nitric acid falls to the ground and rains, nitrogen dioxide is absorbed by water to become a compound of nitrogen and oxygen in the air. The other is to use plant rhizobia, which is a kind of bacteria. The roots of leguminous plants can form nodules. Under natural conditions, it can form nitrogen-containing compounds in the air for use by plants. In addition, acid soil is often improved with hydrated lime.

Oxygen in chemistry and medicine is closely related to the use of sodium peroxide to react with oxygen in carbon dioxide, saving many lives. People are also suitable for making physiological saline in a scientific way to alleviate the pain of patients. In modern times, human beings have invented many new drugs to treat incurable diseases, such as penicillin. However, cancer and AIDS still make doctors helpless. I believe that our future successors will be able to solve two main problems.

Chemical raw materials, chemical knowledge is obvious, the words on the plastic bags we usually use are mostly marked "02", if it. Chemical reaction of polyethylene in "02" code. Marked PVC, chemical? Generally speaking, the PVC inlet pipe will drop, and this material is usually used as the insulation layer of the wire. We may be surprised! Wood is also used to make clothes. As we all know, it is rich in cellulose, wood, sulfurous acid, caustic soda, cooking and bleaching after wood hydrolysis. With the development of science and technology, white cellulose and lignin in wood are removed, then made into pulp, then sent to be used as raw materials for optical fiber equipment, and then made into sticky mucus from sulfonated caustic soda and carbon disulfide "dissolved cellulose sulfene lye", and finally become a new chemical material that is increasingly common in life after spinning and textile fabrics. For example, PTFE won't stick to polyvinyl alcohol, polyethylene oxide (PEO) and other super absorbent diapers ... I don't want to make an analysis here.

It plays an important role in some important fields such as science, chemistry, fuel for rocket launch, etc., that is, the principle of using hydroxide to boil water, but cruel people once again went to war, Japanese imperialist chemicals and inhuman chemical experiments. Modern humans have taken measures, such as prohibiting the use of nuclear weapons.

Understand the chemical reaction, understand the life, and avoid the significant decline of cross-diseases. 14 March 1938, the spectacular steel box girder bridge crossed the Albert Canal in the cold of-15℃, and suddenly there was a loud noise, which broke into several sections and fell into a small part outside the river. The chief culprit of this accident is phosphorus in steel. Phosphorus is a harmful element, which makes steel easy to break when it is rolled and processed at room temperature. Although it can improve the hardness of steel, it significantly reduces the ductility and toughness of steel. Visible chemicals that life needs to know.

Chemical changes in people's lives have both advantages and disadvantages. Air pollution and acid rain caused by automobile exhaust warn us that ozone hole threatens our environmental chemicals and has become a major problem in people's lives. When it comes to air pollution, you will immediately think of the billowing smoke from chemical plants and steel mills and the automobile exhaust on the road, and think less about yourself. In fact, indoor air pollution can not be ignored, sometimes as much as outdoor air pollution. When the kitchen burns natural gas and coal, it often emits a lot of carbon dioxide and sulfur dioxide as pollution sources. If sulfur dioxide is not tight indoors, it will corrode the homepage of Metal Products Co., Ltd., and more importantly, it will be harmful to human health. As long as the concentration of sulfur dioxide in the air exceeds eight ten thousandths, people will feel uncomfortable. It can contract trachea and cause chronic bronchitis and bronchitis. Blood inhaled with carbon dioxide combines with B vitamins and vitamin C through alveoli. This imbalance affects the beginning of body metabolism. In addition, coal-burning stoves are also keen on carcinogens-3,4 benzopyrene, which smokes when cooking. In addition, oil and natural gas are abundant, and some harmful substances such as aldehydes, alcohols and esters can also be released from walls and floors.

The chemical substance itself. A magical mirror, combined with more than 100 elements, constitutes the magic and beauty of the world. This is the difference between beautiful and noble diamonds and graphite and soft and cheap forms of carbon that open the world. It is a joke for those who will continue to explore the progress of his jokes. Our life has entered a better future. We study scientific and cultural knowledge only to improve human life. Maybe in the future, chemicals will have some advantages and disadvantages. As long as we pay attention to observation, the development of more chemicals will be greatly developed, and the mystery of our life will be further discovered. Life will be more convenient, more comfortable and more attentive. Life itself is a chemistry book.