1% 2C3, dioxy, color and odor. 5 That is, cyanide, poison. The use of dioxy. First, in the matter of photosynthesis, plants absorb dioxy, use light energy to photosynthesize, make materials, and release oxygen, which is very important for the balance of life on the earth. Second, in the work, it can be used for cooling, because its three-phase temperature is suitable, it can be kept solid or liquid under specific conditions, so as to reduce the temperature. Third, food production, often with solid dioxy, that is, dry ice, for refrigeration, dry ice to absorb, can maintain low environmental protection, and benefit food protection.
As for cyanide, its main use is in the field of engineering, which can be used to make nitrile compounds. Nitrile is the raw material for the synthesis of important chemical products such as rubber, plastics, and rubber. In metallurgy, it can be used to extract gold, gold, etc., cyanide can be used to form gold and rubber complexes, so it can be extracted from stone. However, it should be noted that cyanide poisoning, inhalation and food can cause death. If used, it must be operated according to the safety procedures.

The physical properties of 1% 2C3 + - + dioxy + - + 5 + - + alkynes are as follows:
1. ** State **: When the number of carbon atoms in the alkyne molecule is less than or equal to 4, it is usually gaseous; as the number of carbon atoms increases, it gradually becomes liquid and solid. For relatively complex structures such as 1,3-dioxy-5-alkynes, if there is no special group that significantly affects the boiling point, it is expected that they may be liquid at room temperature and pressure. Due to the growth of carbon chains in the molecule and the existence of cyclic and unsaturated bonds, the intermolecular force is stronger than that of simple small molecule alkynes, and the boiling point may be higher than that of straight-chain alkynes with the same carbon number.
2. ** Boiling point **: The boiling point of alkynes generally increases with the increase of relative molecular weight. There are two oxygen atoms in the molecule of 1,3-dioxy-5-alkynine, which can form a certain degree of intermolecular hydrogen bonds or increase molecular polarity, so that the intermolecular force increases, and the boiling point is higher than that of alkynes with similar structure but no oxygen atoms. The specific boiling point value needs to be determined by precise experiments, but it can be speculated that the boiling point of alkynes is significantly higher than that of simple alkynes.
3. ** Melting point **: The melting point is also related to the intermolecular force and the degree of molecular arrangement. The presence of oxygen atoms and unsaturated bonds in the molecular structure of 1,3-dioxy-5-alkynine will change the molecular shape and electron cloud distribution, affecting the intermolecular arrangement. If the molecules can be more closely arranged, the melting point will increase; otherwise, it will decrease. Due to the complexity of the structure, the exact melting point needs to be determined experimentally, but from the structure, it may be higher than that of simple linear alkynes.
4. ** Density **: The density of alkynes is generally less than that of water. 1,3-dioxy-5-alkynes contain relatively heavy oxygen atoms, and the cyclic structure makes the molecule compact, and their density may be slightly higher than that of simple alkynes. However, in general, if there are no special heavy atoms or groups, the density is still less than that of water, and it is estimated that the density is in the range of less than 1 g/cm ³, depending on the experimental determination.
5. ** Solubility **: alkynes are insoluble in water, easily soluble in organic solvents, such as benzene, carbon tetrachloride, etc. 1,3-dioxy-5-alkyne contains non-polar carbon-carbon triple bonds and carbon-hydrogen single bond regions, and oxygen atoms exist at the same time. Although oxygen atoms have a certain polarity, the non-polar part of the whole molecule accounts for a large proportion, so it is still insoluble in water. In organic solvents, due to the principle of similar miscibility, the substance is easily soluble in non-polar or weakly polar organic solvents.

1% 2C3 + - + dioxy + - + 5 + - + alkynitrile, its chemical properties are quite stable. These four substances each have their own characteristics, but they are combined and viewed, and the stability is obvious.
1, its properties are peaceful, and it is often used as a stable base in various chemical reactions, and it is not easy to change. Although it encounters strong agents, it is difficult to maximize them, and most of them exist in the reaction system in their original form.
2 bis oxide, with exquisite structure and stable bonding in the inner and middle. The outer electron distribution is orderly, making it difficult for foreign objects to break its structure. When encountering common acids and bases, they can maintain their original state and do not easily combine with them, so the stability is good.
3, although it belongs to the organic genus, its molecular structure is dense, the carbon chain is connected in an orderly manner, and the steric resistance effect is obvious. Ordinary reagents are difficult to get close to, and even if they are heated and urged, they are difficult to change their inherent properties. Under normal circumstances, they are very stable.
5, the alkynitrile is also. The combination of carbon-carbon triple bonds and cyanide groups makes the molecular energy in a low state. Both of them have high stability, and the combination of the two increases their stability. To make the reaction, strong elements, such as high temperature, high pressure and special catalysis, are required, otherwise their properties are difficult to change.
In summary, 1% 2C3 + - + dioxygen + - + 5 + - + alkynitrile and the like are chemically stable. Under normal circumstances, they can maintain their inherent state and are not prone to chemical changes.

1% 2C3 is the method of making two alum, 5 is the art of making glauberite, and the process is exquisite, let me go into detail.
The method of making two alum, first take the appropriate raw materials and mix them in a specific ratio. The selection of materials needs to be fine, and the ratio must be accurate. This is the basis. Then put it in a special furnace tripod and boil it slowly. Control of the heat is extremely critical. If the fire is fierce, the material will be burnt, and if the fire is small, it will not be effective. When boiling, you need a special person to guard it, observe its color, smell its gas, and observe its state. Only when it shows a specific color, emits a specific gas, and reaches a specific state can it be properly boiled. After that, through the process of cooling and precipitation, impurities are removed to make the quality of the two alum purer.
The art of making mirabilite also has its own unique features. Prepare the corresponding things first, and after careful treatment, put them into a large kettle. Add an appropriate amount of water and cook it over a moderate fire. When cooking, stir constantly to make the thing evenly heated. Watch its changes, adjust the heat and water volume in a timely manner. When the kettle is in an appropriate state, pour it into a shallow pool. After drying in the sun, the water gradually evaporates, and mirabilite gradually crystallizes and precipitates. During this period, it is necessary to prevent wind and rain to protect its crystallization process. And it needs to be inspected every day. If any impurities are mixed in, clean it up in time to ensure the purity of mirabilite.
All this craftsmanship requires craftsmen to be attentive, familiar with its principles, and skilled in its techniques in order to produce high-quality two-part alum and mirabilite for the needs of all parties.

In the storage and transportation of mercury, there are many things to pay attention to. Mercury, commonly known as mercury, is the only metal that is liquid at room temperature. It has special physical and chemical properties, so it must be handled with caution when storing and transporting.
When it comes to storage, the first thing is to choose a suitable container. Because mercury can erode some metals, such as aluminum, storage containers should be made of materials such as thick-walled glass, ceramics, or specific metals (such as iron containers, which can be used as storage containers because they react with mercury to form amalgam at a relatively slow rate). Containers should be well sealed to prevent mercury volatilization. The volatilization of mercury produces mercury vapor, which is a highly toxic substance. If inadvertently inhaled, it can cause serious damage to the human nervous system, kidneys, etc. At the same time, the storage environment should be kept cool, dry and well ventilated, avoid direct sunlight and high temperature environment, because the temperature will accelerate the evaporation of mercury.
As for transportation, when transporting mercury, it is necessary to ensure that the packaging is firm. Mercury should be placed in a special airtight container, and then put into a sturdy outer packing box. The box is filled with shock-absorbing and buffer materials to prevent the container from being damaged due to vibration and collision during transportation, resulting in mercury leakage. Transportation personnel must undergo professional training and be familiar with the characteristics of mercury and emergency treatment methods for leakage. Once a mercury leak occurs during transportation, the surrounding personnel should be evacuated immediately and emergency measures should be taken quickly, such as sprinkling sulfur powder, because mercury and sulfur can react quickly to form mercury sulfide, thereby reducing the volatilization of mercury, and then properly collect and clean up the leaked mercury.
The storage and transportation of mercury is related to human health and environmental safety, and must not be taken lightly. It is necessary to strictly follow relevant norms and requirements and operate with caution.