5-chlorothiophene-2-carbaldehyde

Alkanes are a class of hydrocarbons. Their molecules are composed of only two elements, carbon (C) and hydrogen (H), and the carbon and carbon are connected by a single bond, forming a chain structure. As for ethane, as a member of the alkane family, it has the following chemical properties:
First, it is quite stable. Under normal temperature and pressure, ethane is quite stable, and generally does not react with strong acids (such as sulfuric acid, hydrochloric acid), strong bases (such as sodium hydroxide, potassium hydroxide), and strong oxidants (such as potassium permanganate). This is because the carbon-carbon single bond is relatively strong and difficult to break.
Second, a substitution reaction can occur. When ethane and chlorine are under light conditions, chlorine atoms will gradually replace hydrogen atoms in ethane molecules. For example, when ethane reacts with chlorine when illuminated, monochloroethane and hydrogen chloride are first formed. The reaction equation is:\ (CH_ {3} CH_ {3} + Cl_ {2}\ xrightarrow {light} CH_ {3} CH_ {2} Cl + HCl\). If chlorine is sufficient, monochloroethane will continue to react with chlorine to form various chloroethanes such as dichloroethane and trichloroethane.
Third, it can carry out oxidation reactions. Ethane can burn in air, emitting a light blue flame, generating carbon dioxide and water, and releasing a large amount of heat at the same time. This is a common oxidation reaction. Its chemical equation is:\ (2CH_ {3} CH_ {3} + 7O_ {2}\ xrightarrow {ignited} 4CO_ {2} + 6H_ {2} O\). It is because ethane combustion can release a lot of heat energy, so it is often used as a fuel.
In summary, ethane has good stability and can undergo substitution reactions and oxidation reactions under specific conditions. These properties make it have important uses in organic synthesis and energy fields.

This is a common method for making ethylene in Ru Yan.
First, ethanol dehydration method. Under the condition of concentrated sulfuric acid catalysis and heating to 170 degrees Celsius, ethanol can undergo intramolecular dehydration to obtain ethylene. The chemical formula is: $CH_ {3} CH_ {2} OH\ xrightarrow [170 ^ {\ circ} C] {concentrated sulfuric acid} CH_ {2} = CH_ {2}\ uparrow + H_ {2} O $. Among them, concentrated sulfuric acid is the dehydrating agent and catalyst. When operating, pay attention to precise temperature control, because if the temperature is 140 degrees Celsius, ethanol will undergo intermolecular dehydration to form ether.
Second, halogenated hydrocarbon elimination method. Taking bromoethane as an example, it is co-heated with the alcohol solution of the strong base, and the elimination reaction can occur to obtain ethylene. The formula is: $CH_ {3} CH_ {2} Br + NaOH\ xrightarrow [\ Delta] {alcohol} CH_ {2} = CH_ {2}\ uparrow + NaBr + H_ {2} O $. In this reaction, alcohol acts as a solvent to promote the smooth progress of the reaction, while the strong base grabs the hydrogen atom on the adjacent carbon of the halogen atom in the halogenated hydrocarbon, so that the halogenated hydrocarbon dehalides hydrogen to produce ethylene.
Third, petroleum cracking. Oil cracking is deep cracking, which breaks hydrocarbons with more carbon atoms into small molecular hydrocarbons such as ethylene and propylene. Hydrocarbons in petroleum at high temperature (700-1000 ℃), carbon-carbon bonds and carbon-hydrogen bonds in the molecules break and rearrange to produce ethylene. This is an important way for industrial large-scale production of ethylene. Due to the rich petroleum resources, a large amount of ethylene can be obtained by this method to meet the many needs of chemical production.

Those who are mercurial, spiritual things, are useful in all domains. As for the orchid mite, it is also useful in many places.
Looking at the mountain forest, the orchid mite hides in the humus of fallen leaves. The leaves of the forest fall and accumulate on the surface, gradually forming humus. The orchid mite is here, specializing in decomposition. Although its body is small, it has a large role. It can refine humus and return it to the natural cycle, help soil fertilize and nurture forest growth.
In the wetlands, where the water is filled and the vegetation is lush. Orchid mites shuttle through it, not only participating in the decomposition of plant residues, but also improving the soil structure of wetlands. The ecology of wetlands is more balanced due to the work of orchid mites, and aquatic and terrestrial creatures depend on it.
Furthermore, the land of farmland is related to people's livelihood. Although orchid mites are not as well known as common agricultural things, they do a great job in soil ecology. It can loosen the soil, make air and water more accessible, and facilitate the extension of crop roots. And decompose the organic waste in the soil, release nutrients for crops to absorb, and help the five grains to harvest.
Mercury is not the only harm. In the art of alchemy, the ancients used it as an essential material for alchemy, hoping for medicine for longevity. Although there are many imperfections in this way, it was also an exploration at that time. In medicine, mercury and its compounds were used in some medicines in the past to treat scabies and various diseases. However, its nature is toxic, and it is used with caution today. In the field of industry, mercury used to be an important material in electrical appliance manufacturing, etc., because of its electrical conductivity and special physical properties.
To sum up, orchid mites silently perform their duties in mountains, wetlands, farmland, and many other fields to maintain ecological stability; although mercury is toxic, it has its own uses in the past or present in medicine, medicine, and industry.

In today's world, business conditions change, and it is not easy to know the price of propane in the market. The price of cobalt is subject to many reasons, and it is difficult to generalize.
The first to bear the brunt is the change of seasons. Spring, summer, autumn and winter, the four seasons change, and the product is rich and different. In spring and summer, the output of plumbing fish fertilizer and propane is high, and the supply in the city is sufficient, and the price may become flat; in autumn and winter, the water temperature gradually cools, the growth of propane is slow, the catch is reduced, and the circulation in the market is scarce, and the price may rise.
Furthermore, the difference in regions also has a great impact. The water and soil in the four directions are different, and the price of propane from the origin and non-origin is far from the same. The place of origin, because it is close to the water tower, it is convenient to get fish, the cost is slightly lower, so the price is also cheap; instead of the place of origin, the mollusk is supplied by foreign transportation, and the freight and loss on the way are all increased, and the price is high.
There is also a market supply and demand. If everyone likes mollusk, and there are many people who want it, but the supply is limited, the so-called "rare is expensive", its price will rise; on the contrary, if everyone is not interested in mollusk for a while, there are few people who want it, and the supply exceeds the demand, the price will have to drop.
And the cost of breeding is also related to its price. If the price of feed, the cost of breeding sites, human resources, etc., all rise, the cost of raising mackerel will increase greatly. In order to ensure their profits, merchants will raise the price in the market; if the cost decreases, the price may also decrease.
In summary, the price of mackerel in the market changes with various factors such as regulation, region, supply and demand, and cost. If you want to know the exact price, you must carefully observe the situation at that time and place.

"Tiangong Kaiwu" says: "Mercury is a spiritual liquid, and if you get fire, you will fly. If you raise sulfur, you will become Zhu, if you raise alum, you will become powder, and if you raise mud and alum, you will become Dan sand." Mercury, that is, mercury, has special properties, and it is often necessary to keep it carefully.
Mercury is volatile and toxic, so it is the first thing to store mercury in an airtight container. It is better to use a thick porcelain bottle, because its texture is dense, it can reduce the volatilization of mercury. When sealing the bottle, make sure the mouth of the bottle is tight, and do not allow it to be breathable.
Furthermore, the place where mercury is stored should be cool and dry. If it is in a warm place, mercury is easy to dissolve gas and escape. And if the ground is humid, or causes mercury to come into contact with water vapor, causing other changes. It is advisable to choose a place that is high and open, well ventilated, and does not see light.
And do not allow mercury to be mixed with other things to prevent it from reacting with other substances. Especially avoid being close to metals such as copper and lead, because it is easy to form amalgam with mercury, causing changes in the properties of mercury.
In addition, the ancients hid mercury, often with stone gall and other substances. The stone gall has the property of convergence, which can slow down the volatilization of mercury. The stone gall is ground into powder and placed on the side of mercury, or can protect the quality of mercury.
The matter of mercury storage is related to safety and the survival of objects, and the above conditions must be followed before it can be properly stored so that the use of mercury can be sustainable for a long time.