Quinazoline 6 Iodo

6-The cannon is Yang, and its physical properties can be studied. "Tiangong Kaiwu" has a saying: "Where cannons are cast, Western, Hongyi, Franc machines, etc. are made of cooked copper, signal cannons, short guns, etc. are made of raw cooked copper and half-made, Xiangyang, Zhankou, Great General, Second General, etc. are made of iron."
The cannon is an object, and the fire is loud, and its force can destroy the earth. In terms of material, the cooked copper is soft and pure, the cast cannon is smooth on the inner wall, and the force of gunpowder gas to push the projectile is uniform, so the projectile is shot steadily and far away, but its manufacturing cost is high and it is not durable. The raw and cooked copper is half and half, and the strength of raw copper and the softness of cooked copper are taken. The cost is slightly reduced and the performance is also good. It is suitable for flexible users such as letter guns. Cast iron cannons are rigid in iron and low in cost. They can be made into huge cannons to guard the town, but they are easy to rust, and impurities are difficult to remove during casting. If the heat is improper, the gun body is easy to crack.
Using gunpowder to push the projectile is the key to the gun. Gunpowder explodes, instantly generating high temperature and high pressure gas, and its force is rapid, causing the projectile to shoot out quickly. The shape of the gun is also related to its performance. The length of the gun bore and the size of the caliber are all exquisite. If the bore is long, the gas will act on the projectile for a long time, and the projectile has a large initial speed and a long range; if the caliber is large, it can fire larger projectiles, and the more powerful it will be.
When the cannon is fired, the fire will soar into the sky, and the sound will be like thunder. The sound of its propagation depends on the air as the medium, and can be heard from far and near. The flight of the projectile is affected by gravity and air resistance, and it takes a parabolic trajectory. This is also the manifestation of the physical properties of the cannon. On the battlefield, if it is used well, it can defeat the enemy and win, and it will

6 - What are the bright chemical properties of gunpowder?
Gunpowder is an ancient and ingenious system, and is widely used in military warfare. Its chemical properties are particularly important, related to its power and effectiveness.
First, it has strong oxidizing properties. Gunpowder contains saltpeter, the main component of saltpeter is potassium nitrate. During the combustion reaction, potassium nitrate can release a large amount of oxygen, which is used for combustion to support combustion. This characteristic makes gunpowder able to burn rapidly in a relatively closed environment. Due to the sufficient oxygen to support combustion, the reaction is very violent, which is the foundation of gunpowder deflagration.
Second, the reaction is significant. Once the gunpowder is ignited, the internal chemical substances react violently, and this reaction is an exothermic reaction. The huge amount of heat energy released in an instant causes the surrounding gas to expand rapidly. For example, in the gun chamber, the gunpowder emits a lot of heat when it is ignited, so that the generated gas obtains high heat energy in a short time, and the volume expands suddenly, which in turn generates a strong thrust, so that the projectiles are fired out, forming a winning force against the enemy.
Third, the chemical stability is good in normal times. Under normal storage conditions, the gunpowder needs to have a certain chemical stability, otherwise it is easy to react spontaneously and cause danger. In case of ignition and other excitation conditions, it can react quickly. This balance between moderate stability and excitation responsiveness ensures that the gunpowder can be safely stored in peacetime and can be used efficiently.
Fourth, the product is complex. After the combustion reaction of the gunpowder, there are many products. In addition to common gases such as carbon dioxide and nitrogen, or metal oxides. The composition and characteristics of this product are related to not only the power of the gunpowder, but also the environmental impact. If the product contains sulfur oxides, etc., or is polluted to the environment, and different products remain in the gun bore, it will also affect the subsequent use of firearms.

6 - What are the common synthesis methods for taking nitric acid? In ancient Chinese,
One of them is the catalytic oxidation of ammonia. Ammonia (\ (NH_ {3}\)) in the presence of catalysts such as - Alloy parts, the oxygen in the air will generate a reaction. The reaction equation is:\ (4NH_ {3} + 5O_ {2}\ xlongequal [\ Delta] {catalytic} 4NO + 6H_ {2} O\). The generated nitric oxide (\ (NO\)) is easily combined with oxygen and nitrogen dioxide (\ (NO_ {2}\)), and its inverse formula is\ (2NO + O_ {2} = 2NO_ {2}\). And nitrogen dioxide dissolves in water to form nitric acid (\ (HNO_ {3}\)) and nitric oxide, and the inverse equation is\ (3NO_ {2} + H_ {2} O = 2HNO_ {3} + NO\). Without repeating the above process, the nitric oxide is oxidized again and dissolved in water, which can increase the yield of nitric acid.
Second, the inverse method of sulfuric acid with saltpeter. Take saltpeter such as nitric acid (\ (KNO_ {3}\)) or nitric acid (\ (NaNO_ {3}\)), and sulfuric acid (\ (H_ {2} SO_ {4}\)). Taking nitric acid as an example, its inverse equation is\ (KNO_ {3} + H_ {2} SO_ {4} () \ xlongequal {\ Delta} KHSO_ {4} + HNO_ {3}\ uparrow\). This inverse uses high-boiling sulfuric acid to take low-boiling nitric acid, and the nitric acid escapes due to exposure. However, this method needs to pay attention to the corrosion of sulfuric acid and the control of inverse components.
Third, there is a way to synthesize. In some chemical reactions, it can be used as a by-product to generate nitric acid. For example, in a specific oxidation reaction, if the reaction contains nitrogen, in the oxidation process, the nitrogen may be reduced to nitric acid or the like. However, this method is not effective, and the amount is usually compared to the former two, more dependent on specific room synthesis or some special process.

6-Rhenium is a rare metal, and its compound hexacarbonyl rhenic acid is used in many fields. In the field of metallurgy, it can be used as an excellent alloy additive. Although "Tiangong Kaiwu" does not directly mention rhenium-related, it is based on the analogy of ancient process concepts. For example, various materials will be added to optimize metal properties when smelting iron and steelmaking. Hexacarbonyl rhenic acid is used in alloys, which can significantly improve the strength, hardness and high temperature resistance of alloys, so that alloys can still maintain stable structure and good mechanical properties in high temperature environments. It is used in the manufacture of high-end equipment such as aero engines, just like in ancient times by constantly exploring ingredients to improve the quality of weapons armor.
In the field of chemical catalysis, hex It can effectively catalyze a variety of chemical reactions, such as reactions in some key steps in organic synthesis, accelerate the reaction rate and improve the reaction yield. "Tiangong Kaiwu" mentions that many processes require precise control of processes and conditions, and the same is true for catalytic reactions. As an efficient catalyst, hexacarbonyl rhenic acid is just like ancient craftsmen accurately grasping the ratio of heat and materials, helping chemical production to be efficient and produce various high-value-added chemical products.
In the field of electronics, hexacarbonyl rhenic acid can be used to manufacture special electronic components due to its unique electrical properties. Although there was no concept of electronic components in ancient times, there are many examples of the application of material properties in "Tiangong Kaiwu". Hexacarbonyl rhenium acid is used in the manufacturing of electronic components to enhance the conductivity, stability, and other properties of components, ensuring the stable operation of electronic devices, just like the pursuit of extreme performance by ancient well-made tools.

Today's 6-% sugar square light, in the city, its scenery is particularly impressive. Watching the city around the city, this sugar square light is quite popular with everyone. Between the streets of the city, all kinds of shops have their traces.
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It is especially loved by children. Every time I see the sugar square light, my eyes shine brightly, clamoring for purchases. And parents also go along with their wishes and buy it to make their children happy.
Furthermore, sugar square light is more common during festivals. Placed on the plate and listed on the list, adding a touch of sweetness to the festival. Guests from all over the world gather to eat this sugar together, and the friendship grows between laughter and laughter.
From this perspective, 6-% sugar square light in the city is not only for the enjoyment of the stomach, but also a part of the city life. It is integrated into everyone's daily life and becomes a unique scene. The prospect of the city seems to be bright and broad, and will last in the city for a long time, bringing endless sweetness to everyone.