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Basic knowledge of calcium nitride

Introduction of Calcium Nitride
Ca3N2, the full name of calcium nitride, is a reddish brown crystalline solid composed of calcium and nitrogen. The appearance is reddish brown. Calcium nitride will decompose in contact with water to form calcium hydroxide and release ammonia. Decomposes dilute acid and decomposes in alcohol . Calcium nitride is an ionic compound, so by evaluating its constituent ions, we can determine its molecular formula. Calcium ions are 2+ ions or Ca2+. The nitride ion is 3-ion or N3-. Therefore, in order to balance the molecular weight, 3x calcium ions, namely Ca3N2, are required for every 2x nitride ions.
What is the difference between calcium atom and calcium ion?

The calcium atom is neutral. The most obvious is that calcium atoms have high chemical reactivity, they can easily lose two electrons to form ions. Calcium ions are electrically stable and react with negative ions to form ionic compounds.
Are calcium ions larger than calcium atoms?
Calcium atoms are larger than calcium ions. Because the parent atom is always larger than its cation, because the effectiveness of the nuclear charge increases due to fewer electrons.

Is Nitrogen Nitrogen?
Chemically, nitride is a compound of nitrogen, in which the formal oxidation state of nitrogen is -3. Nitride is a class of compounds with a wide range of properties and applications. The nitrogen ion N3- has never been encountered in the proton solution because it is so alkaline that it can be protonated immediately.

Application of Calcium Nitride
1. Chemical reagents
2. Hydrogen storage materials
3. The main raw materials of high-end phosphors.

What is a hydrogen storage material
Hydrogen storage materials are a kind of materials that can reversibly absorb and release hydrogen. The earliest discovery was metallic palladium. One volume of palladium can dissolve hundreds of volumes of hydrogen, but palladium is very expensive and lacks practical value. As a green energy and energy carrier with abundant reserves, wide sources, and high energy density, hydrogen energy is attracting widespread attention. The use of hydrogen energy needs to solve the following three problems: hydrogen production, storage, transportation and application, and the storage and transportation of hydrogen energy is the key to the application of hydrogen energy. Hydrogen exists in gaseous form under normal conditions, and is flammable, explosive, and easy to diffuse, so that people should give priority to the safety, high efficiency and no leakage loss in hydrogen storage and transportation in practical applications, which gives storage and transportation belts. It's very difficult.

Basic methods for fighting fires with wet and flammable materials
Water and water-containing fire extinguishing agents must not be used when wet and flammable items catch fire. Non-aqueous fire extinguishing agents such as carbon dioxide, nitrogen, and halogenated alkanes are also unavailable. Because most of the flammable materials in contact with moisture are alkali metals, alkaline earth metals and their compounds, they are not only flammable in contact with water, but also generate quite high temperatures during combustion. At high temperatures, most of these substances can interact with carbon dioxide. , Haloalkane reacts, so it can not be used to extinguish fires exposed to wet and flammable products.
For example, if carbon tetrachloride is in contact with burning sodium, it will immediately generate a cloud of carbon, which makes the combustion more violent; nitrogen is non-flammable, non-toxic, and does not contain water. It should be said that it can be used to put out fires when wet and flammable. , But because nitrogen can directly compound with metallic lithium to generate lithium nitride, nitrogen and metallic calcium can generate calcium nitride at 500℃, and it cannot be used. According to the current research results, the best fire extinguishing agent for flammable materials when wet It is trimethyl metaborate, and it can also be used with dry sand, loess, dry powder, stone powder: it is also very effective to use dry salt-alkali noodles, graphite iron powder, etc. against metal potassium and sodium fires.
But pay attention to when metal lithium is on fire, if dry sand containing SiO2 is used to extinguish the fire, the combustion product Li2O can react with SiO2; if sodium carbonate or table salt is used to extinguish the fire, the high temperature of its combustion can separate sodium carbonate and sodium chloride to liberate more than lithium The more dangerous sodium. Therefore, if lithium metal catches fire, sand, dry sodium carbonate powder and salt should not be used to extinguish the fire. In addition, because metal cesium can react with graphite to produce cesium carbide, it cannot be extinguished with graphite when cesium metal catches fire.

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