Endothermic compound

Endothermic compounds, formed as the energy-rich products of endothermic reactions, are thermodynamically unstable and may be liable to energetic decomposition with low energy of activation. 

A moderately endothermic compound (AH°f (1) +53.1 kJ/mol, 1.29 kJ/g) which, though reactive, does not exhibit inherent instability under normal conditions. 

Though a moderately endothermic compound (AH°f +70.8 kJ/mol), its high MW gives it the rather low specific energy content of 0.18 kJ/g. 

Propargyl bromide is an endothermic compound. It detonates on impact or when it is heated. When 70-80% of it is present in a solution with toluene It becomes insensitive to impact. 

See other endothermic compounds, metal azides, silver compounds 0024. Silver trisulfurpentanitridate 

See Other ENDOTHERMIC COMPOUNDS, METAL CYANIDES, SILVER COMPOUNDS 

See other ENDOTHERMIC COMPOUNDS, METAL FULMINATES, SILVER COMPOUNDS 

See other cyano compounds endothermic compounds, organic acids 

See related cyano compounds See other ENDOTHERMIC COMPOUNDS 

See other alkylmetals, endothermic compounds, mercury compounds 

Explosions occurred dining distillation of this polynitro compound [1]. Though not an endothermic compound, it is of positive oxygen balance and the heat of decomposition (2.80 kJ/g) would give an adiabatic decomposition temperature exceeding 2200°C and a 40-fold increase in pressure [2], 

The tetroxide, which forms an equilibrium with nitrogen dioxide, is a very strong oxidant and an endothermic compound. To analyse all the dangerous reactions of 

These values indicate a rapid fall in thermal stability of the halide from fluorine to iodine, and hydrogen iodide is an endothermic compound. If we now examine the various enthalpy changes involved. we find the following values (in kJ)  

Test suspect materials for undesired properties, (e.g., endothermic compounds, compounds containing oxidizing and reducing group such as ammonium nitrate) 

At room temperature ozone is a slightly blue diamagnetie gas which condenses to a deep blue liquid. It has a characteristic smell, and is toxic. Ozone is a very endothermic compound  

Most chemical reactions are exothermic. In the few endothermic reactions that are known, heat is absorbed into the reaction product or products, which are known as endothermic or energy-rich compounds. Such compounds are thermodynamically unstable because heat woiild be released on decomposition of their elements. The majority of endothermic compounds possess a tendency toward insta-bihty and possibly explosive decomposition under various circumstances of initiation. 

On exposure to air, dimethylcadmium peroxide is formed as a crust [1] which explodes on friction [2], Ignition of dimethylcadmium may occur if a large area volume ratio is involved, as when it is dripped onto filter paper [3], It is a mildly endothermic compound (AH°f (1) +67.8 kJ/mol, 0.47 kJ/g). 

An endothermic compound, which is hardiy stable thermodynamically. However, it only decomposes under extreme conditions (very violent shock, high temperature). When it is involved in a reaction, this compound can combust or detonate easily because of the exothermicity of the transformation. Since it is hardly ever handled in the pure state (it forms when compounds containing arsenic are handled) it gives rise to a limited number of accidents. 

Besides the weak bonds listed in the previous table, there are other multiple bonds that endow the molecules in which they are situated with a positive enthalpy of formation. Such compounds are termed endothermic compounds. The danger they represent does not necessarily come from the fact that they are unstable, but is related to the exothermicity of their decomposition reaction. The most convincing examples are the acetylenic compounds, and in particular, acetylene. It is also the case for ethylene, aromatic compounds, imines and nitriles. 

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