Unfortunately, there is no chemical substance SiH8N2 in the list of common chemical substances. This could be due to the combination of the amphoteric element Silicon (Si), Hydrogen (H), and Nitrogen (N) in this formula being incorrect or not adhering to chemical rules. Molecules containing these elements usually have different structures and molecular formulas.
For instance, silane (SiH4) is a compound of silicon and hydrogen, while nitrogen often combines with hydrogen to form ammonia (NH3) or other similar compounds.
All the above information about chemical properties, physical properties, related chemical equations, and preparation processes all pertain to specific chemical substances and cannot be applied to SiH8N2 because no chemical substance with this formula exists.
Note that studying chemical substances requires accuracy and precision, as the creation or use of incorrect chemical substances can lead to undesired or dangerous results.