Complete as seguintes equações e indique os pares de ácido 1 base 1 e ácido 2 base 2 a) HNO2 + H2O b) H2PO-4 + H30- C) C6H5 – NH3 + OH- d) CH3NH3 + H2O

Silicon nitride is difficult to produce as a bulk material it can't be heated over 1850 °C, which is  below its melting point, due to dissociation to silicon and nitrogen.

Explanation:

Silicon crystallises in a giant covalent structure at standard conditions, specifically in a diamond cubic lattice. It thus has a high melting point of 1414 °C. It is not known to have any allotropes at standard pressure, but several other crystal structures are known at higher pressures.