Which is the name for sio2? silicon dioxide silicon trioxygen disilicon dioxygen monosilicon oxide

Silicon dioxide.

Explanation: First off, there's two nonmetals, so we use prefixes to name each element. There's one silicon, but you don't put the mono- when there's only one of the first element. There's two oxygens, and the prefix for two is di-. So, SiO2 is Silicon dioxide.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.