Is SiO2 is a polar molecule or not? the difference in electronegativity between the two atoms is 1.7 I read that SiO2 doesn't exist as single molecule, in which the Si connected to 4 oxygen? so my question can I consider it polar thanks
Sio2 doesn't exist as a molecule rather exists as network of si and o bonds with si bonded to 4 O atoms. SiO2 simply denotes their ratio in the complete structure. Si-O bonds are very polar but there are four si-O bonds which cancel the dipole, making the structure as a whole, non-polar.