Why is the melting point of SiO2 higher than that of NaCl?


makes think sio2 ionic? not ionic. let me repeat that. sio2 not ionic.

sio2 contains covalent bonds. sio2 forms network of si , o atoms. network structure (crystalline structure) of sio2, diamond , nacl makes these substances have high melting points. not internal bond type affects melting point, network structure makes high melting point.

substances not form networks of atoms (crystals) held weaker intermolecular attractive forces , therefore have lower melting , boiling points.

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misconception melting point , "ionic" vs "covalent" bonding persists in comments made yunashe. , many others don't seem "get it". **intermolecular** forces of attraction affect melting , boiling points not internal bond types. , part of intermolecular bonding deals formation of large, crystalline networks, each atoms bonded multiple other atoms. makes no difference type of bond in these networks, depends on fact network of atoms exists. makes higher melting point.

terry may physics teacher, doesn't make him immune persistent misconceptions. says, "... there covalent compounds have higher moments (not in realm of ionic). sio2 1 of polar covalent molecules lend higher melting point."

sio2 not molecular in sense there individual molecules of sio2. unlike co2, sio2 forms network of si , o atoms.

nacl ionic sio2 covalent. ionic bonds have higher melting points of covalent bonds. can explain why nacl lower.......


Science & Mathematics Chemistry Next



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