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    Which is a stronger bond covalent or ionic and which has a higher melting point?

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    Covalent bonds are stronger. When you melt small molecules (e.g. water) formed of covalent bonds, you never break the covalent bonds as they are too strong. You just break the intermolecular forces. For a quick comparison though, NaCl (ionic) melts at about 800 deg C, whilst diamond (giant covalent structure) requires about 3550 deg C to melt.
 
 
 
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