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The averge (C C) bond energy is 343 kJ m...

The averge `(C _C)` bond energy is `343 kJ mo1^(-1)`. What do you predict for the Si -Si single bond energy
(b) Carbrundum `(SiC)` and corundun `(A1_(2)O_(3))` are important abrasives Comment on the structures for these compounds to explain why they have such hardness .

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Covalent bonds between the `3rd` Period non-metals are generally weaker than the bonds between atoms of their 2nd period neighbours `Si-Si` bonds are expected to be weaker than `C-C` bonds Their bond strength should be lass than `300kJ` `mol^(-1)`
(b) The hardness reults from the fact the atoms are bonded together in three dimensional arrays by strong bonds SiC has the diamond structure The bonds in `A1_(2)O_(3)` have ionic character as well as covalent .
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