Question

In silicon dioxide (a) each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms .

Answer 1

Silicon dioxide has a giant covalent structure. ... Each oxygen atom is covalently bonded to two silicon atoms. This means that, overall, the ratio istwo oxygen atoms to each silicon atom, giving the formula SiO2. Silicon dioxideis very hard.

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Answer 2

SiCl4 has a larger central atom than CCl4 , which makes more vulnerable to attack in hydrolysis.The differing rates of hydrolysis are attributed to the greater atomic radius of the silicon atom allowing attack at silicon, and to the polar nature of the Si-Cl bonds favoring nucleophilic attack.