Chemistry - Giant Covalent Structure

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What is a giant covalent structure?
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A structure containing many atoms joined by covalent bonds.
Give one example of giant covalent structures.
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Diamond, Graphite, silicon dioxide.
Why are giant covalent structures very strong?
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Because they contain many strong covalent bonds.
How are atoms arranged in giant covalent structures?
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In a regular lattice.
Why do giant covalent structures have very high melting points?
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Many strong covalent bonds must be broken.
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