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Chapter 2 Key Points - Coggle Diagram
Chapter 2 Key Points
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‑ Found in non‑metal molecules, diamond, Si, SiC, GaAs
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‑ Diamond: 3D covalent network, hard, high melting point, no free electrons (no conduction)
‑ Graphite: layered structure; strong covalent within layers, weak forces between layers; soft, conducts electricity
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Secondary bonding (no electron transfer / sharing, weak)
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‑ Van der Waals bonds: exist in nearly all substances; from fluctuating or permanent dipoles; low binding energy
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Bond‑property summary
‑ Ceramics (ionic / covalent): large bond energy, high T_m, low thermal expansion
‑ Metals (metallic): variable bond energy, ductile, good conductivity
‑ Polymers: covalent inside chains, secondary bonds between chains; low T_m, large thermal expansion
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