Explanation:
Graphite has a layered structure with weak van der Waals forces between layers and delocalized electrons within layers, making it a good conductor and lubricant. Diamond is the hardest; coal is amorphous carbon.
Explanation:
Teflon is polytetrafluoroethylene (PTFE) polymerized from tetrafluoroethene (CF₂=CF₂). CH₂=CH₂ gives polythene; CH₂=CHCl gives PVC; CH₂=CH-C₆H₅ (styrene) gives polystyrene. The C-F bond is extremely strong, giving Teflon its chemical inertness and thermal stability.
Explanation:
Graham's law of diffusion/effusion states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass. Lighter gases diffuse faster. This law helps in separating isotopes (e.g., ²³⁵U enrichment) and understanding gas behavior. Boyle's and Charles' deal with P-V-T relationships. Avogadro's deals with V and number of moles.
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