sodium chorin an ionic compound has a high melting point of 801 C whereas molecular solid such as ice has relatively low melting point of 0C Explain this difference
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Answer: Sodium and chlorine have a huge difference in electronegativity (the capacity of a component to pull on electrons), bringing about a major distinction in electron sharing, delivering a particle with an enormous "dipole moment" or extremity.
The polarity implies that the parts (particles, for this situation) are Truly drawn to one another, and are drawn to the point that they remain together (for this situation, in a crystal lattice). It takes a Ton of energy to inspire them to break this grid and soften. All that energy = high temperature i.e., 801C.
Pure water and ice, kept protected from the warm external world, come to balance over the long run. On a sub-atomic level, water particles are freezing onto the ice at similar rate as they are liquefying off of it.
The whole water/ice arrangement is at the softening/edge of freezing over, 32°F (0°C). Adding rock salt — or any substance that disintegrates in water — disturbs this harmony. Less water particles are interfacing with the ice out of the blue, so the freezing rate is eased back.
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