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questions about ionic bonding and magnesium

1.  Do magnesium and cholorine form an ionic bond or a covalent bond and why?
2.  Using the answer from #1 what is the polar nature of the water molecule, what causes magnesium chloride to dissolve in seawater?
3.  If you heat a container full of seawater, the water will evaporate leaving behind the salts such as magnesium chloride, what kind of mixture is seawater?

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