Sodium chloride (table salt) consists of Na+ and Cl- . Each has a charge of one. In calcium carbonate (chalk) each ion has a charge of two (Ca2+ and CO32-). Salt does dissolve in water but chalk does not dissolve. How do you think the charge of the ions influences whether an ionic compound will dissolve?

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.