For example, ionic compounds, which are very polar, are often soluble in the polar solvent water. Nonpolar substances are likely to dissolve in nonpolar solvents. For example, nonpolar molecular substances are likely to dissolve in hexane, a common nonpolar solvent.
The molecules in gas are farther apart and have more room to bounce around than liquid
Definitely Calcium Chloride.
All the others are covalent.
