Question

question 1
match the appropriate solvent to use to dissolve the solid.

solid iodine choose
calcium bromide choose
liquid cyclohexane (a nonpolar compound)
liquid ammonia

Explanation:

Step1: Analyze solid iodine

Iodine ($I_2$) is a nonpolar molecule. According to the principle "like dissolves like", nonpolar solutes dissolve well in nonpolar solvents. Liquid cyclohexane is a nonpolar compound, so solid iodine should dissolve in liquid cyclohexane.

Step2: Analyze calcium bromide

Calcium bromide ($CaBr_2$) is an ionic compound (polar), and liquid ammonia is a polar solvent (capable of solvating ions). So calcium bromide should dissolve in liquid ammonia.

Answer:

solid iodine: liquid cyclohexane (a nonpolar compound)
calcium bromide: liquid ammonia