What has to happen in order for melting or boiling to occur in an ionic compound?

A. The lons have to break apart

B. The anions must turn into cations

C. The protons and neutrons must come out of
the nucleus.

D. The lonic compound must first be dissolved in
water.

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)