Which example involves a phase change in which heat energy is released by the substance?
a. freezing ice cream
b. cooking a pot of soup
c. melting ice under sunlight
d. watching frost disappear into air
choose an choice

Some molecular compounds, such as hcl, ionize completely in solution. for molecular compounds such as h2co3, most molecules do not ionize in solution. which describes the properties of these two solutes? a. hcl and h2co3 have the same effect on the properties of the solution. b. hcl raises the freezing point of water more than h2co3 does. c. hcl raises the boiling point of water more than h2co3 does.