2006-12-16 08:07:27 · 3 answers · asked by amy 1 in Science & Mathematics ➔ Chemistry
your question is alot dependent of what kinds of substance are you talking about
2006-12-16 08:24:33 · answer #1 · answered by ghakh 3 · 0⤊ 0⤋
The heat of fusion is generally a lot less than the heat of crystallization(vaporization also i think). This is because it requires less energy to go from a solid to a liquid than it requires to go from a liquid to a gas. This is because crystallization occurs at a much higher temperature than fusion, thus requiring more energy. The exact comparance differs from substance to substance, but generally this is always the case.
2006-12-16 08:32:01 · answer #2 · answered by soccerswim88888 1 · 0⤊ 0⤋
heat of fusion is always endothermic, heat of crystallization can be exothermic or endothermic, depending of the substance, and it can even change for the same substance, depending of the impurities.
See for example http://www.agu.org/pubs/toc/gl/gl/gl0105/2000GL011350/2000GL011350.pdf
about the heat of crystallization of water.
2006-12-16 08:54:43 · answer #3 · answered by scientific_boy3434 5 · 0⤊ 0⤋