Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: tweedledee on February 13, 2012, 07:26:09 PM
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If it takes 500 joules of heat to melt an ice cube, how much heat would be given off to re-freeze the water?
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What is your train of thought? Do you have any idea what this kind of phase change, and the heat difference associated with it, is called?
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It either takes more, less, or exactly the same amount of energy. Yeah, I know, that sounds dumb of me to mention. ;D But if it took more or less, wouldn't that be really useful? As a free source of energy? Ever hear of any of those, in real life?