Posted by nina on Sunday, October 5, 2008 at 1:50pm.
Just a hint and you do the rest. Potassium nitrate (KNO3) dissolved in water gets colder but a chemical reaction has not taken place. That's just due to the bonds breaking and it takes energy to break the bonds of the KNO3 crystal lattice.
well the change has occured but not a physical change. The temperture changed by last week it being cold and this week its very warm so that's it
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