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April 19, 2014

Homework Help: science

Posted by Sara on Monday, October 8, 2012 at 5:33pm.

I dissolved two different white solids into water. One solid dissolved and gave off heat and the other became cold. Reading various texts online, I was not sure if these were physical or chemical changes. Some texts say if these solids are salts then these are physical changes. Other texts say since ionic bonds are broken, these are chemical changes. Which one is correct?

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