Posted by Yuval on Friday, September 19, 2008 at 1:12am.
See my response to the question directly above this question. You know the reaction is endothermic.
Consider the following:
*When you dissolve NaCl in water, the mixture cools indicating an endothermic change. It leads to products with higher enthalpy.
*NaCl crystals are highly orderly structures which means that their entropy is low. As they dissolve in water they dissociate into randomly dispersed ions with an increase in entropy (disorder).
*A chemical or physical change tends to be spontaneous
(a) if it leads to products of lower enthalpy (exothermic change, or one with negative deltaH ),
(b) if it leads to greater disorder (higher entropy or positive deltaS )
Now you have everything you need to draw you own conclusions.
i would like to learn more about the last chapter of our text book study mate the chemical change
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