Indicate whether Delta S and Delta H is positive or negative. Then indicate if the reaction is entropy driven, enthalpy driven or neither.
NaCl(s) + H2O(l) + Heat => NaCl (aq)
Chemistry - DrBob222, Friday, September 19, 2008 at 11:07am
See my response to the question directly above this question. You know the reaction is endothermic.
Chemistry - GK, Friday, September 19, 2008 at 11:17am
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.
Chemistry - april, Tuesday, September 30, 2008 at 2:50am
i would like to learn more about the last chapter of our text book study mate the chemical change