After a student makes a solution, its temperature rises. What term describes this process?
a reaction occur if occours one or both of this cases: if increases the entropy of the system (and it happens every time you make a solution starting from pure substances). If the bonds among products is stronger than the bonds among reactants (and it happens only when you have warming of the system).That means a decrease of enthalpy. The new bonds are idratation bonds that replace original ones.
Since the increase of entropy can be bigger than increase of enthalpy you can have solutions with decrease of temperature (for example if you mix