Question

during the dissolution of urea ,heat what happens

Answer 1

In this experiment you will determine whether heat is evolved or absorbed when urea (CO(NH2)2) dissolves in water, and how much heat is transferred during this process. ... If heat is coming from the reaction, then the reaction must be exothermic, and q of the reaction would be negative.

Answer 2

The negative sign indicates the dissolution is exothermic. In contrast, when solid NaCl dissolves in water, heat is absorbed, and the dissolution is said to be endothermic. It indicates that 3.88 kJ of heat is absorbed when 1 mole of NaCl is dissolved in water.