Endothermic

  • Products have more energy than reactants                                                             

             โ—‹ +โˆ†๐ป

            โ—‹ Ex: decomposition reaction

  • Forward reaction has higher activation energy than reverse

Exothermic:

  • Products have less energy than reactants

          โ—‹ -โˆ†๐ป

          โ—‹ Ex: synthesis reactions                                                                                                         

  • Reverse reaction has higher activation energy that forward reaction

Why is dissolving an ionic compound an ambiguous change (can be classified as both physical and chemical)