Question

Which of the following processes releases heat? Evaporation Freezing Melting Sublimation . I know for sure it is not freezing.

Answer 1

Freezing  process  release  heat  that  is  the  process  is  exothermic . In  addition   condensation  process also  is  exothermic. When  substance  losses  heat  energy  the  attractive  force  between  atom    slow  down  and  hence reduces  their  mobility.Example  when   water  turn  to  a  ice  cubes  the  reaction  releases  heat  energy.

Answer 2

During freezing heat will be released. Normally we wont think like that ,but the reality is during freezing the heat get released. the liquid water will have more energy than the frozen water .so during this transition the energy of the water get released as the latent heat. Basically when we need to reduce the temperature ie. freezing a substance, the heat already absorbed in the substance should be released out of the substance.