Answer to Question #168265 in General Chemistry for Shein

Question

Based on your experience, when ice melts to liquid water, is the process of endothermic or exothermic? When liquid water freezes to ice at 0°C, is this endothermic or exothermic? (assume that the ice/water is the system in each case.)

Answer 1

When ice melts to liquid water, it is an endothermic process because heat must be absorbed to melt the ice without a change in temperature (Latent heat of fusion).

When liquid water freezes to ice, the process is exothermic because energy is given out for the liquid water to form a more stable ice.