Question

What is the relation between heat of fusion and bond energy?

Answer 1

Solids can be heated to the point where the molecules holding their bonds together break apart and form a liquid. The most common example is solid ice turning into liquid water. This process is better known as melting, or heat of fusion, and results in the molecules within the substance becoming less organized. When a substance converts from a solid state to a liquid state, the change in enthalpy ( ΔH ) is positive. However, if the substance is transforming from a liquid state to a solid state the change in enthalpy (ΔH) is negative. This process is commonly known as the freezing, and results in the molecules within the substance becoming more ordered.