Chemistry

Question Analysis
This question assesses the student's understanding of the behavior of substances along phase boundaries on a phase diagram.

Key Concept Explanation
Along the solid-liquid boundary on a phase diagram, the substance exists in a state of dynamic equilibrium between the solid and liquid phases. At these conditions, the rate of melting (solid → liquid) equals the rate of freezing (liquid → solid).

Step-by-step Solution
1. Identify the phase boundary being discussed (solid-liquid boundary).
2. R...