Chemistry

Question Analysis
This question tests the student's ability to determine the phase change that occurs when a substance's temperature is increased, given its initial phase and conditions.

Key Concept Explanation
When a substance's temperature is increased, it may cross a phase boundary, leading to a phase change. For a substance initially in the solid phase, increasing the temperature to a point above the melting point (while keeping the pressure constant) will cause the substance to melt.

Step-by-step Solution
1. Identify the initial phase and conditions (solid at -5 °C and 1 atm).
2. Use the given melting point at 1 atm (5 °C).
3. Note th...