Chemistry

Question Analysis
This question involves linking the slope of the solid-liquid boundary line to phase density. The main focus is on the general behavior of phase diagrams for most substances.

Key Concept Explanation
A positive slope for the solid-liquid boundary means increasing pressure favors the denser solid phase (since higher pressure stabilizes denser phases). Most substances (e.g., CO₂, ethanol) follow this trend.

Step-by-Step Solution
1. Recall the relationship between boundary slope and phase density for most substances.
2. Match the "solid is denser" condition to the ...