At 25°C gallium is a solid with a density of 5.91 g/cm

Question

At 25°C gallium is a solid with a density of 5.91 g/cm³ and a melting point, 29.8°C, just slightly above room temperature. The density of liquid gallium just above the melting point is 6.1 g/cm³. Based on this information, what unusual feature would you expect to find in the phase diagram of gallium?

Accepted Answer

Step 1: Understand the problem. The problem provides information about the density of gallium in its solid and liquid states. The density of solid gallium is less than the density of liquid gallium.. Step 2: Recall the general trend in phase diagrams. Typically, the solid phase of a substance is denser than its liquid phase. This is why, for most substances, the solid phase sinks in the liquid phase.. Step 3: Identify the unusual feature. Given that the density of solid gallium is less than the density of liquid gallium, we can infer that solid gallium would float in liquid gallium. This is an unusual feature.. Step 4: Reflect this feature in the phase diagram. In a typical phase diagram, the line between the solid and liquid phases slopes to the right with increasing pressure. However, for substances like gallium where the solid is less dense than the liquid, this line would slope to the left. This is because increasing pressure would favor the phase with higher density, which is the liquid phase in this case.. Step 5: Conclude the solution. Therefore, the unusual feature you would expect to find in the phase diagram of gallium is that the line between the solid and liquid phases slopes to the left, indicating that the solid phase is less dense than the liquid phase.

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Phase Diagrams

Density Anomalies in Phase Changes

Melting Point and Phase Transition