Learning Path
Question & Answer1
Understand Question2
Review Options3
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Explore TopicChoose the Best Answer
A
It increases the kinetic energy of the molecules, leading to melting.
B
It decreases the pressure of the substance, preventing melting.
C
It causes the solid to become more dense, thereby delaying melting.
D
It reduces the molecular interactions, freezing the substance.
Understanding the Answer
Let's break down why this is correct
Answer
Increasing the temperature of a substance moves its state point rightward on the temperature axis of a phase diagram. As the point reaches the melting line, the solid phase becomes unstable and the substance transitions into the liquid phase. The melting line itself rises with pressure, so at higher pressures the melting temperature is higher, but the basic rule remains: higher temperature drives the solid‑to‑liquid transition. For example, ice at one atmosphere melts at 0 °C; if you heat it to 5 °C, it is already liquid. Thus, on a phase diagram, raising temperature shrinks the solid region and expands the liquid region.
Detailed Explanation
When you heat a solid, the molecules start moving faster. Other options are incorrect because Some think warming a material lowers its pressure and stops melting; The idea that heating makes a solid denser is wrong.
Key Concepts
Phase transitions
Kinetic energy of molecules
Effects of pressure and temperature
Topic
Phase Diagrams
Difficulty
easy level question
Cognitive Level
understand
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