**Understanding Phase Changes in Red Phosphorus**The triple point of red phosphorus occurs at a pressure of 43 atmospheres (atm) and a temperature of 590°C. This means that at this specific combination of pressure and temperature, red phosphorus can coexist in three different phases: solid, liquid, and gas.### Problem Statement:If a solid sample of red phosphorus is heated from 25°C to 700°C at 1 atm, what will be its phase?#### Options:A) ... more information is needed to determine if a phase change occurs.B) ... the solid will remain a solid.C) ... the solid will melt.D) ... the solid will sublime.### Analysis:Considering the initial conditions:- Initial Temperature: 25°C- Final Temperature: 700°C- Constant Pressure: 1 atmGiven the triple point data and the conditions:- At 1 atm, the triple point temperature (590°C) is notably higher than the current temperature (25°C) but lower than the final temperature (700°C).- At a pressure of 1 atm, the behavior of red phosphorus as it heats past 590°C must be considered; specifically, whether it transitions directly from solid to gas (sublimation) without forming a liquid due to these conditions.### Interpretation of the Data:When the temperature surpasses the triple point while maintaining a lower pressure (1 atm), the solid red phosphorus bypasses the liquid state and directly forms gas. This process is known as sublimation.### Conclusion:At 1 atm, heating red phosphorus from 25°C to 700°C causes it to sublime rather than melt into a liquid.Correct Answer: **D) ... the solid will sublime.**

A phase diagram is graphical representation of physical states of a substance under different…

The triple point of red phosphorus occurs at 43 atm and 590 °C. If a solid sample of red phosphorus is heated from 25 °C to 700 °C at 1 atm .. O A). more information is needed to determine if a phase change occurs. ... O B) ... the solid will remain a solid. C) the solid will melt. ... D) the solid will sublime. ...

The triple point of red phosphorus occurs at 43 atm and 590 °C. If a solid sample of red phosphorus is heated from 25 °C to 700 °C at 1 atm .. O A). more information is needed to determine if a phase change occurs. ... O B) ... the solid will remain a solid. C) the solid will melt. ... D) the solid will sublime. ...

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

**Understanding Phase Changes in Red Phosphorus**

The triple point of red phosphorus occurs at a pressure of 43 atmospheres (atm) and a temperature of 590°C. This means that at this specific combination of pressure and temperature, red phosphorus can coexist in three different phases: solid, liquid, and gas.

### Problem Statement:
If a solid sample of red phosphorus is heated from 25°C to 700°C at 1 atm, what will be its phase?

#### Options:
A) ... more information is needed to determine if a phase change occurs.
B) ... the solid will remain a solid.
C) ... the solid will melt.
D) ... the solid will sublime.

### Analysis:
Considering the initial conditions:
- Initial Temperature: 25°C
- Final Temperature: 700°C
- Constant Pressure: 1 atm

Given the triple point data and the conditions:
- At 1 atm, the triple point temperature (590°C) is notably higher than the current temperature (25°C) but lower than the final temperature (700°C).
- At a pressure of 1 atm, the behavior of red phosphorus as it heats past 590°C must be considered; specifically, whether it transitions directly from solid to gas (sublimation) without forming a liquid due to these conditions.

### Interpretation of the Data:
When the temperature surpasses the triple point while maintaining a lower pressure (1 atm), the solid red phosphorus bypasses the liquid state and directly forms gas. This process is known as sublimation.

### Conclusion:
At 1 atm, heating red phosphorus from 25°C to 700°C causes it to sublime rather than melt into a liquid.

Correct Answer:
**D) ... the solid will sublime.**

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