Below is a phase diagram for a substance. P N R SA X .0 Otriple point. Onormal boiling point. O critical point. Omelting point. boiling point. M T What is the name for point Z on the diagram? N

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### Phase Diagram Explanation

Below is a phase diagram representing different states of a substance. The diagram has pressure (P) on the vertical axis and temperature (T) on the horizontal axis. Various points on the diagram are labeled as R, X, O, Z, N, S, and M.

#### Key Points on the Diagram:
- **Point R** - Located at higher pressure and moderate temperature.
- **Point X** - Represents the intersection of different phases.
- **Point O** - Positioned at a moderate pressure and temperature.
- **Point Z** - Positioned at a high temperature along the line extending rightward.
- **Point N** - Lower pressure than O.
- **Point S** - Lower than X and N, closer to low pressure regions.
- **Point M** - At a low pressure and high temperature.

#### Question:
What is the name for point Z on the diagram?

##### Options:
- Normal boiling point.
- **Critical point.** (Correct Answer)
- Melting point.
- Boiling point.
- Triple point.

### Diagram Explanation
The diagram illustrates different regions and points where phase changes occur. The critical point (Z) is identified as the end point of the phase boundary between liquid and gas phases, beyond which distinct liquid and gas phases do not exist.

This educational phase diagram helps students understand critical concepts related to phase transitions and the behavior of substances under various pressures and temperatures.
Transcribed Image Text:### Phase Diagram Explanation Below is a phase diagram representing different states of a substance. The diagram has pressure (P) on the vertical axis and temperature (T) on the horizontal axis. Various points on the diagram are labeled as R, X, O, Z, N, S, and M. #### Key Points on the Diagram: - **Point R** - Located at higher pressure and moderate temperature. - **Point X** - Represents the intersection of different phases. - **Point O** - Positioned at a moderate pressure and temperature. - **Point Z** - Positioned at a high temperature along the line extending rightward. - **Point N** - Lower pressure than O. - **Point S** - Lower than X and N, closer to low pressure regions. - **Point M** - At a low pressure and high temperature. #### Question: What is the name for point Z on the diagram? ##### Options: - Normal boiling point. - **Critical point.** (Correct Answer) - Melting point. - Boiling point. - Triple point. ### Diagram Explanation The diagram illustrates different regions and points where phase changes occur. The critical point (Z) is identified as the end point of the phase boundary between liquid and gas phases, beyond which distinct liquid and gas phases do not exist. This educational phase diagram helps students understand critical concepts related to phase transitions and the behavior of substances under various pressures and temperatures.
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