Phase changes in carbon dioxide 10,000- 1,000 Solid Pressure, atm 100 10 1- Liquid *Triple point Vapour *Critical point 0.1 -100 -80 -60 -40 -20 0 20 40 60 Temperature, °C 1. At what temperature and pressure is the triple point of CO₂ ?
Phase changes in carbon dioxide 10,000- 1,000 Solid Pressure, atm 100 10 1- Liquid *Triple point Vapour *Critical point 0.1 -100 -80 -60 -40 -20 0 20 40 60 Temperature, °C 1. At what temperature and pressure is the triple point of CO₂ ?
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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States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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3. Air pressure is about 1 atm. Why does dry ice sublimate instead of melting?
Transcribed Image Text:**Phase Changes in Carbon Dioxide**
This phase diagram illustrates the states of carbon dioxide as a function of temperature and pressure.
- **Axes**:
- The x-axis represents temperature in degrees Celsius (°C), ranging from -100 to 60.
- The y-axis represents pressure in atmospheres (atm), ranging from 0.1 to 10,000 on a logarithmic scale.
- **Regions**:
- The purple region denotes the solid state of carbon dioxide.
- The green region indicates the liquid state.
- The red region represents the vapor state.
- **Key Points**:
- **Triple Point**: The diagram shows a point labeled "Triple point," where the three phases—solid, liquid, and vapor—coexist. It is located at approximately -56°C and 5.1 atm.
- **Critical Point**: This is marked on the diagram, indicating the endpoint of the liquid-vapor phase boundary. Beyond this point, CO₂ cannot exist as a liquid regardless of the pressure applied. It is located at around 31°C and 72.9 atm.
**Questions:**
1. At what temperature and pressure is the triple point of CO₂?
- Answer: Approximately -56°C and 5.1 atm.
This diagram is essential for understanding the conditions under which carbon dioxide transitions between solid, liquid, and gaseous states.
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