To determine the phase change of carbon dioxide when the temperature decreases from -40°C to -80°C at 2 atm, we need to refer to the phase diagram of carbon dioxide.

1. **Identify the initial state**: At -40°C and 2 atm, carbon dioxide is in the gaseous state. This is because the sublimation point of CO₂ at 1 atm is -78.5°C, and at 2 atm, it remains a gas at -40°C.

2. **Identify the final state**: At -80°C and 2 atm, carbon dioxide will be in the solid state. This is because -80°C is below the sublimation point of CO₂ at 2 atm, meaning it will be a solid.

3. **Determine the phase change**: Since the initial state is gas and the final state is solid, the phase change that occurs is deposition (gas to solid).

Therefore, the correct answer is:
C. A gas changes to a solid.

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To determine the phase change of carbon dioxide when the temperature decreases from -40°C to -80°C at 2 atm, we need to refer to the phase diagram of carbon dioxide.

1. **Identify the initial state**: At -40°C and 2 atm, carbon dioxide is in the gaseous state. This is because the sublimation point of CO₂ at 1 atm is -78.5°C, and at 2 atm, it remains a gas at -40°C.

2. **Identify the final state**: At -80°C and 2 atm, carbon dioxide will be in the solid state. This is because -80°C is below the sublimation point of CO₂ at 2 atm, meaning it will be a solid.

3. **Determine the phase change**: Since the initial state is gas and the final state is solid, the phase change that occurs is deposition (gas to solid).

Therefore, the correct answer is:
C. A gas changes to a solid.

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To determine the phase change of carbon dioxide when the temperature decreases from -40°C to -80°C at 2 atm, we need to refer to the phase diagram of carbon dioxide.

1. **Identify the initial state**: At -40°C and 2 atm, carbon dioxide is in the gaseous state. This is because the sublimation point of CO₂ at 1 atm is -78.5°C, and at 2 atm, it remains a gas at -40°C.

2. **Identify the final state**: At -80°C and 2 atm, carbon dioxide will be in the solid state. This is because -80°C is below the sublimation point of CO₂ at 2 atm, meaning it will be a solid.

3. **Determine the phase change**: Since the initial state is gas and the final state is solid, the phase change that occurs is deposition (gas to solid).

Therefore, the correct answer is:
C. A gas changes to a solid.

With carbon dioxide, what phase change takes place when the temperature decreases from -40°C to -80°C at 2 atm?A.A liquid changes to a solid.B.A solid changes to a liquid.C.A gas changes to a solid.D.A gas changes to a liquid.SUBMITarrow_backPREVIOUS

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