Critical Point

On which parts of the graph does the temperature remain the same?

• Between C and D

• Between D and E

• At C, D, or E

• On both flat sections

Tags

NGSS.MS-PS1-4

What would the state of this substance be at 1 ATM of pressure at a 80 degrees Celsius?

• Solid

• Liquid

• Gas

• Michigan

Tags

NGSS.HS-PS3-4

What is the critical point in thermodynamics?

• The temperature and pressure at which the gas and liquid phase of a substance become indistinguishable

• The point at which a substance changes from solid to liquid

• The temperature at which a substance reaches its boiling point

• The pressure at which a substance reaches its melting point

Which of the following best describes the critical point of water?

• The point where water can exist in all three states simultaneously

• The temperature and pressure at which water's liquid and gas phases become indistinguishable

• The temperature at which water freezes

• The pressure at which water boils

At the critical point, what happens to the density of a substance's liquid and gas phases?

• The density of the liquid phase becomes zero

• The density of the gas phase becomes infinite

• The densities of the liquid and gas phases become equal

• The densities of the liquid and gas phases become zero

Which equation represents the critical point condition for a pure substance?

• Both B and C

In a phase diagram, where is the critical point located?

• At the intersection of the solid-liquid equilibrium line

• At the end of the liquid-gas equilibrium line

• At the beginning of the solid-gas equilibrium line

• At the center of the diagram

What is the significance of the critical point in the context of supercritical fluids?

• It marks the temperature and pressure above which a substance can only exist as a solid

• It marks the temperature and pressure above which a substance can only exist as a liquid

• It marks the temperature and pressure above which a substance can only exist as a gas

• It marks the temperature and pressure above which a substance can exist as a supercritical fluid

Which of the following substances has the highest critical temperature?

• Water

• Carbon dioxide

• Oxygen

• Nitrogen

What is the critical temperature of carbon dioxide?

• 31.1°C

• 100°C

• 0°C

• -78.5°C