Phase Changes and Diagrams of Water and Carbon Dioxide

The video tutorial covers phase diagrams for CO2 and water, explaining phase changes such as melting, freezing, vaporization, condensation, sublimation, and deposition. It details the phase diagrams of CO2 and water, highlighting the triple point, critical point, and density differences between phases. The tutorial also discusses the concept of supercritical fluids and the conditions under which sublimation occurs.

What is the term for the phase change from a solid directly to a gas?

• Condensation

• Sublimation

• Freezing

• Melting

In the phase diagram of CO2, what happens at 1 atm when the temperature is increased?

• CO2 freezes

• CO2 condenses

• CO2 sublimes

• CO2 melts

Which phase of CO2 has a higher density at higher pressures?

• Supercritical CO2

• Gaseous CO2

• Liquid CO2

• Solid CO2

What is a supercritical fluid?

• A fluid with properties of both gas and liquid

• A solid that melts at high pressure

• A liquid that freezes at low temperature

• A gas that cannot be liquefied

What is the significance of the critical point in a phase diagram?

• It is where sublimation occurs

• It indicates the end of the liquid phase

• It marks the start of the solid phase

• It is where a supercritical fluid forms

How does the melting point line of water differ from that of CO2?

• It is vertical

• It is horizontal

• It has a negative slope

• It has a positive slope

At 1 atm, what happens to ice as the temperature increases?

• It sublimes into gas

• It condenses into solid

• It freezes into ice

• It melts into liquid

What happens to water at 1 atm as the temperature increases?

• It freezes into ice

• It melts into liquid and then vaporizes

• It sublimes into gas

• It condenses into solid

What is the normal boiling point of a substance?

• The temperature at which it boils at 1 atm

• The temperature at which it condenses at 1 atm

• The temperature at which it freezes at 1 atm

• The temperature at which it sublimes at 1 atm

What does the term 'normal' indicate when referring to boiling or melting points?

• The process occurs at 3 atm

• The process occurs at 2 atm

• The process occurs at 0 atm

• The process occurs at 1 atm