Phase Diagrams and States of Matter

The video tutorial introduces phase diagrams, explaining their role in depicting the stability of different phases of matter under varying conditions of pressure and temperature. It covers the basic structure of phase diagrams, including the significance of lines and special points like the triple and critical points. The tutorial also discusses phase changes such as melting, boiling, and sublimation, using real-life examples like water and carbon dioxide to illustrate these concepts.

What are the three common states of matter discussed in the video?

• Solids, Plasma, Gases

• Gases, Plasma, Liquids

• Plasma, Solids, Liquids

• Solids, Liquids, Gases

What does a phase diagram primarily plot?

• Pressure against Temperature

• Volume against Temperature

• Mass against Volume

• Volume against Pressure

What happens to a solid when the temperature is increased at constant pressure?

• It condenses

• It freezes

• It sublimes

• It melts

What is the process called when a solid turns directly into a gas?

• Condensation

• Sublimation

• Deposition

• Melting

What is the triple point on a phase diagram?

• Where solid and liquid coexist

• Where liquid and gas coexist

• Where solid, liquid, and gas coexist

• Where only gas exists

What is a supercritical fluid?

• A gas at low pressure

• A liquid at low temperature

• A solid at high pressure

• A state with properties of both liquid and gas

What is the critical point on a phase diagram?

• Where solid and liquid coexist

• Where only liquid exists

• Where liquid and gas coexist

• Where solid, liquid, and gas coexist

What is unique about the phase diagram of water?

• It has a positive slope for the melting line

• It sublimes at atmospheric pressure

• It has a negative slope for the melting line

• It has no triple point

At what temperature does CO2 sublime at atmospheric pressure?

• 25°C

• -78°C

• 100°C

• 0°C

Why can ice skaters skate on ice according to the phase diagram of water?

• Ice is slippery

• Ice has a low freezing point

• Ice has a high boiling point

• Ice melts under pressure