Phase Changes and Diagrams

The video tutorial explains phase diagrams, focusing on axes, phases, triple and critical points, and phase change lines. It covers sublimation, deposition, and the effects of pressure on phase changes, using examples like water and carbon dioxide to illustrate differences.

What is a phase diagram primarily used for?

• To show the chemical composition of substances

• To illustrate the phase changes of substances

• To measure the density of substances

• To calculate the atomic mass of elements

Which substance is an exception to the typical phase diagram rules?

• Nitrogen

• Water

• Oxygen

• Carbon dioxide

What does the vertical axis on a phase diagram represent?

• Density

• Temperature

• Volume

• Pressure

At the triple point, how many phases of a substance can coexist?

• One

• Two

• Three

• Four

What happens at the critical point of a substance?

• It evaporates completely

• It becomes a solid

• It freezes instantly

• It can no longer be compressed into a liquid

What is the effect of increasing pressure on the melting point of a solid?

• It decreases the melting point

• It increases the melting point

• It has no effect

• It turns the solid into a gas

What is the process called when a liquid turns into a vapor?

• Vaporization

• Sublimation

• Condensation

• Freezing

What is sublimation?

• The transition from vapor to liquid

• The transition from solid to liquid

• The transition from liquid to gas

• The transition from solid to vapor

Under what conditions does deposition occur?

• High temperature and high pressure

• Low temperature and low pressure

• High temperature and low pressure

• Low temperature and high pressure

What happens to a vapor when enough pressure is applied?

• It turns into a liquid

• It remains a vapor

• It turns into a solid

• It evaporates