Phase Diagrams and States of Matter

Phase Diagrams and States of Matter

Assessment

Interactive Video

Physics

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explains phase diagrams, which show the physical state of a substance as temperature and pressure change. It describes the regions and lines in the diagram, indicating stable phases and equilibrium conditions. The video provides a molecular view of solid, liquid, and gas phases, highlighting particle arrangements and movements. It discusses phase equilibrium, where transitions like melting and freezing occur at equal rates. The critical point, where liquid and gas phases become indistinguishable, and the triple point, where all three phases coexist, are also covered.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a phase diagram illustrate about a substance?

The chemical composition of a substance

The physical state of a substance as temperature and pressure change

The color changes of a substance

The atomic structure of a substance

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a phase diagram, what do the lines separating regions represent?

The equilibrium conditions between two phases

The temperature of the substance

The chemical reactions occurring

The pressure of the substance

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do particles behave in the solid phase compared to the liquid phase?

Particles in a solid are more restricted in movement than in a liquid

Particles in a liquid are fixed and do not move

Particles in a solid are fixed and do not move

Particles in a liquid are more tightly packed than in a solid

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a key difference between the liquid and gas phases at the molecular level?

Particles in a liquid are fixed in place

Particles in a gas are closer together than in a liquid

Particles in a liquid are far apart except when they collide

Particles in a gas are far apart except when they collide

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What occurs at the solid-liquid equilibrium line on a phase diagram?

Sublimation occurs

Melting and freezing occur at the same rate

Only freezing occurs

Only melting occurs

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

At the liquid-gas equilibrium line, what processes occur at the same rate?

Melting and freezing

Vaporizing and condensing

Subliming and depositing

Boiling and freezing

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the density of a gas as it approaches the critical point?

The density increases

The density fluctuates

The density remains constant

The density decreases

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