Phase diagrams are graphical representations of the phases a substance takes on under different temperature/pressure conditions. In this lecture, we first reiterate our basic understanding of the 3 phases of matter (solid, liquid, gas), as well as the 6 possible phase transitions that can occur (melting, freezing, vaporization, condensation, sublimation, deposit). We then describe what the phase diagram of a general substance tells us (regions represent phases and lines represent phase transitions), and we also indicate the normal melting and boiling points, as well as the point triple and the critical point. We then compare the phase diagrams of water and carbon dioxide.

The intro is filmed on location at the entrance to Laniakea overlooking Kailua Bay in Kailua, HI.

For your convenience, here are links to slides, transcripts and captions:

Video slides located here:
https://drive.google.com/drive/folders/1n3VgakdvpkIdSYQONz4hddqmhCeD9PwG?usp=sharing

Video transcripts located here:
https://drive.google.com/drive/folders/1-z67YL65Z36_nIU2r12JIXgzcaAeVan8?usp=sharing

Video captions located here:
https://drive.google.com/drive/folders/1VmiJHEDfNwsi1UXNyH_dDgqwtnUFcTg7?usp=sharing

General Chemistry II – Course 5 – Phase Changes II – Phase Diagrams

These videos are made because I enjoy teaching general chemistry. In addition, I want to provide clear, subtitled videos for the deaf and hard of hearing, as well as for international students who use English as a second language (ESL). These video lectures are used to assess these students as well as hearing students. However, any general chemistry student should find the courses very useful. Clear and concise explanations, colorful notes and simple diagrams are used. All videos are uploaded under the Creative Commons license, so feel free to use them however you wish.

These videos require a lot of work on my part and I enjoy making them. If you continue watching, you will learn not only chemistry, but also interesting things about the state of Hawaii. Each video normally begins with a short clip filmed on location somewhere in the Hawaiian Islands. And if you're on or visiting O'ahu, be sure to stop by Leeward Community College and say hello.
Enjoy and Aloha!!!

JIT

Jeffrey A Tibbitt, Ph.D.
Lecturer in chemistry
Office PS-206, (808) 455-0264
[email protected]
Leeward Community College
Pearl City, Hawaii

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