Gen Chem II - Lec 3 - Phase Change Calculations
Channel: Jeffrey A Tibbitt
Date: 2014-09-04

This lecture deals phase changes that result from heat input.  We look at the energy cost to melt a solid (heat of fusion) or boil a liquid (heat of vaporization).  We also recall from first semester the energy cost to change the temperature of a substance when no phase change occurs (specific heat capacity).  A classic example calculation is done - it involves calculating the energy cost to raise the temperature of water from -25 degrees (cold ice) up to 125 degrees (hot gas), which means that it must melt and boil along the way.  The calculation is laid out clearly, with all 5 energy terms being reported in kilojoules with the proper number of significant figures, and those terms added up to give the total heat cost.

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 - Lecture 3 - Phase Change Calculations

These videos are being made because I love teaching general chemistry.  Also, I want to provide clear videos that are captioned 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 being used to assess such students as well as hearing students. However, any student of general chemistry should find the lectures very useful.  Clear and concise explanations, colorful notes, and simple diagrams are used.  All videos are uploaded under the Creative Commons license, so please feel free to use them in any way you.

JAT 

Jeffrey A Tibbitt, Ph.D
Lecturer of Chemistry
Office PS-206, (808) 455-0264
jtibbitt@hawaii.edu
Leeward Community College
Pearl City, Hawai'i