If this isn't the video you need there are lots more at brightstorm.com
They have math, chemistry, and physics that I have used. Great way to study if you learn by listening! There are videos that would help in 3 different units at brightstorm.  Check out "Introduction to Chemistry", "Matter", and even the phase change video in "Kinetic Molecular Theory." The KMT videos are a bit more detailed than you need right now, but there is a good explanation of our heating curve graph.