Physical Science 20 - Nov 20

Today we went over Assignment HT1 and then learned what happens to heat during when phase changes.  What students need to remember is that phase changes occur without a change in temperature.  This means to calculate the heat required to change a phase of matter, we need to use a different relationship than we used for temperature changes.  Two new formulas were introduced on the heats of fusion and the heats of vaporization.  This was covered on slides 12-19.  We then had the rest of class to work on Assignment HT2.  We will go over this tomorrow.