Density of soap and week one in physical science
Day one was a course introduction. Day two opened with an overview of the preassessment results. This chewed up too much time and didn't leave time to have the students make a density calculation. Recommendation is to drop this review in future terms. Forgotten: 500 ml water bottle. Not forgotten but almost: a kilo of sugar. Wednesday hear included two 1000 ml Erlenmeyer flasks, a recently acquired 300 ml beaker, Silka papaya soap, ruler mass balance, and the usual collection of rectangular blocks and cubes. The Silka would prove to a fail. Silka would come in at 88 grams, 2 grams under the packed mass. The lecture-demonstration followed the usual arc as seen in the board shots below. With the soap in the 300 ml beaker, water was added up to the 300 ml mark. The soap was sitting on the bottom of the beaker. Then the soap was removed. Reading the new mark was problematic. With a habit of overestimating volume, the error wa...