This laboratory experiment is sure to become a student favorite, as they use their chemistry knowledge of the colligative property, freezing point depression, to prepare ice cream that they get to eat! While they conduct the experiment, they will review several concepts pertaining to solutions: solvent and solute; saturated, unsaturated, and supersaturated solutions; dilute and concentrated solutions; the four colligative properties; data collection; and some general laboratory techniques. Students will be amazed to see milk, sugar and flavoring turn into delicious ice cream that some of my students claimed was the best they ever ate - - and all while they are crystallizing concepts such as those listed above.
I have used this experiment as a laboratory assessment with middle school students, as well as high school students. It can be used in a high school chemistry class or in a lower level high school or middle school physical science class. I used it earlier this year with my 8th graders who enjoyed the experience, while reviewing key concepts they had already been taught in class. This lab experiment could also be used as a teacher demonstration, while students write down data and observations on the sheets provided.
The document also provides 5 questions that students can answer for homework or as part of a formal lab report. Answers to these 5 questions are also provided. I usually have students submit in a 2-person (or solo) formal lab report for this experiment, and this document lists the parts of the report. Also included is a sample Conclusion Paragraph that I require my students to include in their report.
Dr.Ronald Occhiogrosso, DrOs Science Stuff Store