Many of the things people make — from concrete to bread — undergo physical and chemical changes during production. While making bread, students will learn more about the differences between chemical and physical changes and how the two are related.
The multitalented Louis Pasteur was a chemist, biologist, the father of microbiology and the inventor of pasteurization. In this hands-on lab, students will learn about Pasteur’s contributions by conducting an inquiry-based yeast fermentation experiment that explores the concept of pasteurization. In this experiment, students will observe, calculate and graph the volume of carbon dioxide produced by yeast during fermentation at different temperatures and identify the point where the yeast have been killed and pasteurization occurs.
Students will answer questions about the online Science News article “If bacteria band together, they can survive for years in space,” which describes an experiment on the International Space Station that suggests microbes are capable of surviving interplanetary travel. A version of the story, “Bacteria can survive for years in space,” can be found in the September 26, 2020 issue of Science News.
In this guide, students will learn about bacterial communities on the human tongue and use existing knowledge of interspecific interactions to create metaphors about relationships in the students’ own communities. In an activity, students will practice note-taking and summarizing skills.
Students will answer questions about the online Science News article “Here’s where bacteria live on your tongue cells,” which maps how bacteria build communities on human cells. A version of the story, “Where bacteria live on our tongues,” can be found in the April 25, 2020 issue of Science News.