Students learn about material balances, a fundamental concept of chemical engineering. They use stoichiometry to predict the mass of carbon dioxide that escapes after reacting measured quantities of sodium bicarbonate with dilute acetic acid. Students then produce the reactions of the chemicals in a small reactor made from a plastic water bottle and balloon.

Lesson length: 2-4 hoursGrade level: 6-8Students learn about DNA and genetics through an exploration of corn genetics and soil types. The activities are grounded in engineering design thinking and relate to nutrient impacts of soil on the productive growing of corn with specific genetic characteristics. Students will consider genetic modification to address deficiencies as well as the consequences of these options.This material is based upon work supported by the National Science Foundation under Grant No. 1657263. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.