Your homeschooler compares three to four hand sanitizers against a no-sanitizer control by swabbing hands onto labeled nutrient agar plates and counting bacterial colonies over three consecutive days. The results table tracks Day 1, Day 2, and Day 3 colony counts plus a three-day average for each plate, giving students a concrete, visual answer to which sanitizer reduces germs most. Designed for grades 5-8, the hand sanitizer effectiveness lab sheet walks students through forming a written hypothesis before testing and guides them through four analysis questions at the end.

This experiment fits naturally into a unit study on microbiology, hygiene science, or consumer product testing and works as a standalone multi-day investigation without needing prior lab experience. A built-in challenge section asks students to formulate a homemade sanitizer recipe and run it against the store-bought options, extending the experiment by several more days if you want to push further. Completing the sheet demonstrates a student’s ability to control variables, track quantitative data across time, and draw evidence-based conclusions.