Your student starts with a question printed right on the sheet: how does adding detergent to water affect its surface tension? The experiment uses three cups of water at different detergent concentrations, 0%, 0.1%, and 0.5%, and asks students to carefully float paper clips or a sewing needle on the surface, counting how many stay afloat before the surface gives way. A three-trial data table keeps results organized, and four analysis questions push students to explain what they observed and connect it to real-life applications. This sheet fits grades 4-7 comfortably and works well as a standalone lesson or inside a unit study on physical properties of water or chemistry of solutions.

Completing the detergent on water surface tension lab gives your homeschooler hands-on practice forming a written hypothesis, running controlled trials, recording quantitative data, and drawing evidence-based conclusions. The background section on the sheet defines surface tension clearly enough that your student can read it independently before starting, making this a strong candidate for a self-directed science block. It builds naturally into broader chemistry topics like molecular attraction, solubility, or the science of cleaning.