Science labs should feel approachable, doable, and actually enjoyable—even if you don’t have a full lab setup or years of experience running experiments. I’ve taught in classrooms without sinks, with wild class periods, and with barely enough materials to go around. I know how intimidating labs can feel when the logistics seem overwhelming.
That’s why I create labs that are simple to prep, easy to run, and realistic for real classrooms—whether you’re a first-year teacher or a seasoned pro. My goal is to take the stress out of labs with this Conservation of Mass Lab so you can focus on what matters most: helping your students explore, question, and fall in love with science.
Let’s make hands-on learning possible for everyone—no fancy equipment required. You’ve got this, and I’m here to help.
In this Conservation of Mass Lab, students investigate what happens to mass during a chemical reaction by combining baking soda and vinegar in both an open and a sealed Ziploc bag. By measuring the mass before and after the reaction in each setup, students observe that mass is conserved in a closed system but appears to decrease in an open system due to gas escaping. This simple, engaging experiment helps reinforce key concepts like reactants, products, chemical change, and the importance of system boundaries in scientific investigations.
See more of this lab in action on my blog.
Ideal for grades 6–9, this resource supports classroom teachers, tutors, homeschoolers, and parents alike. It’s designed to work across a variety of instructional settings.
Everything you need is just a click away. After purchase, download the main PDF and access all linked digital resources on page 2.
Please look at the preview file to see more of this resource.
Email me at laneyleeteaches@gmail.com
