Engage students in the study of density by rewarding them with free brownies after a hard day's work. This lab sheet has all you need to run a full investigation into the property of density as a relationship (ratio) between mass and volume. I have often found that students do not readily understand that the density of objects do not change despite a change in size. This brownie lab allows students to independently discover this relationship while gaining practice in measuring the density of solid objects.
-- I use "Little Debbie Cosmic Brownies" (I provided 1 package per 2 students)
-- Metric rulers
-- Triple beam balance / balance used to measure grams
-- Lab sheet
I prefer to use the cosmic brownies because the mass and volume measurements are fairly consistent among all brownies. The various candy toppings are assumed to be negated when averaging all brownie densities. As an added bonus, each package is individually wrapped, which prevents students from spreading germs. I allow my students to share and eat their brownies as the conclusion of the lesson. My assistant principal was impressed and even requested a brownie for herself :)
This is a zipped package file containing a fully editable lab sheet (2 sides) and fully editable powerpoint (14 slides).