Students use samples of various metals, a digital scale, and Archimedes' Principle to measure the mass and volume of each sample. Afterwards, they calculate density of the metal according to the equation d=m/v. Lastly, they calculate percent error of their calculations using standard densities (provided).
My labs are straightforward. Some of them are paper labs, but the ones that involve significant laboratory setup or calculations to be made on the part of the teacher are written about in a Teacher Notes section at the end of those particular labs. I use relatively safe and inexpensive chemicals. Of course, safety precautions are always noted at the beginning of the lab.
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Science Education by Joshua Wickline is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 United States License