This engaging, hands-on lab will help your students to understand the law of conservation of mass, and can be done as an inquiry lab or as a traditional (post-instruction) lab.
Students perform three experiments: one physical change, one precipitation reaction, and one gas-forming reaction. In the first two experiments students find that mass is conserved, but in the gas-forming experiment it appears that mass is not conserved. Students are challenged to explain their observations.
This is also a great lab for challenging the deeply ingrained misconception that gases do not have mass!
-beakers or plastic cups
The product preview shows the first two pages of the student lab, as well as some of the Analysis questions after the lab.