The Consumer Challenge Project is an amazing way to put the scientific method and experimental process "to the test," by having students as a class or in groups create testable experiments driven by claims of common household products.
Includes student framing/organizational sheets, intro PowerPoint and two assignments - Proposal to Test and Consumer Challenge Conclusion paper. Rubrics included!
See examples of projects on Twitter: @CascadeSci6
Project is EDITABLE to meet your students' needs!