The project revolves around the energy produced in various types of chemical reactions (a key concept in all chemistry classes) and asks students to propose a useful source of chemical energy after engaging in a series of hands-on experiments and online activities. I appreciate how this project not only requires students to think deeply about their experimental results, but also how it asks them to apply them in a new context. Students not only collect and analyze data, they must seek a useful purpose or application of their results, giving the project real-world relevance.
PBL works has a very nice site, but they are much more interested in middle and elementary school, than high school. I like Teach Engineering. I look a PBL class this school year from a company that creates PBL units and even they are really light on chemistry and physics for upper grades.