Rube Goldberg Challenge (Juniors Only)

Challenge
Build a Rube Goldberg machine, that will accomplish a task related to something we learned this year in AP Chemistry.
Rules
Your machine must consist of at least five, unique energy transfers (steps). A human being may initiate the process, but can not contribute to any of the five energy transfers.
Materials
You may use any materials in class, at SHCP, or brought from home. You will be given a location in room 206 where you will build your machine.
Grade
This project will count as your final exam. Grading scale below:
- 10/10: Five unique energy transfers & successful chemistry task.
- 9/10: < Five unique energy transfers & successful chemistry task.
- 8/10:< Five unique energy transfers & partially successful chemistry task.
- 7/10: < Five unique energy transfer & unsuccessful chemistry task.
- 6/10: Machine doesn't work, and/or no video provided.
- 5/10: Missing.
In the space below, copy and past the URL to a video of your machine performing its task from start to finish. The video must conclude with a whiteboard explanation of the chemistry behind the task. Your explanation must use chemical symbols, spoken and written word to explain the task. This can be done by zooming in on a whiteboard while one member explains the concept.
Examples
*Note: the below videos do not involve chemistry specific tasks, but should give you a good idea of what a Rube Goldberg Machine looks like:
Practice Tests
Unit 1: Molarity / Solutions
Unit 2: Reactions / Solutions
Unit 3: The Atom
Unit 4: Bonding / Solutions
Unit 5: Gases
Semester 1 Review Problems
Semester 1 Solutions (doc)
Semester 1 Review (vids)
Unit 6: Thermo / Solutions
Unit 7: Kinetics / Solutions
Unit 8: Equilibrium
Unit 9: Electrochem
Unit 10: AP Review (Pre Break)
Unit 10: AP Review (Post Break)
Unit 10: AP Review Packet
Unit 10: AP Review (Mock Test)