30 scenario-based questions in which students classify molecules, surfaces, and biological structures as Hydrophilic (polar or charged, interacting favorably with water) or Hydrophobic (nonpolar, avoiding water). For AP Biology and chemistry courses. Use as a bell ringer, exit ticket, unit review, sub plan, homework, or test prep activity for the the water chemistry and cell membrane unit. No more printing or correcting, in an LMS it corrects itself! No more passing out the papers, or collec