Properties of Substances and Mixtures
Thirteen topics on how particles interact and what those interactions produce. Intermolecular forces and the states of matter they hold together, the ideal gas law and the kinetic theory behind it, why real gases deviate, solutions and solubility, how mixtures are separated, and the spectroscopy that reads matter with light.
Equations For every problem in this unit
60 open-ended problems.
Read the question, work it out, then flip the card to compare your reasoning to the worked solution. Mark each card so you can return to the ones that still bite.
Switch to All, work through some cards, and tag them as Got it or Revisit.
Test the unit.
Twenty mixed items pulled from across all 13 topics. Identifies which misconceptions still bite when you cannot see which topic the question came from.
Check what stuck.
Units 1 through 3, drawn evenly so earlier units get the same share as this one. Twenty questions or a full 60-question section, your choice. Even coverage means this is a retention check rather than a score estimate.