Chemical Reactions
Nine topics on how substances change and how we track it. Telling chemical from physical change, writing balanced and net ionic equations, representing a reaction across three levels, the stoichiometry of limiting reactants, titration, and the big reaction families: acid-base and redox.
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 9 topics. Identifies which misconceptions still bite when you cannot see which topic the question came from.
Check what stuck.
Units 1 through 4, 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.