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.
Topics
Equations For every problem in this unit
Balancing
same count of every atom on both sides
Dissociate
split only strong, soluble electrolytes into ions
Net ionic
cancel spectator ions (unchanged on both sides)
Mole ratio
the balanced coefficients (convert grams to moles first)
Limiting reactant
the reactant that makes the least product
Titration equivalence
moles of titrant and analyte match the stoichiometric ratio
Acid-base
proton (H+) transfer, donor to acceptor
Precipitation
ions combine into an insoluble solid
Redox
electron transfer; oxidation states change
Unit 1 tools
Challenge bank
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.
Question
Tap card to reveal explanation
Worked solution
Tap card to return to question
Nothing here yet.
Switch to All, work through some cards, and tag them as Got it or Revisit.
Cumulative assessment
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.
20questions
9topics
20codes covered