Equilibrium
Twelve topics on reactions that run both ways. Dynamic equilibrium and the direction set by Q versus K, calculating the equilibrium constant with ICE tables, what its magnitude means and how it transforms, solving for equilibrium concentrations, Le Chatelier’s principle, and the equilibria of solubility and the common-ion effect.
Topics
Equations For every problem in this unit
Expression
products over reactants, each raised to its coefficient (solids/liquids excluded)
Direction
Q < K shifts right; Q > K shifts left; Q = K at equilibrium
Magnitude
large K favors products; small K favors reactants (position, not speed)
ICE table
Initial, Change (in the coefficient ratio), Equilibrium
Small-x approximation
ignore x when added to a much larger number — then check it holds
Manipulating K
reverse → 1/K; scale by n → Kn; add reactions → multiply K
Le Chatelier
a stress shifts the equilibrium to partly counteract it
What changes K
temperature changes K; concentration and volume do not (and a catalyst never does)
Common-ion effect
adding a shared ion shifts toward the solid, lowering solubility
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 12 topics. Identifies which misconceptions still bite when you cannot see which topic the question came from.
20questions
12topics
19codes covered