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

7.1

Introduction to Equilibrium

Direction of Reversible Reactions

Reaction Quotient and Equilibrium Constant

Calculating the Equilibrium Constant

Magnitude of the Equilibrium Constant

Properties of the Equilibrium Constant

Calculating Equilibrium Concentrations

Representations of Equilibrium

Introduction to Le Chatelier's Principle

Reaction Quotient and Le Chatelier's Principle

Introduction to Solubility Equilibria

Common-Ion Effect

Lesson

Diagnostic

after diagnostic

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 7 tools

Challenge bank

1 / 60

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

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.

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Check what stuck.

Units 1 through 7, 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.

20 or 60questions

69topics

121codes covered

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