A P C H E M I S T RY A C T I V E S T U D Y W O R K B O O K
Chemical
Equilibrium
Learn it. Predict it. Prove it.
A student-friendly guide to dynamic equilibrium, K and Q, Le Chatelier's
principle, RICE tables, Kp, and the 5% rule.
How to use this guide
1. Learn 2. Predict 3. Correct
Read the concept boxes and Commit to a shift before Mark every miss and explain
cover the bold terms. checking the rule. why it happened.
Name Class / period Test date
Equilibrium does not mean “equal amounts.” It means equal rates.
AP Chemistry • Chemical equilibrium 1
, 01 • FOUNDATIONS DYNAMIC EQUILIBRIUM
Equilibrium is movement without net change
A+B⇌C+D
Forward reaction Reverse reaction
Reactants form products. Products form reactants.
At chemical equilibrium, the forward and reverse reactions continue, but they occur at the same rate. Because
the rates match, concentrations remain constant over time and there is no observable net change.
Core distinction: Constant concentration does not mean equal concentration. A system can contain much
more product than reactant and still be at equilibrium.
Six facts to know cold
Forward rate = reverse rate. No observable net change occurs.
Both reactions continue. Amounts do not need to be equal.
Concentrations stay constant. Equilibrium can be reached from either direction.
Stop-and-check: true or false?
At equilibrium, the reaction has stopped.
Reactant and product concentrations remain constant.
Product concentration must equal reactant concentration.
The forward and reverse rates are equal.
Correct pattern: False, True, False, True.
Explain it in one sentence
Why is equilibrium called dynamic?
Active study: say the definition without looking 2
Chemical
Equilibrium
Learn it. Predict it. Prove it.
A student-friendly guide to dynamic equilibrium, K and Q, Le Chatelier's
principle, RICE tables, Kp, and the 5% rule.
How to use this guide
1. Learn 2. Predict 3. Correct
Read the concept boxes and Commit to a shift before Mark every miss and explain
cover the bold terms. checking the rule. why it happened.
Name Class / period Test date
Equilibrium does not mean “equal amounts.” It means equal rates.
AP Chemistry • Chemical equilibrium 1
, 01 • FOUNDATIONS DYNAMIC EQUILIBRIUM
Equilibrium is movement without net change
A+B⇌C+D
Forward reaction Reverse reaction
Reactants form products. Products form reactants.
At chemical equilibrium, the forward and reverse reactions continue, but they occur at the same rate. Because
the rates match, concentrations remain constant over time and there is no observable net change.
Core distinction: Constant concentration does not mean equal concentration. A system can contain much
more product than reactant and still be at equilibrium.
Six facts to know cold
Forward rate = reverse rate. No observable net change occurs.
Both reactions continue. Amounts do not need to be equal.
Concentrations stay constant. Equilibrium can be reached from either direction.
Stop-and-check: true or false?
At equilibrium, the reaction has stopped.
Reactant and product concentrations remain constant.
Product concentration must equal reactant concentration.
The forward and reverse rates are equal.
Correct pattern: False, True, False, True.
Explain it in one sentence
Why is equilibrium called dynamic?
Active study: say the definition without looking 2
